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/* pgrep.c - pgrep and pkill implementation
*
* Copyright 2012 Madhur Verma <mad.flexi@gmail.com>
* Copyright 2013 Kyungwan Han <asura321@gmail.com>
*
USE_PGREP(NEWTOY(pgrep, "?P# s# xvonlf[!sP]", TOYFLAG_USR|TOYFLAG_BIN))
USE_PGREP(OLDTOY(pkill, pgrep, TOYFLAG_USR|TOYFLAG_BIN))
config PGREP
bool "pgrep"
default n
help
usage: pgrep [-flnovx] [-s SID|-P PPID|PATTERN]
pkill [-l|-SIGNAL] [-fnovx] [-s SID|-P PPID|PATTERN]
-l Show command name too / List all signals
-f Match against entire command line
-n Show/Signal the newest process only
-o Show/Signal the oldest process only
-v Negate the match
-x Match whole name (not substring)
-s Match session ID (0 for current)
-P Match parent process ID
*/
#define FOR_pgrep
#include "toys.h"
GLOBALS(
long sid; //-s
long ppid; //-P
char *signame;
)
static int exec_action(unsigned pid, char *name, int signal)
{
if (toys.which->name[1] == 'g') {
printf("%d", pid);
if (toys.optflags&FLAG_l) printf(" %s", name);
printf("\n");
} else kill(pid, signal);
return 0;
}
static int regex_match(regex_t *rp, char *tar, char *patt)
{
regmatch_t rm[1];
int len = strlen(tar);
if (regexec(rp, tar, 1, rm, 0) == 0) {
if (toys.optflags&FLAG_x) {
if ((rm[0].rm_so == 0) && ((rm[0].rm_eo - rm[0].rm_so) == len)) return 1;
} else return 1;
}
return 0;
}
void pgrep_main(void)
{
int signum = 0, eval = 0, ret = 1;
DIR *dp = 0;
struct dirent *entry = 0;
regex_t rp;
unsigned pid = 0, ppid = 0, sid = 0, latest_pid = 0;
char *cmdline = 0, *latest_cmdline = 0;
pid_t self = getpid();
if (!(dp = opendir("/proc"))) perror_exit("OPENDIR: failed to open /proc");
setlinebuf(stdout);
// pkill
if (toys.which->name[1] == 'k') {
if (toys.optflags&FLAG_l) {
sig_to_num(0);
return;
}
// note: "pkill -" on ubuntu uses "-" as the pattern, this would error instead
if (*toys.optargs && **toys.optargs == '-') {
char *arg;
int i = strtol(TT.signame = *(toys.optargs++)+1, &arg, 10);
if (!*arg) arg = num_to_sig(i);
else arg = TT.signame;
if (!arg || (signum = sig_to_num(arg)) == -1)
error_exit("Unknown signal '%s'", arg);
} else signum = SIGTERM;
}
if (!(toys.optflags&(FLAG_s|FLAG_P)) && !*toys.optargs)
help_exit("missing argument");
if (toys.optargs[1] && !(toys.optflags&(FLAG_s|FLAG_P)))
help_exit("max argument > 1");
if (*toys.optargs) { /* compile regular expression(PATTERN) */
if ((eval = regcomp(&rp, *toys.optargs, REG_EXTENDED | REG_NOSUB)) != 0) {
char errbuf[256];
(void) regerror(eval, &rp, errbuf, sizeof(errbuf));
error_exit("%s", errbuf);
}
}
if ((toys.optflags&FLAG_s) && !TT.sid) TT.sid = getsid(0);
while ((entry = readdir(dp))) {
int fd = -1, n = 0;
if (!isdigit(*entry->d_name)) continue;
pid = strtol(entry->d_name, NULL, 10);
if (pid == self) continue;
snprintf(toybuf, sizeof(toybuf), "/proc/%s/cmdline", entry->d_name);
if ((fd = open(toybuf, O_RDONLY)) == -1) goto cmdline_fail;
n = read(fd, toybuf, sizeof(toybuf));
close(fd);
toybuf[n--] = '\0';
if (n < 0) {
cmdline_fail:
snprintf(toybuf, sizeof(toybuf), "/proc/%s/comm", entry->d_name);
if ((fd = open(toybuf, O_RDONLY)) == -1) continue;
n = read(fd, toybuf, sizeof(toybuf));
close(fd);
toybuf[--n] = '\0';
if (n < 1) continue;
}
if (toys.optflags & FLAG_f) {
while (--n)
if (toybuf[n] < ' ') toybuf[n] = ' ';
}
if (cmdline) free(cmdline);
cmdline = xstrdup(toybuf);
if (toys.optflags&(FLAG_s|FLAG_P)) {
snprintf(toybuf, sizeof(toybuf), "/proc/%s/stat", entry->d_name);
if ((fd = open(toybuf, O_RDONLY)) == -1) continue;
n = read(fd, toybuf, sizeof(toybuf));
close(fd);
if (n<1) continue;
n = sscanf(toybuf, "%*u %*s %*c %u %*u %u", &ppid, &sid);
if ((toys.optflags&FLAG_s) && sid != TT.sid) continue;
if ((toys.optflags&FLAG_P) && ppid != TT.ppid) continue;
}
if (!*toys.optargs || (regex_match(&rp, cmdline, *toys.optargs)^!!(toys.optflags&FLAG_v))) {
if (toys.optflags&FLAG_n) {
if (latest_cmdline) free(latest_cmdline);
latest_cmdline = xstrdup(cmdline);
latest_pid = pid;
} else exec_action(pid, cmdline, signum);
ret = 0;
if (toys.optflags&FLAG_o) break;
}
}
if (cmdline) free(cmdline);
if (latest_cmdline) {
exec_action(latest_pid, latest_cmdline, signum);
free(latest_cmdline);
}
if (*toys.optargs) regfree(&rp);
closedir(dp);
toys.exitval = ret;
}
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