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/* vi: set sw=4 ts=4: */
/*
* Mini pgrep/pkill implementation for busybox
*
* Copyright (C) 2007 Loic Grenie <loic.grenie@gmail.com>
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#include "libbb.h"
#include "xregex.h"
/* Idea taken from kill.c */
#define pgrep (ENABLE_PGREP && applet_name[1] == 'g')
#define pkill (ENABLE_PKILL && applet_name[1] == 'k')
enum {
/* "vlfxon" */
PGREPOPTBIT_V = 0, /* must be first, we need OPT_INVERT = 0/1 */
PGREPOPTBIT_L,
PGREPOPTBIT_F,
PGREPOPTBIT_X,
PGREPOPTBIT_O,
PGREPOPTBIT_N,
};
#define OPT_INVERT (opt & (1 << PGREPOPTBIT_V))
#define OPT_LIST (opt & (1 << PGREPOPTBIT_L))
#define OPT_FULL (opt & (1 << PGREPOPTBIT_F))
#define OPT_ANCHOR (opt & (1 << PGREPOPTBIT_X))
#define OPT_FIRST (opt & (1 << PGREPOPTBIT_O))
#define OPT_LAST (opt & (1 << PGREPOPTBIT_N))
static void act(unsigned pid, char *cmd, int signo, unsigned opt)
{
if (pgrep) {
if (OPT_LIST)
printf("%d %s\n", pid, cmd);
else
printf("%d\n", pid);
} else
kill(pid, signo);
}
int pgrep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int pgrep_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
unsigned pid = getpid();
int signo = SIGTERM;
unsigned opt;
int scan_mask = PSSCAN_COMM;
char *first_arg;
int first_arg_idx;
int matched_pid;
char *cmd_last;
procps_status_t *proc;
/* These are initialized to 0 */
struct {
regex_t re_buffer;
regmatch_t re_match[1];
} Z;
#define re_buffer (Z.re_buffer)
#define re_match (Z.re_match )
memset(&Z, 0, sizeof(Z));
/* We must avoid interpreting -NUM (signal num) as an option */
first_arg_idx = 1;
while (1) {
first_arg = argv[first_arg_idx];
if (!first_arg)
break;
/* not "-<small_letter>..."? */
if (first_arg[0] != '-' || first_arg[1] < 'a' || first_arg[1] > 'z') {
argv[first_arg_idx] = NULL; /* terminate argv here */
break;
}
first_arg_idx++;
}
opt = getopt32(argv, "vlfxon");
argv[first_arg_idx] = first_arg;
argv += optind;
//argc -= optind; - unused anyway
if (OPT_FULL)
scan_mask |= PSSCAN_ARGVN;
if (pkill) {
if (OPT_LIST) { /* -l: print the whole signal list */
print_signames();
return 0;
}
if (first_arg && first_arg[0] == '-') {
signo = get_signum(&first_arg[1]);
if (signo < 0) /* || signo > MAX_SIGNUM ? */
bb_error_msg_and_die("bad signal name '%s'", &first_arg[1]);
argv++;
}
}
/* One pattern is required */
if (!argv[0] || argv[1])
bb_show_usage();
xregcomp(&re_buffer, argv[0], 0);
matched_pid = 0;
cmd_last = NULL;
proc = NULL;
while ((proc = procps_scan(proc, scan_mask)) != NULL) {
char *cmd;
if (proc->pid == pid)
continue;
cmd = proc->argv0;
if (!cmd)
cmd = proc->comm;
/* NB: OPT_INVERT is always 0 or 1 */
if ((regexec(&re_buffer, cmd, 1, re_match, 0) == 0 /* match found */
&& (!OPT_ANCHOR || (re_match[0].rm_so == 0 && re_match[0].rm_eo == strlen(cmd)))) ^ OPT_INVERT
) {
matched_pid = proc->pid;
if (OPT_LAST) {
free(cmd_last);
cmd_last = xstrdup(cmd);
continue;
}
act(proc->pid, cmd, signo, opt);
if (OPT_FIRST)
break;
}
}
if (cmd_last) {
act(matched_pid, cmd_last, signo, opt);
if (ENABLE_FEATURE_CLEAN_UP)
free(cmd_last);
}
return matched_pid == 0; /* return 1 if no processes listed/signaled */
}
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