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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 {
/* "vlfxons:P:" */
OPTBIT_V = 0, /* must be first, we need OPT_INVERT = 0/1 */
OPTBIT_L,
OPTBIT_F,
OPTBIT_X,
OPTBIT_O,
OPTBIT_N,
OPTBIT_S,
OPTBIT_P,
};
#define OPT_INVERT (opt & (1 << OPTBIT_V))
#define OPT_LIST (opt & (1 << OPTBIT_L))
#define OPT_FULL (opt & (1 << OPTBIT_F))
#define OPT_ANCHOR (opt & (1 << OPTBIT_X))
#define OPT_FIRST (opt & (1 << OPTBIT_O))
#define OPT_LAST (opt & (1 << OPTBIT_N))
#define OPT_SID (opt & (1 << OPTBIT_S))
#define OPT_PPID (opt & (1 << OPTBIT_P))
static void act(unsigned pid, char *cmd, int signo)
{
if (pgrep) {
if (option_mask32 & (1 << OPTBIT_L)) /* 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 UNUSED_PARAM, char **argv)
{
unsigned pid;
int signo;
unsigned opt;
int scan_mask;
int matched_pid;
int sid2match, ppid2match;
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));
/* Parse -SIGNAL for pkill. Must be first option, if present */
signo = SIGTERM;
if (pkill && argv[1] && argv[1][0] == '-') {
int temp = get_signum(argv[1]+1);
if (temp != -1) {
signo = temp;
argv++;
}
}
/* Parse remaining options */
ppid2match = -1;
sid2match = -1;
opt_complementary = "s+:P+"; /* numeric opts */
opt = getopt32(argv, "vlfxons:P:", &sid2match, &ppid2match);
argv += optind;
if (pkill && OPT_LIST) { /* -l: print the whole signal list */
print_signames();
return 0;
}
pid = getpid();
if (sid2match == 0)
sid2match = getsid(pid);
scan_mask = PSSCAN_COMM | PSSCAN_ARGV0;
if (OPT_FULL)
scan_mask |= PSSCAN_ARGVN;
/* One pattern is required, if no -s and no -P */
if ((sid2match & ppid2match) < 0 && (!argv[0] || argv[1]))
bb_show_usage();
if (argv[0])
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;
} else {
int i = proc->argv_len;
while (--i >= 0) {
if ((unsigned char)cmd[i] < ' ')
cmd[i] = ' ';
}
}
if (ppid2match >= 0 && ppid2match != proc->ppid)
continue;
if (sid2match >= 0 && sid2match != proc->sid)
continue;
/* NB: OPT_INVERT is always 0 or 1 */
if (!argv[0]
|| (regexec(&re_buffer, cmd, 1, re_match, 0) == 0 /* match found */
&& (!OPT_ANCHOR || (re_match[0].rm_so == 0 && re_match[0].rm_eo == (regoff_t)strlen(cmd)))
) ^ OPT_INVERT
) {
matched_pid = proc->pid;
if (OPT_LAST) {
free(cmd_last);
cmd_last = xstrdup(cmd);
continue;
}
act(proc->pid, cmd, signo);
if (OPT_FIRST)
break;
}
}
if (cmd_last) {
act(matched_pid, cmd_last, signo);
if (ENABLE_FEATURE_CLEAN_UP)
free(cmd_last);
}
return matched_pid == 0; /* return 1 if no processes listed/signaled */
}
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