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// SPDX-License-Identifier: GPL-2.0-only
/*
* chproc.c - simple process checker
*
* Iterate over /proc and print PIDs of processes matching the given name.
*/
#include <stdio.h>
#include <sys/types.h>
#include <dirent.h>
#include <ctype.h>
#include <sys/stat.h>
#include <unistd.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <getopt.h>
#include <signal.h>
#include <stdbool.h>
#define PROGRAM_NAME "chproc"
struct options {
int list;
int all;
int kill;
char *process_name;
char *process_pid;
};
static void options_init(struct options *x)
{
x->list = false;
x->all = false;
x->kill = false;
x->process_pid = NULL;
x->process_name = NULL;
}
static void usage(void)
{
fprintf(stderr,
"Usage: %s <option> [process_name, pid]\n"
" -l, --list <name> list all pid for that process\n"
" -a, --all list all processes\n"
" -k, --kill <PID> kill a proces give then PID\n"
, PROGRAM_NAME);
}
static int process_list(DIR *dir,
const char *proc_name,
struct options *x)
{
char path[PATH_MAX];
char buffer[256];
char *endptr;
FILE *f;
int count;
long pid;
struct dirent *entry;
size_t len;
count = 0;
while ((entry = readdir(dir)) != NULL) {
/* skip "." and ".." */
if (strcmp(entry->d_name, ".") == 0)
continue;
if (strcmp(entry->d_name, "..") == 0)
continue;
pid = strtol(entry->d_name, &endptr, 10);
if (*endptr != '\0') /* not a pure number */
continue;
snprintf(path, sizeof(path), "/proc/%ld/comm", pid);
f = fopen(path, "r");
if (!f) {
fprintf(stderr, "Failed to open %s: %s\n",
path, strerror(errno));
continue;
}
if (!(fgets(buffer, sizeof(buffer), f)))
continue;
len = strlen(buffer);
if (len > 0 && buffer[len-1] == '\n')
buffer[len-1] = '\0';
/* flag instead of re-writing a function */
if (x->list) {
if (strcmp(buffer, proc_name) == 0) {
printf("%s - %s\n", entry->d_name, buffer);
++count;
}
} else {
printf("%s - %s\n", entry->d_name, buffer);
++count;
}
fclose(f);
}
closedir(dir);
if (count == 0)
return 1;
else
return 0;
}
static int process_kill(const char *process_id)
{
pid_t pid;
if (atoi(process_id) < 1) {
fprintf(stderr, "'%s': not a pid or valid job\n", process_id);
usage();
return 1;
}
pid = (pid_t) atoi(process_id);
if (kill(pid, SIGTERM) == -1) {
perror("kill failed");
return 1;
}
printf("Process '%d' killed.\n", pid);
return 0;
}
int main(int argc, char *argv[])
{
int opt;
DIR *dir_proc;
struct options x;
struct option long_options[] = {
{"list", required_argument, 0, 'l'},
{"all", no_argument, 0, 'a'},
{"kill", required_argument, 0, 'k'},
{0, 0, 0, 0}
};
options_init(&x);
/* /proc/ must to exist */
dir_proc = opendir("/proc");
if (dir_proc == NULL) {
fprintf(stderr, "/proc/ not found.\n");
return EXIT_FAILURE;
}
if (argc < 2) {
usage();
return 2;
}
while ((opt = getopt_long(argc, argv, "l:k:a",
long_options, NULL)) != -1) {
switch (opt) {
case 'l':
x.list = true;
x.process_name = optarg;
break;
case 'a':
x.all = true;
break;
case 'k':
x.kill = true;
x.process_pid = optarg;
break;
default:
fprintf(stderr,
"Unknow option.\n");
usage();
exit(2);
}
}
if (x.list || x.all)
if (process_list(dir_proc, x.process_name, &x) == 1)
return 1;
if (x.kill)
if (process_kill(x.process_pid) == 1)
return 1;
return 0;
}
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