* Copyright (c) 1988, 1989, 1990, 1993

/* $NetBSD: main.c,v 1.659 2025/06/13 05:41:36 rillig Exp $ */

/*
* Copyright (c) 1988, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/*
* Copyright (c) 1989 by Berkeley Softworks
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/*
* The main file for this entire program. Exit routines etc. reside here.
*
* Utility functions defined in this file:
*
* Main_ParseArgLine
* Parse and process command line arguments from a
* single string. Used to implement the special targets
* .MFLAGS and .MAKEFLAGS.
*
* Error Print a tagged error message.
*
* Fatal Print an error message and exit.
*
* Punt Abort all jobs and exit with a message.
*/

#include <sys/types.h>
#include <sys/time.h>
#include <sys/param.h>
#include <sys/resource.h>
#include <sys/stat.h>
#ifdef MAKE_NATIVE
#include <sys/sysctl.h>
#endif
#include <sys/utsname.h>
#include <sys/wait.h>

#include <errno.h>
#include <signal.h>
#include <stdarg.h>
#include <time.h>

#include "make.h"
#include "dir.h"
#include "job.h"
#ifdef USE_META
# include "meta.h"
#endif
#include "pathnames.h"
#include "trace.h"

/* "@(#)main.c 8.3 (Berkeley) 3/19/94" */
MAKE_RCSID("$NetBSD: main.c,v 1.659 2025/06/13 05:41:36 rillig Exp $");
#if defined(MAKE_NATIVE)
__COPYRIGHT("@(#) Copyright (c) 1988, 1989, 1990, 1993 "
"The Regents of the University of California. "
"All rights reserved.");
#endif

CmdOpts opts;
time_t now; /* Time at start of make */
GNode *defaultNode; /* .DEFAULT node */
bool allPrecious; /* .PRECIOUS given on a line by itself */
bool deleteOnError; /* .DELETE_ON_ERROR: set */

static int maxJobTokens; /* -j argument */
static bool enterFlagObj; /* -w and objdir != srcdir */
static bool bogusJflag; /* -J invalid */

static int tokenPoolReader = -1, tokenPoolWriter = -1;
bool doing_depend; /* Set while reading .depend */
static bool jobsRunning; /* true if the jobs might be running */
static const char *tracefile;
static bool ReadMakefile(const char *);
static void purge_relative_cached_realpaths(void);

static bool ignorePWD; /* if we use -C, PWD is meaningless */
static char objdir[MAXPATHLEN + 1]; /* where we chdir'ed to */
char curdir[MAXPATHLEN + 1]; /* Startup directory */
const char *progname;
char *makeDependfile;
pid_t myPid;
int makelevel;

bool forceJobs = false;
static int main_errors = 0;
static HashTable cached_realpaths;

/*
* For compatibility with the POSIX version of MAKEFLAGS that includes
* all the options without '-', convert 'flags' to '-f -l -a -g -s '.
*/
static char *
explode(const char *flags)
{
char *exploded, *ep;
const char *p;

if (flags == NULL)
return NULL;

for (p = flags; *p != '\0'; p++)
if (!ch_isalpha(*p))
return bmake_strdup(flags);

exploded = bmake_malloc((size_t)(p - flags) * 3 + 1);
for (p = flags, ep = exploded; *p != '\0'; p++) {
*ep++ = '-';
*ep++ = *p;
*ep++ = ' ';
}
*ep = '\0';
return exploded;
}

MAKE_ATTR_DEAD static void
usage(void)
{
size_t prognameLen = strcspn(progname, "[");

(void)fprintf(stderr,
"usage: %.*s [-BeikNnqrSstWwX]\n"
" [-C directory] [-D variable] [-d flags] [-f makefile]\n"
" [-I directory] [-J private] [-j max_jobs] [-m directory] [-T file]\n"
" [-V variable] [-v variable] [variable=value] [target ...]\n",
(int)prognameLen, progname);
exit(2);
}

static void
MainParseArgDebugFile(const char *arg)
{
const char *mode;
size_t len;
char *fname;

if (opts.debug_file != stdout && opts.debug_file != stderr)
fclose(opts.debug_file);

if (*arg == '+') {
arg++;
mode = "a";
} else
mode = "w";

if (strcmp(arg, "stdout") == 0) {
opts.debug_file = stdout;
return;
}
if (strcmp(arg, "stderr") == 0) {
opts.debug_file = stderr;
return;
}

len = strlen(arg);
fname = bmake_malloc(len + 20);
memcpy(fname, arg, len + 1);

/* Replace the trailing '%d' after '.%d' with the pid. */
if (len >= 3 && memcmp(fname + len - 3, ".%d", 3) == 0)
snprintf(fname + len - 2, 20, "%d", getpid());

opts.debug_file = fopen(fname, mode);
if (opts.debug_file == NULL) {
fprintf(stderr, "Cannot open debug file \"%s\"\n", fname);
exit(2);
}
free(fname);
}

static void
MainParseArgDebug(const char *argvalue)
{
const char *modules;
DebugFlags debug = opts.debug;

for (modules = argvalue; *modules != '\0'; modules++) {
switch (*modules) {
case '0': /* undocumented, only intended for tests */
memset(&debug, 0, sizeof(debug));
break;
case 'A':
memset(&debug, ~0, sizeof(debug));
break;
case 'a':
debug.DEBUG_ARCH = true;
break;
case 'C':
debug.DEBUG_CWD = true;
break;
case 'c':
debug.DEBUG_COND = true;
break;
case 'd':
debug.DEBUG_DIR = true;
break;
case 'e':
debug.DEBUG_ERROR = true;
break;
case 'f':
debug.DEBUG_FOR = true;
break;
case 'g':
if (modules[1] == '1') {
debug.DEBUG_GRAPH1 = true;
modules++;
} else if (modules[1] == '2') {
debug.DEBUG_GRAPH2 = true;
modules++;
} else if (modules[1] == '3') {
debug.DEBUG_GRAPH3 = true;
modules++;
}
break;
case 'h':
debug.DEBUG_HASH = true;
break;
case 'j':
debug.DEBUG_JOB = true;
break;
case 'L':
opts.strict = true;
break;
case 'l':
debug.DEBUG_LOUD = true;
break;
case 'M':
debug.DEBUG_META = true;
break;
case 'm':
debug.DEBUG_MAKE = true;
break;
case 'n':
debug.DEBUG_SCRIPT = true;
break;
case 'p':
debug.DEBUG_PARSE = true;
break;
case 's':
debug.DEBUG_SUFF = true;
break;
case 't':
debug.DEBUG_TARG = true;
break;
case 'V':
opts.debugVflag = true;
break;
case 'v':
debug.DEBUG_VAR = true;
break;
case 'x':
debug.DEBUG_SHELL = true;
break;
case 'F':
MainParseArgDebugFile(modules + 1);
goto finish;
default:
(void)fprintf(stderr,
"%s: illegal argument to d option -- %c\n",
progname, *modules);
usage();
}
}

finish:
opts.debug = debug;

setvbuf(opts.debug_file, NULL, _IONBF, 0);
if (opts.debug_file != stdout)
setvbuf(stdout, NULL, _IOLBF, 0);
}

