/* Utilities to execute a program in a subprocess (possibly linked by pipes
  with other subprocesses), and wait for it.  DJGPP specialization.
  Copyright (C) 1996-2024 Free Software Foundation, Inc.

This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

Libiberty is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB.  If not,
write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA.  */

#include "pex-common.h"

#include <stdio.h>
#include <errno.h>
#ifdef NEED_DECLARATION_ERRNO
extern int errno;
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <process.h>

/* Use ECHILD if available, otherwise use EINVAL.  */
#ifdef ECHILD
#define PWAIT_ERROR ECHILD
#else
#define PWAIT_ERROR EINVAL
#endif

static int pex_djgpp_open_read (struct pex_obj *, const char *, int);
static int pex_djgpp_open_write (struct pex_obj *, const char *, int, int);
static pid_t pex_djgpp_exec_child (struct pex_obj *, int, const char *,
                                 char * const *, char * const *,
                                 int, int, int, int,
                                 const char **, int *);
static int pex_djgpp_close (struct pex_obj *, int);
static pid_t pex_djgpp_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
                          int, const char **, int *);

/* The list of functions we pass to the common routines.  */

const struct pex_funcs funcs =
{
 pex_djgpp_open_read,
 pex_djgpp_open_write,
 pex_djgpp_exec_child,
 pex_djgpp_close,
 pex_djgpp_wait,
 NULL, /* pipe */
 NULL, /* fdopenr */
 NULL, /* fdopenw */
 NULL  /* cleanup */
};

/* Return a newly initialized pex_obj structure.  */

struct pex_obj *
pex_init (int flags, const char *pname, const char *tempbase)
{
 /* DJGPP does not support pipes.  */
 flags &= ~ PEX_USE_PIPES;
 return pex_init_common (flags, pname, tempbase, &funcs);
}

/* Open a file for reading.  */

static int
pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED,
                    const char *name, int binary)
{
 return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT));
}

/* Open a file for writing.  */

static int
pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED,
                     const char *name, int binary, int append)
{
 /* Note that we can't use O_EXCL here because gcc may have already
    created the temporary file via make_temp_file.  */
 if (append)
   return -1;
 return open (name,
              (O_WRONLY | O_CREAT | O_TRUNC
               | (binary ? O_BINARY : O_TEXT)),
              S_IRUSR | S_IWUSR);
}

/* Close a file.  */

static int
pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
{
 return close (fd);
}

/* Execute a child.  */

static pid_t
pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable,
                     char * const * argv, char * const * env,
                     int in, int out, int errdes,
                     int toclose ATTRIBUTE_UNUSED, const char **errmsg,
                     int *err)
{
 int org_in, org_out, org_errdes;
 int status;
 int *statuses;

 org_in = -1;
 org_out = -1;
 org_errdes = -1;

 if (in != STDIN_FILE_NO)
   {
     org_in = dup (STDIN_FILE_NO);
     if (org_in < 0)
       {
         *err = errno;
         *errmsg = "dup";
         return (pid_t) -1;
       }
     if (dup2 (in, STDIN_FILE_NO) < 0)
       {
         *err = errno;
         *errmsg = "dup2";
         return (pid_t) -1;
       }
     if (close (in) < 0)
       {
         *err = errno;
         *errmsg = "close";
         return (pid_t) -1;
       }
   }

 if (out != STDOUT_FILE_NO)
   {
     org_out = dup (STDOUT_FILE_NO);
     if (org_out < 0)
       {
         *err = errno;
         *errmsg = "dup";
         return (pid_t) -1;
       }
     if (dup2 (out, STDOUT_FILE_NO) < 0)
       {
         *err = errno;
         *errmsg = "dup2";
         return (pid_t) -1;
       }
     if (close (out) < 0)
       {
         *err = errno;
         *errmsg = "close";
         return (pid_t) -1;
       }
   }

 if (errdes != STDERR_FILE_NO
     || (flags & PEX_STDERR_TO_STDOUT) != 0)
   {
     org_errdes = dup (STDERR_FILE_NO);
     if (org_errdes < 0)
       {
         *err = errno;
         *errmsg = "dup";
         return (pid_t) -1;
       }
     if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
                STDERR_FILE_NO) < 0)
       {
         *err = errno;
         *errmsg = "dup2";
         return (pid_t) -1;
       }
     if (errdes != STDERR_FILE_NO)
       {
         if (close (errdes) < 0)
           {
             *err = errno;
             *errmsg = "close";
             return (pid_t) -1;
           }
       }
   }

 if (env)
   status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve)
             (P_WAIT, executable, argv, env));
 else
   status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv)
             (P_WAIT, executable, argv));

 if (status == -1)
   {
     *err = errno;
     *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv";
   }

 if (in != STDIN_FILE_NO)
   {
     if (dup2 (org_in, STDIN_FILE_NO) < 0)
       {
         *err = errno;
         *errmsg = "dup2";
         return (pid_t) -1;
       }
     if (close (org_in) < 0)
       {
         *err = errno;
         *errmsg = "close";
         return (pid_t) -1;
       }
   }

 if (out != STDOUT_FILE_NO)
   {
     if (dup2 (org_out, STDOUT_FILE_NO) < 0)
       {
         *err = errno;
         *errmsg = "dup2";
         return (pid_t) -1;
       }
     if (close (org_out) < 0)
       {
         *err = errno;
         *errmsg = "close";
         return (pid_t) -1;
       }
   }

 if (errdes != STDERR_FILE_NO
     || (flags & PEX_STDERR_TO_STDOUT) != 0)
   {
     if (dup2 (org_errdes, STDERR_FILE_NO) < 0)
       {
         *err = errno;
         *errmsg = "dup2";
         return (pid_t) -1;
       }
     if (close (org_errdes) < 0)
       {
         *err = errno;
         *errmsg = "close";
         return (pid_t) -1;
       }
   }

 /* Save the exit status for later.  When we are called, obj->count
    is the number of children which have executed before this
    one.  */
 statuses = (int *) obj->sysdep;
 statuses = XRESIZEVEC (int, statuses, obj->count + 1);
 statuses[obj->count] = status;
 obj->sysdep = (void *) statuses;

 return (pid_t) obj->count;
}

/* Wait for a child process to complete.  Actually the child process
  has already completed, and we just need to return the exit
  status.  */

static pid_t
pex_djgpp_wait (struct pex_obj *obj, pid_t pid, int *status,
               struct pex_time *time, int done ATTRIBUTE_UNUSED,
               const char **errmsg ATTRIBUTE_UNUSED,
               int *err ATTRIBUTE_UNUSED)
{
 int *statuses;

 if (time != NULL)
   memset (time, 0, sizeof *time);

 statuses = (int *) obj->sysdep;
 *status = statuses[pid];

 return 0;
}

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