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	proc.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	---
	proc.c (2391B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <sys/stat.h>
	3
	4 #include <errno.h>
	5 #include <fcntl.h>
	6 #include <limits.h>
	7 #include <stdio.h>
	8 #include <stdlib.h>
	9 #include <string.h>
	10 #include <unistd.h>
	11
	12 #include "../proc.h"
	13 #include "../util.h"
	14
	15 int
	16 parsecmdline(pid_t pid, char *buf, size_t siz)
	17 {
	18 int fd;
	19 char path[PATH_MAX];
	20 ssize_t n, i;
	21
	22 snprintf(path, sizeof(path), "/proc/%ld/cmdline", (long)pid);
	23 fd = open(path, O_RDONLY);
	24 if (fd < 0)
	25 return -1;
	26 n = read(fd, buf, siz > 0 ? siz - 1 : 0);
	27 if (n < 0) {
	28 weprintf("read %s:", path);
	29 close(fd);
	30 return -1;
	31 }
	32 if (!n) {
	33 close(fd);
	34 return -1;
	35 }
	36 buf[n] = '\0';
	37 for (i = 0; i < n; i++)
	38 if (buf[i] == '\0')
	39 buf[i] = ' ';
	40 close(fd);
	41 return 0;
	42 }
	43
	44 int
	45 parsestat(pid_t pid, struct procstat *ps)
	46 {
	47 char path[PATH_MAX];
	48 FILE *fp;
	49 size_t len;
	50
	51 snprintf(path, sizeof(path), "/proc/%d/stat", pid);
	52 if (!(fp = fopen(path, "r")))
	53 return -1;
	54 fscanf(fp, "%d %s %c %d %d %d %d %d %u %lu %lu %lu %lu %lu %lu",
	55 &ps->pid, ps->comm,
	56 &ps->state, &ps->ppid, &ps->pgrp,
	57 &ps->sid, &ps->tty_nr, &ps->tpgid, &ps->flags,
	58 &ps->minflt, &ps->cminflt, &ps->majflt, &ps->cmajflt,
	59 &ps->utime, &ps->stime);
	60 fscanf(fp, "%ld %ld %ld %ld %ld %ld %llu %lu %ld %ld",
	61 &ps->cutime, &ps->cstime, &ps->priority, &ps->nice,
	62 &ps->num_threads, &ps->itrealvalue, &ps->starttime,
	63 &ps->vsize, &ps->rss, &ps->rsslim);
	64 /* Filter out '(' and ')' from comm */
	65 if ((len = strlen(ps->comm)) > 0)
	66 len--;
	67 ps->comm[len] = '\0';
	68 memmove(ps->comm, ps->comm + 1, len);
	69 fclose(fp);
	70 return 0;
	71 }
	72
	73 int
	74 parsestatus(pid_t pid, struct procstatus *pstatus)
	75 {
	76 char path[PATH_MAX];
	77 char buf[BUFSIZ], *off;
	78 int fd;
	79 ssize_t n;
	80
	81 snprintf(path, sizeof(path), "/proc/%d/status", pid);
	82 fd = open(path, O_RDONLY);
	83 if (fd < 0)
	84 return -1;
	85 n = read(fd, buf, sizeof(buf) - 1);
	86 if (n < 0)
	87 eprintf("%s: read error:", path);
	88 if (!n) {
	89 close(fd);
	90 return -1;
	91 }
	92 buf[n] = '\0';
	93 close(fd);
	94 off = strstr(buf, "Uid:");
	95 if (!off)
	96 return -1;
	97 sscanf(off, "Uid: %u %u", &pstatus->uid, &pstatus->euid);
	98 off = strstr(buf, "Gid:");
	99 if (!off)
	100 return -1;
	101 sscanf(off, "Gid: %u %u", &pstatus->gid, &pstatus->egid);
	102 return 0;
	103 }
	104
	105 int
	106 pidfile(const char *file)
	107 {
	108 char *end;
	109
	110 errno = 0;
	111 strtol(file, &end, 10);
	112 if (*end != '\0')
	113 return 0;
	114 if (errno != 0)
	115 return 0;
	116 return 1;
	117 }