/* Is path relative or does it contain any relative component "." or ".."? */
static bool
IsRelativePath(const char *path)
{
const char *p;

if (path[0] != '/')
return true;
p = path;
while ((p = strstr(p, "/.")) != NULL) {
p += 2;
if (*p == '.')
p++;
if (*p == '/' || *p == '\0')
return true;
}
return false;
}

static void
MainParseArgChdir(const char *argvalue)
{
struct stat sa, sb;

if (chdir(argvalue) == -1) {
(void)fprintf(stderr, "%s: chdir %s: %s\n",
progname, argvalue, strerror(errno));
exit(2); /* Not 1 so -q can distinguish error */
}
if (getcwd(curdir, MAXPATHLEN) == NULL) {
(void)fprintf(stderr, "%s: getcwd: %s\n",
progname, strerror(errno));
exit(2);
}
if (!IsRelativePath(argvalue) &&
stat(argvalue, &sa) != -1 &&
stat(curdir, &sb) != -1 &&
sa.st_ino == sb.st_ino &&
sa.st_dev == sb.st_dev)
snprintf(curdir, MAXPATHLEN, "%s", argvalue);
ignorePWD = true;
}

static void
MainParseArgJobsInternal(const char *argvalue)
{
char end;
if (sscanf(argvalue, "%d,%d%c",
&tokenPoolReader, &tokenPoolWriter, &end) != 2) {
(void)fprintf(stderr,
"%s: error: invalid internal option "
"\"-J %s\" in \"%s\"\n",
progname, argvalue, curdir);
exit(2);
}
if ((fcntl(tokenPoolReader, F_GETFD, 0) < 0) ||
(fcntl(tokenPoolWriter, F_GETFD, 0) < 0)) {
tokenPoolReader = -1;
tokenPoolWriter = -1;
bogusJflag = true;
} else {
Global_Append(MAKEFLAGS, "-J");
Global_Append(MAKEFLAGS, argvalue);
}
}

static void
MainParseArgJobs(const char *arg)
{
const char *p;
char *end;
char v[12];

forceJobs = true;
opts.maxJobs = (int)strtol(arg, &end, 0);
p = end;
#ifdef _SC_NPROCESSORS_ONLN
if (*p != '\0') {
double d;

if (*p == 'C')
d = (opts.maxJobs > 0) ? opts.maxJobs : 1;
else if (*p == '.') {
d = strtod(arg, &end);
p = end;
} else
d = 0.0;
if (d > 0.0) {
p = "";
opts.maxJobs = (int)sysconf(_SC_NPROCESSORS_ONLN);
opts.maxJobs = (int)(d * (double)opts.maxJobs);
}
}
#endif
if (*p != '\0' || opts.maxJobs < 1) {
(void)fprintf(stderr,
"%s: argument '%s' to option '-j' "
"must be a positive number\n",
progname, arg);
exit(2); /* Not 1 so -q can distinguish error */
}
snprintf(v, sizeof(v), "%d", opts.maxJobs);
Global_Append(MAKEFLAGS, "-j");
Global_Append(MAKEFLAGS, v);
Global_Set(".MAKE.JOBS", v);
maxJobTokens = opts.maxJobs;
}

static void
MainParseArgSysInc(const char *argvalue)
{
if (strncmp(argvalue, ".../", 4) == 0) {
char *found_path = Dir_FindHereOrAbove(curdir, argvalue + 4);
if (found_path == NULL)
return;
(void)SearchPath_Add(sysIncPath, found_path);
free(found_path);
} else {
(void)SearchPath_Add(sysIncPath, argvalue);
}
Global_Append(MAKEFLAGS, "-m");
Global_Append(MAKEFLAGS, argvalue);
Dir_SetSYSPATH();
}

static bool
MainParseOption(char c, const char *argvalue)
{
switch (c) {
case '\0':
break;
case 'B':
opts.compatMake = true;
Global_Append(MAKEFLAGS, "-B");
Global_Set(".MAKE.MODE", "compat");
break;
case 'C':
MainParseArgChdir(argvalue);
break;
case 'D':
if (argvalue[0] == '\0')
return false;
Var_SetExpand(SCOPE_GLOBAL, argvalue, "1");
Global_Append(MAKEFLAGS, "-D");
Global_Append(MAKEFLAGS, argvalue);
break;
case 'I':
SearchPath_Add(parseIncPath, argvalue);
Global_Append(MAKEFLAGS, "-I");
Global_Append(MAKEFLAGS, argvalue);
break;
case 'J':
MainParseArgJobsInternal(argvalue);
break;
case 'N':
opts.noExecute = true;
opts.noRecursiveExecute = true;
Global_Append(MAKEFLAGS, "-N");
break;
case 'S':
opts.keepgoing = false;
Global_Append(MAKEFLAGS, "-S");
break;
case 'T':
tracefile = bmake_strdup(argvalue);
Global_Append(MAKEFLAGS, "-T");
Global_Append(MAKEFLAGS, argvalue);
break;
case 'V':
case 'v':
opts.printVars = c == 'v' ? PVM_EXPANDED : PVM_UNEXPANDED;
Lst_Append(&opts.variables, bmake_strdup(argvalue));
/* XXX: Why always -V? */
Global_Append(MAKEFLAGS, "-V");
Global_Append(MAKEFLAGS, argvalue);
break;
case 'W':
opts.parseWarnFatal = true;
/* XXX: why no Global_Append? */
break;
case 'X':
opts.varNoExportEnv = true;
Global_Append(MAKEFLAGS, "-X");
break;
case 'd':
/* If '-d-opts' don't pass to children */
if (argvalue[0] == '-')
argvalue++;
else {
Global_Append(MAKEFLAGS, "-d");
Global_Append(MAKEFLAGS, argvalue);
}
MainParseArgDebug(argvalue);
break;
case 'e':
opts.checkEnvFirst = true;
Global_Append(MAKEFLAGS, "-e");
break;
case 'f':
Lst_Append(&opts.makefiles, bmake_strdup(argvalue));
break;
case 'i':
opts.ignoreErrors = true;
Global_Append(MAKEFLAGS, "-i");
break;
case 'j':
MainParseArgJobs(argvalue);
break;
case 'k':
opts.keepgoing = true;
Global_Append(MAKEFLAGS, "-k");
break;
case 'm':
MainParseArgSysInc(argvalue);
/* XXX: why no Var_Append? */
break;
case 'n':
opts.noExecute = true;
Global_Append(MAKEFLAGS, "-n");
break;
case 'q':
opts.query = true;
/* Kind of nonsensical, wot? */
Global_Append(MAKEFLAGS, "-q");
break;
case 'r':
opts.noBuiltins = true;
Global_Append(MAKEFLAGS, "-r");
break;
case 's':
opts.silent = true;
Global_Append(MAKEFLAGS, "-s");
break;
case 't':
opts.touch = true;
Global_Append(MAKEFLAGS, "-t");
break;
case 'w':
opts.enterFlag = true;
Global_Append(MAKEFLAGS, "-w");
break;
default:
usage();
}
return true;
}

/*
* Parse the given arguments. Called from main() and from
* Main_ParseArgLine() when the .MAKEFLAGS target is used.
*
* The arguments must be treated as read-only and will be freed after the
* call.
*
* XXX: Deal with command line overriding .MAKEFLAGS in makefile
*/
static void
MainParseArgs(int argc, char **argv)
{
char c;
int arginc;
char *argvalue;
char *optscan;
bool inOption, dashDash = false;

const char *optspecs = "BC:D:I:J:NST:V:WXd:ef:ij:km:nqrstv:w";
/* Can't actually use getopt(3) because rescanning is not portable */

rearg:
inOption = false;
optscan = NULL;
while (argc > 1) {
const char *optspec;
if (!inOption)
optscan = argv[1];
c = *optscan++;
arginc = 0;
if (inOption) {
if (c == '\0') {
argv++;
argc--;
inOption = false;
continue;
}
} else {
if (c != '-' || dashDash)
break;
inOption = true;
c = *optscan++;
}
/* '-' found at some earlier point */
optspec = strchr(optspecs, c);
if (c != '\0' && optspec != NULL && optspec[1] == ':') {
/*
* -<something> found, and <something> should have an
* argument
*/
inOption = false;
arginc = 1;
argvalue = optscan;
if (*argvalue == '\0') {
if (argc < 3)
goto noarg;
argvalue = argv[2];
arginc = 2;
}
} else {
argvalue = NULL;
}
switch (c) {
case '\0':
arginc = 1;
inOption = false;
break;
case '-':
dashDash = true;
break;
default:
if (!MainParseOption(c, argvalue))
goto noarg;
}
argv += arginc;
argc -= arginc;
}

