118 lines
2.3 KiB
C
118 lines
2.3 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "../proc.h"
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#include "../util.h"
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int
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parsecmdline(pid_t pid, char *buf, size_t siz)
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{
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int fd;
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char path[PATH_MAX];
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ssize_t n, i;
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snprintf(path, sizeof(path), "/proc/%ld/cmdline", (long)pid);
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return -1;
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n = read(fd, buf, siz > 0 ? siz - 1 : 0);
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if (n < 0) {
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weprintf("read %s:", path);
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close(fd);
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return -1;
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}
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if (!n) {
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close(fd);
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return -1;
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}
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buf[n] = '\0';
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for (i = 0; i < n; i++)
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if (buf[i] == '\0')
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buf[i] = ' ';
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close(fd);
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return 0;
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}
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int
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parsestat(pid_t pid, struct procstat *ps)
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{
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char path[PATH_MAX];
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FILE *fp;
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size_t len;
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snprintf(path, sizeof(path), "/proc/%d/stat", pid);
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if (!(fp = fopen(path, "r")))
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return -1;
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fscanf(fp, "%d %s %c %d %d %d %d %d %u %lu %lu %lu %lu %lu %lu",
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&ps->pid, ps->comm,
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&ps->state, &ps->ppid, &ps->pgrp,
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&ps->sid, &ps->tty_nr, &ps->tpgid, &ps->flags,
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&ps->minflt, &ps->cminflt, &ps->majflt, &ps->cmajflt,
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&ps->utime, &ps->stime);
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fscanf(fp, "%ld %ld %ld %ld %ld %ld %llu %lu %ld %ld",
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&ps->cutime, &ps->cstime, &ps->priority, &ps->nice,
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&ps->num_threads, &ps->itrealvalue, &ps->starttime,
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&ps->vsize, &ps->rss, &ps->rsslim);
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/* Filter out '(' and ')' from comm */
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if ((len = strlen(ps->comm)) > 0)
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len--;
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ps->comm[len] = '\0';
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memmove(ps->comm, ps->comm + 1, len);
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fclose(fp);
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return 0;
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}
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int
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parsestatus(pid_t pid, struct procstatus *pstatus)
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{
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char path[PATH_MAX];
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char buf[BUFSIZ], *off;
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int fd;
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ssize_t n;
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snprintf(path, sizeof(path), "/proc/%d/status", pid);
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return -1;
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n = read(fd, buf, sizeof(buf) - 1);
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if (n < 0)
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eprintf("%s: read error:", path);
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if (!n) {
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close(fd);
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return -1;
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}
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buf[n] = '\0';
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close(fd);
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off = strstr(buf, "Uid:");
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if (!off)
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return -1;
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sscanf(off, "Uid: %u %u", &pstatus->uid, &pstatus->euid);
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off = strstr(buf, "Gid:");
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if (!off)
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return -1;
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sscanf(off, "Gid: %u %u", &pstatus->gid, &pstatus->egid);
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return 0;
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}
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int
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pidfile(const char *file)
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{
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char *end;
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errno = 0;
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strtol(file, &end, 10);
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if (*end != '\0')
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return 0;
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if (errno != 0)
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return 0;
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return 1;
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}
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