/*
* See if the rest of the arguments are variable assignments and
* perform them if so. Else take them to be targets and stuff them
* on the end of the "create" list.
*/
for (; argc > 1; argv++, argc--) {
if (!Parse_VarAssign(argv[1], false, SCOPE_CMDLINE)) {
if (argv[1][0] == '\0')
Punt("illegal (null) argument.");
if (argv[1][0] == '-' && !dashDash)
goto rearg;
Lst_Append(&opts.create, bmake_strdup(argv[1]));
}
}

return;
noarg:
(void)fprintf(stderr, "%s: option requires an argument -- %c\n",
progname, c);
usage();
}

/*
* Break a line of arguments into words and parse them.
*
* Used when a .MFLAGS or .MAKEFLAGS target is encountered during parsing and
* by main() when reading the MAKEFLAGS environment variable.
*/
void
Main_ParseArgLine(const char *line)
{
Words words;
char *buf;
const char *p;

if (line == NULL)
return;
for (p = line; *p == ' '; p++)
continue;
if (p[0] == '\0')
return;

{
FStr argv0 = Var_Value(SCOPE_GLOBAL, ".MAKE");
buf = str_concat3(argv0.str, " ", p);
FStr_Done(&argv0);
}

words = Str_Words(buf, true);
if (words.words == NULL) {
Error("Unterminated quoted string [%s]", buf);
free(buf);
return;
}
free(buf);
EvalStack_PushMakeflags(line);
MainParseArgs((int)words.len, words.words);
EvalStack_Pop();

Words_Free(words);
}

bool
Main_SetObjdir(bool writable, const char *fmt, ...)
{
struct stat sb;
char *path;
char buf[MAXPATHLEN + 1];
char buf2[MAXPATHLEN + 1];
va_list ap;

va_start(ap, fmt);
vsnprintf(path = buf, MAXPATHLEN, fmt, ap);
va_end(ap);

if (path[0] != '/') {
if (snprintf(buf2, MAXPATHLEN, "%s/%s", curdir, path) <= MAXPATHLEN)
path = buf2;
else
return false;
}

/* look for the directory and try to chdir there */
if (stat(path, &sb) != 0 || !S_ISDIR(sb.st_mode))
return false;

if ((writable && access(path, W_OK) != 0) || chdir(path) != 0) {
(void)fprintf(stderr, "%s: warning: %s: %s\n",
progname, path, strerror(errno));
/* Allow debugging how we got here - not always obvious */
if (GetBooleanExpr("${MAKE_DEBUG_OBJDIR_CHECK_WRITABLE}",
false))
PrintOnError(NULL, "");
return false;
}

snprintf(objdir, sizeof objdir, "%s", path);
Global_Set(".OBJDIR", objdir);
setenv("PWD", objdir, 1);
Dir_InitDot();
purge_relative_cached_realpaths();
if (opts.enterFlag && strcmp(objdir, curdir) != 0)
enterFlagObj = true;
return true;
}

static bool
SetVarObjdir(bool writable, const char *var, const char *suffix)
{
FStr path = Var_Value(SCOPE_CMDLINE, var);

if (path.str == NULL || path.str[0] == '\0') {
FStr_Done(&path);
return false;
}

Var_Expand(&path, SCOPE_GLOBAL, VARE_EVAL);

(void)Main_SetObjdir(writable, "%s%s", path.str, suffix);

FStr_Done(&path);
return true;
}

/*
* Splits str into words (in-place, modifying it), adding them to the list.
* The string must be kept alive as long as the list.
*/
void
AppendWords(StringList *lp, char *str)
{
char *p;
const char *sep = " \t";

for (p = strtok(str, sep); p != NULL; p = strtok(NULL, sep))
Lst_Append(lp, p);
}

#ifdef SIGINFO
static void
siginfo(int signo MAKE_ATTR_UNUSED)
{
char dir[MAXPATHLEN];
char str[2 * MAXPATHLEN];
int len;
if (getcwd(dir, sizeof dir) == NULL)
return;
len = snprintf(str, sizeof str, "%s: Working in: %s\n", progname, dir);
if (len > 0)
(void)write(STDERR_FILENO, str, (size_t)len);
}
#endif

/* Allow makefiles some control over the mode we run in. */
static void
MakeMode(void)
{
char *mode = Var_Subst("${.MAKE.MODE:tl}", SCOPE_GLOBAL, VARE_EVAL);
/* TODO: handle errors */

if (mode[0] != '\0') {
if (strstr(mode, "compat") != NULL) {
opts.compatMake = true;
forceJobs = false;
}
#if USE_META
if (strstr(mode, "meta") != NULL)
meta_mode_init(mode);
#endif
if (strstr(mode, "randomize-targets") != NULL)
opts.randomizeTargets = true;
}

free(mode);
}

static void
PrintVariable(const char *varname, bool expandVars)
{
if (strchr(varname, '$') != NULL) {
char *evalue = Var_Subst(varname, SCOPE_GLOBAL, VARE_EVAL);
/* TODO: handle errors */
printf("%s\n", evalue);
free(evalue);

} else if (expandVars) {
char *expr = str_concat3("${", varname, "}");
char *evalue = Var_Subst(expr, SCOPE_GLOBAL, VARE_EVAL);
/* TODO: handle errors */
free(expr);
printf("%s\n", evalue);
free(evalue);

} else {
FStr value = Var_Value(SCOPE_GLOBAL, varname);
printf("%s\n", value.str != NULL ? value.str : "");
FStr_Done(&value);
}
}

/*
* Return a bool based on a variable.
*
* If the knob is not set, return the fallback.
* If set, anything that looks or smells like "No", "False", "Off", "0", etc.
* is false, otherwise true.
*/
bool
GetBooleanExpr(const char *expr, bool fallback)
{
char *value;
bool res;

value = Var_Subst(expr, SCOPE_GLOBAL, VARE_EVAL);
/* TODO: handle errors */
res = ParseBoolean(value, fallback);
free(value);
return res;
}

static void
PrintVariables(void)
{
StringListNode *ln;
bool expandVars;

if (opts.printVars == PVM_EXPANDED)
expandVars = true;
else if (opts.debugVflag)
expandVars = false;
else
expandVars = GetBooleanExpr("${.MAKE.EXPAND_VARIABLES}",
false);

for (ln = opts.variables.first; ln != NULL; ln = ln->next)
PrintVariable(ln->datum, expandVars);
}

static bool
MakeTargets(void)
{
GNodeList targets = LST_INIT;
bool outOfDate; /* false if all targets up to date */

if (Lst_IsEmpty(&opts.create))
Parse_MainName(&targets);
else
Targ_FindList(&targets, &opts.create);

if (!opts.compatMake) {
if (!opts.query) {
Job_Init();
jobsRunning = true;
}

outOfDate = Make_MakeParallel(&targets);
} else {
Compat_MakeAll(&targets);
outOfDate = false;
}
Lst_Done(&targets); /* Don't free the targets themselves. */
return outOfDate;
}

/*
* Set up the .TARGETS variable to contain the list of targets to be created.
* If none specified, make the variable empty for now, the parser will fill
* in the default or .MAIN target later.
*/
static void
InitVarTargets(void)
{
StringListNode *ln;

if (Lst_IsEmpty(&opts.create)) {
Global_Set(".TARGETS", "");
return;
}

for (ln = opts.create.first; ln != NULL; ln = ln->next) {
const char *name = ln->datum;
Global_Append(".TARGETS", name);
}
}

static void
InitRandom(void)
{
struct timeval tv;

gettimeofday(&tv, NULL);
srandom((unsigned)(tv.tv_sec + tv.tv_usec));
}

static const char *
InitVarMachine(const struct utsname *utsname MAKE_ATTR_UNUSED)
{
const char *machine = getenv("MACHINE");
if (machine != NULL)
return machine;

#if defined(MAKE_NATIVE)
return utsname->machine;
#elif defined(MAKE_MACHINE)
return MAKE_MACHINE;
#else
return "unknown";
#endif
}

static const char *
InitVarMachineArch(void)
{
const char *env = getenv("MACHINE_ARCH");
if (env != NULL)
return env;

#ifdef MAKE_NATIVE
{
struct utsname utsname;
static char machine_arch_buf[sizeof utsname.machine];
const int mib[2] = { CTL_HW, HW_MACHINE_ARCH };
size_t len = sizeof machine_arch_buf;

if (sysctl(mib, (unsigned)__arraycount(mib),
machine_arch_buf, &len, NULL, 0) < 0) {
(void)fprintf(stderr, "%s: sysctl: %s\n",
progname, strerror(errno));
exit(2);
}

return machine_arch_buf;
}
#elif defined(MACHINE_ARCH)
return MACHINE_ARCH;
#elif defined(MAKE_MACHINE_ARCH)
return MAKE_MACHINE_ARCH;
#else
return "unknown";
#endif
}

#ifndef NO_PWD_OVERRIDE
/*
* Overriding getcwd() with $PWD totally breaks MAKEOBJDIRPREFIX
* since the value of curdir can vary depending on how we got
* here. That is, sitting at a shell prompt (shell that provides $PWD)
* or via subdir.mk, in which case it's likely a shell which does
* not provide it.
*
* So, to stop it breaking this case only, we ignore PWD if
* MAKEOBJDIRPREFIX is set or MAKEOBJDIR contains an expression.
*/
static void
HandlePWD(const struct stat *curdir_st)
{
char *pwd;
FStr makeobjdir;
struct stat pwd_st;

if (ignorePWD || (pwd = getenv("PWD")) == NULL)
return;

if (Var_Exists(SCOPE_CMDLINE, "MAKEOBJDIRPREFIX"))
return;

makeobjdir = Var_Value(SCOPE_CMDLINE, "MAKEOBJDIR");
if (makeobjdir.str != NULL && strchr(makeobjdir.str, '$') != NULL)
goto ignore_pwd;

if (stat(pwd, &pwd_st) == 0 &&
curdir_st->st_ino == pwd_st.st_ino &&
curdir_st->st_dev == pwd_st.st_dev)
snprintf(curdir, MAXPATHLEN, "%s", pwd);

ignore_pwd:
FStr_Done(&makeobjdir);
}
#endif

/*
* Find the .OBJDIR. If MAKEOBJDIRPREFIX, or failing that, MAKEOBJDIR is set
* in the environment, try only that value and fall back to .CURDIR if it
* does not exist.
*
* Otherwise, try _PATH_OBJDIR.MACHINE-MACHINE_ARCH, _PATH_OBJDIR.MACHINE,
* and finally _PATH_OBJDIRPREFIX`pwd`, in that order. If none of these
* paths exist, just use .CURDIR.
*/
static void
InitObjdir(const char *machine, const char *machine_arch)
{
bool writable;

Dir_InitCur(curdir);
writable = GetBooleanExpr("${MAKE_OBJDIR_CHECK_WRITABLE}", true);
(void)Main_SetObjdir(false, "%s", curdir);

if (!SetVarObjdir(writable, "MAKEOBJDIRPREFIX", curdir) &&
!SetVarObjdir(writable, "MAKEOBJDIR", "") &&
!Main_SetObjdir(writable, "%s.%s-%s", _PATH_OBJDIR, machine, machine_arch) &&
!Main_SetObjdir(writable, "%s.%s", _PATH_OBJDIR, machine) &&
!Main_SetObjdir(writable, "%s", _PATH_OBJDIR))
(void)Main_SetObjdir(writable, "%s%s", _PATH_OBJDIRPREFIX, curdir);
}

/* get rid of resource limit on file descriptors */
static void
UnlimitFiles(void)
{
#if defined(MAKE_NATIVE) || (defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE))
struct rlimit rl;
if (getrlimit(RLIMIT_NOFILE, &rl) != -1 &&
rl.rlim_cur != rl.rlim_max) {
rl.rlim_cur = rl.rlim_max;
(void)setrlimit(RLIMIT_NOFILE, &rl);
}
#endif
}

static void
CmdOpts_Init(void)
{
opts.compatMake = false;
memset(&opts.debug, 0, sizeof(opts.debug));
/* opts.debug_file has already been initialized earlier */
opts.strict = false;
opts.debugVflag = false;
opts.checkEnvFirst = false;
Lst_Init(&opts.makefiles);
opts.ignoreErrors = false; /* Pay attention to non-zero returns */
opts.maxJobs = 1;
opts.keepgoing = false; /* Stop on error */
opts.noRecursiveExecute = false; /* Execute all .MAKE targets */
opts.noExecute = false; /* Execute all commands */
opts.query = false;
opts.noBuiltins = false; /* Read the built-in rules */
opts.silent = false; /* Print commands as executed */
opts.touch = false;
opts.printVars = PVM_NONE;
Lst_Init(&opts.variables);
opts.parseWarnFatal = false;
opts.enterFlag = false;
opts.varNoExportEnv = false;
Lst_Init(&opts.create);
}

/*
* Initialize MAKE and .MAKE to the path of the executable, so that it can be
* found by execvp(3) and the shells, even after a chdir.
*
* If it's a relative path and contains a '/', resolve it to an absolute path.
* Otherwise keep it as is, assuming it will be found in the PATH.
*/
static void
InitVarMake(const char *argv0)
{
const char *make = argv0;
char pathbuf[MAXPATHLEN];

if (argv0[0] != '/' && strchr(argv0, '/') != NULL) {
const char *abspath = cached_realpath(argv0, pathbuf);
struct stat st;
if (abspath != NULL && abspath[0] == '/' &&
stat(make, &st) == 0)
make = abspath;
}

Global_Set("MAKE", make);
Global_Set(".MAKE", make);
}

/*
* Add the directories from the colon-separated syspath to defSysIncPath.
* After returning, the contents of syspath is unspecified.
*/
static void
InitDefSysIncPath(char *syspath)
{
static char defsyspath[] = _PATH_DEFSYSPATH;
char *start, *p;

/*
* If no user-supplied system path was given (through the -m option)
* add the directories from the DEFSYSPATH (more than one may be given
* as dir1:...:dirn) to the system include path.
*/
if (syspath == NULL || syspath[0] == '\0')
syspath = defsyspath;
else
syspath = bmake_strdup(syspath);

for (start = syspath; *start != '\0'; start = p) {
for (p = start; *p != '\0' && *p != ':'; p++)
continue;
if (*p == ':')
*p++ = '\0';

/* look for magic parent directory search string */
if (strncmp(start, ".../", 4) == 0) {
char *dir = Dir_FindHereOrAbove(curdir, start + 4);
if (dir != NULL) {
(void)SearchPath_Add(defSysIncPath, dir);
free(dir);
}
} else {
(void)SearchPath_Add(defSysIncPath, start);
}
}

if (syspath != defsyspath)
free(syspath);
}

static void
ReadBuiltinRules(void)
{
StringListNode *ln;
StringList sysMkFiles = LST_INIT;

SearchPath_Expand(
Lst_IsEmpty(&sysIncPath->dirs) ? defSysIncPath : sysIncPath,
_PATH_DEFSYSMK,
&sysMkFiles);
if (Lst_IsEmpty(&sysMkFiles))
Fatal("%s: no system rules (%s).", progname, _PATH_DEFSYSMK);

for (ln = sysMkFiles.first; ln != NULL; ln = ln->next)
if (ReadMakefile(ln->datum))
break;

if (ln == NULL)
Fatal("%s: cannot open %s.",
progname, (const char *)sysMkFiles.first->datum);

Lst_DoneFree(&sysMkFiles);
}

static void
InitMaxJobs(void)
{
char *value;
int n;

if (bogusJflag && !opts.compatMake) {
opts.compatMake = true;
Parse_Error(PARSE_WARNING,
"internal option \"-J\" in \"%s\" "
"refers to unopened file descriptors; "
"falling back to compat mode.\n"
"\t"
"To run the target even in -n mode, "
"add the .MAKE pseudo-source to the target.\n"
"\t"
"To run the target in default mode only, "
"add a ${:D make} marker to a target's command. "
"(This marker expression expands to an empty string.)\n"
"\t"
"To make the sub-make run in compat mode, add -B to "
"its invocation.\n"
"\t"
"To make the sub-make independent from the parent make, "
"unset the MAKEFLAGS environment variable in the "
"target's commands.",
curdir);
PrintStackTrace(true);
return;
}
if (forceJobs || opts.compatMake ||
!Var_Exists(SCOPE_GLOBAL, ".MAKE.JOBS"))
return;

value = Var_Subst("${.MAKE.JOBS}", SCOPE_GLOBAL, VARE_EVAL);
/* TODO: handle errors */
n = (int)strtol(value, NULL, 0);
if (n < 1) {
(void)fprintf(stderr,
"%s: illegal value for .MAKE.JOBS "
"-- must be positive integer!\n",
progname);
exit(2); /* Not 1 so -q can distinguish error */
}

if (n != opts.maxJobs) {
Global_Append(MAKEFLAGS, "-j");
Global_Append(MAKEFLAGS, value);
}

opts.maxJobs = n;
maxJobTokens = opts.maxJobs;
forceJobs = true;
free(value);
}

/*
* For compatibility, look at the directories in the VPATH variable
* and add them to the search path, if the variable is defined. The
* variable's value is in the same format as the PATH environment
* variable, i.e. <directory>:<directory>:<directory>...
*/
static void
InitVpath(void)
{
char *vpath, savec, *path;
if (!Var_Exists(SCOPE_CMDLINE, "VPATH"))
return;

vpath = Var_Subst("${VPATH}", SCOPE_CMDLINE, VARE_EVAL);
/* TODO: handle errors */
path = vpath;
do {
char *p;
/* skip to end of directory */
for (p = path; *p != ':' && *p != '\0'; p++)
continue;
/* Save terminator character so know when to stop */
savec = *p;
*p = '\0';
/* Add directory to search path */
(void)SearchPath_Add(&dirSearchPath, path);
*p = savec;
path = p + 1;
} while (savec == ':');
free(vpath);
}

static void
ReadAllMakefiles(const StringList *makefiles)
{
StringListNode *ln;

for (ln = makefiles->first; ln != NULL; ln = ln->next) {
const char *fname = ln->datum;
if (!ReadMakefile(fname))
Fatal("%s: cannot open %s.", progname, fname);
}
}

static void
ReadFirstDefaultMakefile(void)
{
StringList makefiles = LST_INIT;
StringListNode *ln;
char *prefs = Var_Subst("${.MAKE.MAKEFILE_PREFERENCE}",
SCOPE_CMDLINE, VARE_EVAL);
/* TODO: handle errors */

AppendWords(&makefiles, prefs);

for (ln = makefiles.first; ln != NULL; ln = ln->next)
if (ReadMakefile(ln->datum))
break;

Lst_Done(&makefiles);
free(prefs);
}

/*
* Initialize variables such as MAKE, MACHINE, .MAKEFLAGS.
* Initialize a few modules.
* Parse the arguments from MAKEFLAGS and the command line.
*/
static void
main_Init(int argc, char **argv)
{
struct stat sa;
const char *machine;
const char *machine_arch;
char *syspath = getenv("MAKESYSPATH");
struct utsname utsname;

/* default to writing debug to stderr */
opts.debug_file = stderr;

Str_Intern_Init();
HashTable_Init(&cached_realpaths);

#ifdef SIGINFO
(void)bmake_signal(SIGINFO, siginfo);
#endif

InitRandom();

progname = str_basename(argv[0]);

UnlimitFiles();

if (uname(&utsname) == -1) {
(void)fprintf(stderr, "%s: uname: %s\n", progname,
strerror(errno));
exit(2);
}

machine = InitVarMachine(&utsname);
machine_arch = InitVarMachineArch();

myPid = getpid();

/* Just in case MAKEOBJDIR wants us to do something tricky. */
Targ_Init();
Global_Set_ReadOnly(".MAKE.OS", utsname.sysname);
Global_Set("MACHINE", machine);
Global_Set("MACHINE_ARCH", machine_arch);
#ifdef MAKE_VERSION
Global_Set("MAKE_VERSION", MAKE_VERSION);
#endif
Global_Set_ReadOnly(".newline", "\n");
#ifndef MAKEFILE_PREFERENCE_LIST
/* This is the traditional preference for makefiles. */
# define MAKEFILE_PREFERENCE_LIST "makefile Makefile"
#endif
Global_Set(".MAKE.MAKEFILE_PREFERENCE", MAKEFILE_PREFERENCE_LIST);
Global_Set(".MAKE.DEPENDFILE", ".depend");
/* Tell makefiles like jobs.mk whether we support -jC */
#ifdef _SC_NPROCESSORS_ONLN
Global_Set_ReadOnly(".MAKE.JOBS.C", "yes");
#else
Global_Set_ReadOnly(".MAKE.JOBS.C", "no");
#endif

CmdOpts_Init();
allPrecious = false; /* Remove targets when interrupted */
deleteOnError = false; /* Historical default behavior */
jobsRunning = false;

maxJobTokens = opts.maxJobs;
ignorePWD = false;

/*
* Initialize the parsing, directory and variable modules to prepare
* for the reading of inclusion paths and variable settings on the
* command line
*/

/*
* Initialize various variables.
* MAKE also gets this name, for compatibility
* .MAKEFLAGS gets set to the empty string just in case.
* MFLAGS also gets initialized empty, for compatibility.
*/
Parse_Init();
InitVarMake(argv[0]);
Global_Set(MAKEFLAGS, "");
Global_Set(".MAKEOVERRIDES", "");
Global_Set("MFLAGS", "");
Global_Set(".ALLTARGETS", "");
Global_Set_ReadOnly(".MAKE.LEVEL.ENV", MAKE_LEVEL_ENV);

/* Set some other useful variables. */
{
char buf[64];
const char *ep = getenv(MAKE_LEVEL_ENV);

makelevel = ep != NULL && ep[0] != '\0' ? atoi(ep) : 0;
if (makelevel < 0)
makelevel = 0;
snprintf(buf, sizeof buf, "%d", makelevel);
Global_Set(".MAKE.LEVEL", buf);
snprintf(buf, sizeof buf, "%u", myPid);
Global_Set_ReadOnly(".MAKE.PID", buf);
snprintf(buf, sizeof buf, "%u", getppid());
Global_Set_ReadOnly(".MAKE.PPID", buf);
snprintf(buf, sizeof buf, "%u", getuid());
Global_Set_ReadOnly(".MAKE.UID", buf);
snprintf(buf, sizeof buf, "%u", getgid());
Global_Set_ReadOnly(".MAKE.GID", buf);
}
if (makelevel > 0) {
char pn[1024];
snprintf(pn, sizeof pn, "%s[%d]", progname, makelevel);
progname = bmake_strdup(pn);
}

#ifdef USE_META
meta_init();
#endif
Dir_Init();

if (getcwd(curdir, MAXPATHLEN) == NULL) {
(void)fprintf(stderr, "%s: getcwd: %s\n",
progname, strerror(errno));
exit(2);
}

{
char *makeflags = explode(getenv("MAKEFLAGS"));
Main_ParseArgLine(makeflags);
free(makeflags);
}

MainParseArgs(argc, argv);

if (opts.enterFlag)
printf("%s: Entering directory `%s'\n", progname, curdir);

if (stat(curdir, &sa) == -1) {
(void)fprintf(stderr, "%s: stat %s: %s\n",
progname, curdir, strerror(errno));
exit(2);
}

#ifndef NO_PWD_OVERRIDE
HandlePWD(&sa);
#endif
Global_Set(".CURDIR", curdir);

InitObjdir(machine, machine_arch);

Arch_Init();
Suff_Init();
Trace_Init(tracefile);

defaultNode = NULL;
(void)time(&now);

Trace_Log(MAKESTART, NULL);

InitVarTargets();

InitDefSysIncPath(syspath);
}

/*
* Read the system makefile followed by either makefile, Makefile or the
* files given by the -f option. Exit on parse errors.
*/
static void
main_ReadFiles(void)
{

if (Lst_IsEmpty(&sysIncPath->dirs))
SearchPath_AddAll(sysIncPath, defSysIncPath);

Dir_SetSYSPATH();
if (!opts.noBuiltins)
ReadBuiltinRules();

posix_state = PS_MAYBE_NEXT_LINE;
if (!Lst_IsEmpty(&opts.makefiles))
ReadAllMakefiles(&opts.makefiles);
else
ReadFirstDefaultMakefile();
}

/* Compute the dependency graph. */
static void
main_PrepareMaking(void)
{
/* In particular suppress .depend for '-r -V .OBJDIR -f /dev/null' */
if (!opts.noBuiltins || opts.printVars == PVM_NONE) {
makeDependfile = Var_Subst("${.MAKE.DEPENDFILE}",
SCOPE_CMDLINE, VARE_EVAL);
if (makeDependfile[0] != '\0') {
/* TODO: handle errors */
doing_depend = true;
(void)ReadMakefile(makeDependfile);
doing_depend = false;
}
}

if (enterFlagObj)
printf("%s: Entering directory `%s'\n", progname, objdir);

MakeMode();

{
FStr makeflags = Var_Value(SCOPE_GLOBAL, MAKEFLAGS);
Global_Append("MFLAGS", makeflags.str);
FStr_Done(&makeflags);
}

InitMaxJobs();

if (!opts.compatMake && !forceJobs)
opts.compatMake = true;

if (!opts.compatMake)
TokenPool_Init(maxJobTokens, tokenPoolReader, tokenPoolWriter);
DEBUG5(JOB, "job_pipe %d %d, maxjobs %d, tokens %d, compat %d\n",
tokenPoolReader, tokenPoolWriter, opts.maxJobs, maxJobTokens,
opts.compatMake ? 1 : 0);

if (opts.printVars == PVM_NONE)
Main_ExportMAKEFLAGS(true); /* initial export */

InitVpath();

/*
* Now that all search paths have been read for suffixes et al, it's
* time to add the default search path to their lists...
*/
Suff_ExtendPaths();

/*
* Propagate attributes through :: dependency lists.
*/
Targ_Propagate();

/* print the initial graph, if the user requested it */
if (DEBUG(GRAPH1))
Targ_PrintGraph(1);
}

/*
* Make the targets, or print variables.
* Return whether any of the targets is out-of-date.
*/
static bool
main_Run(void)
{
if (opts.printVars != PVM_NONE) {
PrintVariables();
return false;
} else
return MakeTargets();
}

/* Clean up after making the targets. */
static void
main_CleanUp(void)
{
#ifdef CLEANUP
Lst_DoneFree(&opts.variables);
Lst_DoneFree(&opts.makefiles);
Lst_DoneFree(&opts.create);
#endif

if (DEBUG(GRAPH2))
Targ_PrintGraph(2);

Trace_Log(MAKEEND, NULL);

if (enterFlagObj)
printf("%s: Leaving directory `%s'\n", progname, objdir);
if (opts.enterFlag)
printf("%s: Leaving directory `%s'\n", progname, curdir);

Var_Stats();
Targ_Stats();

#ifdef USE_META
meta_finish();
#endif
#ifdef CLEANUP
Suff_End();
Targ_End();
Arch_End();
Parse_End();
Dir_End();
Job_End();
#endif
Trace_End();
#ifdef CLEANUP
Str_Intern_End();
#endif
}

static int
main_ExitCode(bool outOfDate)
{
if ((opts.strict && main_errors > 0) || parseErrors > 0)
return 2; /* Not 1 so -q can distinguish error */
return outOfDate ? 1 : 0;
}

int
main(int argc, char **argv)
{
bool outOfDate;

main_Init(argc, argv);
main_ReadFiles();
main_PrepareMaking();
outOfDate = main_Run();
main_CleanUp();
return main_ExitCode(outOfDate);
}

/*
* Open and parse the given makefile, with all its side effects.
* Return false if the file could not be opened.
*/
static bool
ReadMakefile(const char *fname)
{
int fd;
char *name, *path = NULL;

if (strcmp(fname, "-") == 0) {
Parse_File("(stdin)", -1);
Var_Set(SCOPE_INTERNAL, "MAKEFILE", "");
} else {
if (strncmp(fname, ".../", 4) == 0) {
name = Dir_FindHereOrAbove(curdir, fname + 4);
if (name != NULL) {
/* Dir_FindHereOrAbove returns dirname */
path = str_concat3(name, "/",
str_basename(fname));
free(name);
fd = open(path, O_RDONLY);
if (fd != -1) {
fname = path;
goto found;
}
}
}
/* if we've chdir'd, rebuild the path name */
if (strcmp(curdir, objdir) != 0 && *fname != '/') {
path = str_concat3(curdir, "/", fname);
fd = open(path, O_RDONLY);
if (fd != -1) {
fname = path;
goto found;
}
free(path);

/* If curdir failed, try objdir (ala .depend) */
path = str_concat3(objdir, "/", fname);
fd = open(path, O_RDONLY);
if (fd != -1) {
fname = path;
goto found;
}
} else {
fd = open(fname, O_RDONLY);
if (fd != -1)
goto found;
}
/* look in -I and system include directories. */
name = Dir_FindFile(fname, parseIncPath);
if (name == NULL) {
SearchPath *sysInc = Lst_IsEmpty(&sysIncPath->dirs)
? defSysIncPath : sysIncPath;
name = Dir_FindFile(fname, sysInc);
}
if (name == NULL || (fd = open(name, O_RDONLY)) == -1) {
free(name);
free(path);
return false;
}
fname = name;
/*
* set the MAKEFILE variable desired by System V fans -- the
* placement of the setting here means it gets set to the last
* makefile specified, as it is set by SysV make.
*/
found:
if (!doing_depend)
Var_Set(SCOPE_INTERNAL, "MAKEFILE", fname);
Parse_File(fname, fd);
}
free(path);
return true;
}

/* populate av for Cmd_Exec and Compat_RunCommand */
int
Cmd_Argv(const char *cmd, size_t cmd_len, const char **av, size_t avsz,
char *cmd_file, size_t cmd_filesz, bool eflag, bool xflag)
{
int ac = 0;
int cmd_fd = -1;

if (shellPath == NULL)
Shell_Init();

if (cmd_file != NULL) {
if (cmd_len == 0)
cmd_len = strlen(cmd);

if (cmd_len > MAKE_CMDLEN_LIMIT) {
cmd_fd = mkTempFile(NULL, cmd_file, cmd_filesz);
if (cmd_fd >= 0) {
ssize_t n;

n = write(cmd_fd, cmd, cmd_len);
close(cmd_fd);
if (n < (ssize_t)cmd_len) {
unlink(cmd_file);
cmd_fd = -1;
}
}
} else
cmd_file[0] = '\0';
}

if (avsz < 4 || (eflag && avsz < 5))
return -1;

/* The following works for any of the builtin shell specs. */
av[ac++] = shellPath;
if (eflag)
av[ac++] = shellErrFlag;
if (cmd_fd >= 0) {
if (xflag)
av[ac++] = "-x";
av[ac++] = cmd_file;
} else {
av[ac++] = xflag ? "-xc" : "-c";
av[ac++] = cmd;
}
av[ac] = NULL;
return ac;
}

/*
* Execute the command in cmd, and return its output (only stdout, not
* stderr, possibly empty). In the output, replace newlines with spaces.
*/
char *
Cmd_Exec(const char *cmd, char **error)
{
const char *args[4]; /* Arguments for invoking the shell */
int pipefds[2];
int cpid; /* Child PID */
int pid; /* PID from wait() */
int status; /* command exit status */
Buffer buf; /* buffer to store the result */
ssize_t bytes_read;
char *output;
char *p;
int saved_errno;
char cmd_file[MAXPATHLEN];

DEBUG1(VAR, "Capturing the output of command \"%s\"\n", cmd);

if (Cmd_Argv(cmd, 0, args, 4, cmd_file, sizeof(cmd_file), false, false) < 0
|| pipe(pipefds) == -1) {
*error = str_concat3(
"Couldn't create pipe for \"", cmd, "\"");
return bmake_strdup("");
}

Var_ReexportVars(SCOPE_GLOBAL);
Var_ExportStackTrace(NULL, cmd);

switch (cpid = FORK_FUNCTION()) {
case 0:
(void)close(pipefds[0]);
(void)dup2(pipefds[1], STDOUT_FILENO);
(void)close(pipefds[1]);

(void)execv(shellPath, UNCONST(args));
_exit(1);
/* NOTREACHED */

case -1:
*error = str_concat3("Couldn't exec \"", cmd, "\"");
return bmake_strdup("");
}

(void)close(pipefds[1]); /* No need for the writing half */

saved_errno = 0;
Buf_Init(&buf);

do {
char result[BUFSIZ];
bytes_read = read(pipefds[0], result, sizeof result);
if (bytes_read > 0)
Buf_AddBytes(&buf, result, (size_t)bytes_read);
} while (bytes_read > 0 || (bytes_read == -1 && errno == EINTR));
if (bytes_read == -1)
saved_errno = errno;

(void)close(pipefds[0]); /* Close the input side of the pipe. */

while ((pid = waitpid(cpid, &status, 0)) != cpid && pid >= 0)
JobReapChild(pid, status, false);

if (Buf_EndsWith(&buf, '\n'))
buf.data[buf.len - 1] = '\0';

output = Buf_DoneData(&buf);
for (p = output; *p != '\0'; p++)
if (*p == '\n')
*p = ' ';

if (WIFSIGNALED(status))
*error = str_concat3("\"", cmd, "\" exited on a signal");
else if (WEXITSTATUS(status) != 0) {
Buffer errBuf;
Buf_Init(&errBuf);
Buf_AddStr(&errBuf, "Command \"");
Buf_AddStr(&errBuf, cmd);
Buf_AddStr(&errBuf, "\" exited with status ");
Buf_AddInt(&errBuf, WEXITSTATUS(status));
*error = Buf_DoneData(&errBuf);
} else if (saved_errno != 0)
*error = str_concat3(
"Couldn't read shell's output for \"", cmd, "\"");
else
*error = NULL;
if (cmd_file[0] != '\0')
unlink(cmd_file);
return output;
}

/*
* Print a printf-style error message.
*
* In default mode, this error message has no consequences, for compatibility
* reasons, in particular it does not affect the exit status. Only in lint
* mode (-dL) it does.
*/
void
Error(const char *fmt, ...)
{
va_list ap;
FILE *f;

f = opts.debug_file;
if (f == stdout)
f = stderr;
(void)fflush(stdout);

for (;;) {
fprintf(f, "%s: ", progname);
va_start(ap, fmt);
(void)vfprintf(f, fmt, ap);
va_end(ap);
(void)fprintf(f, "\n");
(void)fflush(f);
if (f == stderr)
break;
f = stderr;
}
main_errors++;
}

/*
* Wait for any running jobs to finish, then produce an error message,
* finally exit immediately.
*
* Exiting immediately differs from Parse_Error, which exits only after the
* current top-level makefile has been parsed completely.
*/
void
Fatal(const char *fmt, ...)
{
va_list ap;

if (jobsRunning)
Job_Wait();

(void)fflush(stdout);
fprintf(stderr, "%s: ", progname);
va_start(ap, fmt);
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
(void)fprintf(stderr, "\n");
(void)fflush(stderr);
PrintStackTrace(true);

PrintOnError(NULL, "\n");

if (DEBUG(GRAPH2) || DEBUG(GRAPH3))
Targ_PrintGraph(2);
Trace_Log(MAKEERROR, NULL);
exit(2); /* Not 1 so -q can distinguish error */
}

/*
* Major exception once jobs are being created.
* Kills all jobs, prints a message and exits.
*/
void
Punt(const char *fmt, ...)
{
va_list ap;

(void)fflush(stdout);
(void)fprintf(stderr, "%s: ", progname);
va_start(ap, fmt);
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
(void)fprintf(stderr, "\n");
(void)fflush(stderr);

PrintOnError(NULL, "\n");

DieHorribly();
}

/* Exit without giving a message. */
void
DieHorribly(void)
{
if (jobsRunning)
Job_AbortAll();
if (DEBUG(GRAPH2))
Targ_PrintGraph(2);
Trace_Log(MAKEERROR, NULL);
exit(2); /* Not 1 so -q can distinguish error */
}

int
unlink_file(const char *file)
{
struct stat st;

if (lstat(file, &st) == -1)
return -1;

if (S_ISDIR(st.st_mode)) {
/*
* POSIX says for unlink: "The path argument shall not name
* a directory unless [...]".
*/
errno = EISDIR;
return -1;
}
return unlink(file);
}

static void
write_all(int fd, const void *data, size_t n)
{
const char *mem = data;

while (n > 0) {
ssize_t written = write(fd, mem, n);
/* XXX: Should this EAGAIN be EINTR? */
if (written == -1 && errno == EAGAIN)
continue;
if (written == -1)
break;
mem += written;
n -= (size_t)written;
}
}

/* Print why exec failed, avoiding stdio. */
void MAKE_ATTR_DEAD
execDie(const char *func, const char *arg)
{
char msg[1024];
int len;

len = snprintf(msg, sizeof(msg), "%s: %s(%s): %s\n",
progname, func, arg, strerror(errno));
write_all(STDERR_FILENO, msg, (size_t)len);
_exit(1);
}

static void
purge_relative_cached_realpaths(void)
{
HashIter hi;
bool more;

HashIter_Init(&hi, &cached_realpaths);
more = HashIter_Next(&hi);
while (more) {
HashEntry *he = hi.entry;
more = HashIter_Next(&hi);
if (he->key[0] != '/') {
DEBUG1(DIR, "cached_realpath: purging %s\n", he->key);
free(he->value);
HashTable_DeleteEntry(&cached_realpaths, he);
}
}
}

const char *
cached_realpath(const char *pathname, char *resolved)
{
const char *rp;

if (pathname == NULL || pathname[0] == '\0')
return NULL;

rp = HashTable_FindValue(&cached_realpaths, pathname);
if (rp != NULL) {
snprintf(resolved, MAXPATHLEN, "%s", rp);
return resolved;
}

rp = realpath(pathname, resolved);
if (rp != NULL) {
HashTable_Set(&cached_realpaths, pathname, bmake_strdup(rp));
DEBUG2(DIR, "cached_realpath: %s -> %s\n", pathname, rp);
return resolved;
}

/* should we negative-cache? */
return NULL;
}

/*
* Return true if we should die without noise.
* For example our failing child was a sub-make or failure happened elsewhere.
*/
bool
shouldDieQuietly(GNode *gn, int bf)
{
static int quietly = -1;

if (quietly < 0) {
if (DEBUG(JOB) ||
!GetBooleanExpr("${.MAKE.DIE_QUIETLY}", true))
quietly = 0;
else if (bf >= 0)
quietly = bf;
else
quietly = (gn != NULL && (gn->type & OP_MAKE)) ? 1 : 0;
}
return quietly != 0;
}

static void
SetErrorVars(GNode *gn)
{
StringListNode *ln;
char sts[16];

/*
* We can print this even if there is no .ERROR target.
*/
snprintf(sts, sizeof(sts), "%d", gn->exit_status);
Global_Set(".ERROR_EXIT", sts);
Global_Set(".ERROR_TARGET", gn->name);
Global_Delete(".ERROR_CMD");

for (ln = gn->commands.first; ln != NULL; ln = ln->next) {
const char *cmd = ln->datum;

if (cmd == NULL)
break;
Global_Append(".ERROR_CMD", cmd);
}
}

/*
* Print some helpful information in case of an error.
* The caller should exit soon after calling this function.
*/
void
PrintOnError(GNode *gn, const char *msg)
{
static GNode *errorNode = NULL;
StringListNode *ln;

if (DEBUG(HASH)) {
Targ_Stats();
Var_Stats();
}

if (errorNode != NULL)
return; /* we've been here! */

printf("%s%s: stopped", msg, progname);
ln = opts.create.first;
if (ln != NULL || mainNode != NULL) {
printf(" making \"");
if (ln != NULL) {
printf("%s", (const char *)ln->datum);
for (ln = ln->next; ln != NULL; ln = ln->next)
printf(" %s", (const char *)ln->datum);
} else
printf("%s", mainNode->name);
printf("\"");
}
printf(" in %s\n", curdir);

/* we generally want to keep quiet if a sub-make died */
if (shouldDieQuietly(gn, -1))
return;

if (gn != NULL)
SetErrorVars(gn);

{
char *errorVarsValues;
enum PosixState p_s = posix_state;

posix_state = PS_TOO_LATE;
errorVarsValues = Var_Subst(
"${MAKE_PRINT_VAR_ON_ERROR:@v@$v='${$v}'\n@}",
SCOPE_GLOBAL, VARE_EVAL);
/* TODO: handle errors */
printf("%s", errorVarsValues);
free(errorVarsValues);
posix_state = p_s;
}

fflush(stdout);

/*
* Finally, see if there is a .ERROR target, and run it if so.
*/
errorNode = Targ_FindNode(".ERROR");
if (errorNode != NULL) {
errorNode->type |= OP_SPECIAL;
Compat_Make(errorNode, errorNode);
}
}

void
Main_ExportMAKEFLAGS(bool first)
{
static bool once = true;
enum PosixState p_s;
char *flags;

if (once != first)
return;
once = false;

p_s = posix_state;
posix_state = PS_TOO_LATE;
flags = Var_Subst(
"${.MAKEFLAGS} ${.MAKEOVERRIDES:O:u:@v@$v=${$v:Q}@}",
SCOPE_CMDLINE, VARE_EVAL);
/* TODO: handle errors */
if (flags[0] != '\0')
setenv("MAKEFLAGS", flags, 1);
free(flags);
posix_state = p_s;
}

char *
getTmpdir(void)
{
static char *tmpdir = NULL;
struct stat st;

if (tmpdir != NULL)
return tmpdir;

/* Honor $TMPDIR if it is valid, strip a trailing '/'. */
tmpdir = Var_Subst("${TMPDIR:tA:U" _PATH_TMP ":S,/$,,W}/",
SCOPE_GLOBAL, VARE_EVAL);
/* TODO: handle errors */

if (stat(tmpdir, &st) < 0 || !S_ISDIR(st.st_mode)) {
free(tmpdir);
tmpdir = bmake_strdup(_PATH_TMP);
}
return tmpdir;
}

/*
* Create and open a temp file using "pattern".
* If tfile is provided, set it to a copy of the filename created.
* Otherwise unlink the file once open.
*/
int
mkTempFile(const char *pattern, char *tfile, size_t tfile_sz)
{
static char *tmpdir = NULL;
char tbuf[MAXPATHLEN];
int fd;

if (pattern == NULL)
pattern = "makeXXXXXX";
if (tmpdir == NULL)
tmpdir = getTmpdir();
if (tfile == NULL) {
tfile = tbuf;
tfile_sz = sizeof tbuf;
}

if (pattern[0] == '/')
snprintf(tfile, tfile_sz, "%s", pattern);
else
snprintf(tfile, tfile_sz, "%s%s", tmpdir, pattern);

if ((fd = mkstemp(tfile)) < 0)
Punt("mkstemp %s: %s", tfile, strerror(errno));
if (tfile == tbuf)
unlink(tfile); /* we just want the descriptor */

return fd;
}

/*
* Convert a string representation of a boolean into a boolean value.
* Anything that looks like "No", "False", "Off", "0" etc. is false,
* the empty string is the fallback, everything else is true.
*/
bool
ParseBoolean(const char *s, bool fallback)
{
char ch = ch_tolower(s[0]);
if (ch == '\0')
return fallback;
if (ch == '0' || ch == 'f' || ch == 'n')
return false;
if (ch == 'o')
return ch_tolower(s[1]) != 'f';
return true;
}