*
* Copyright (C) 2007 Loic Grenie <loic.grenie@gmail.com>
*
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config PGREP
+//config: bool "pgrep (6.8 kb)"
+//config: default y
+//config: help
+//config: Look for processes by name.
+//config:
+//config:config PKILL
+//config: bool "pkill (7.6 kb)"
+//config: default y
+//config: help
+//config: Send signals to processes by name.
+
+//applet:IF_PGREP(APPLET_ODDNAME(pgrep, pgrep, BB_DIR_USR_BIN, BB_SUID_DROP, pgrep))
+// APPLET_ODDNAME:name main location suid_type help
+//applet:IF_PKILL(APPLET_ODDNAME(pkill, pgrep, BB_DIR_USR_BIN, BB_SUID_DROP, pkill))
+/* can't be noexec: can find _itself_ under wrong name, since after fork only,
+ * /proc/PID/cmdline and comm are wrong! Can fix comm (prctl(PR_SET_NAME)),
+ * but cmdline?
+ */
+
+//kbuild:lib-$(CONFIG_PGREP) += pgrep.o
+//kbuild:lib-$(CONFIG_PKILL) += pgrep.o
+
+//usage:#define pgrep_trivial_usage
+//usage: "[-flanovx] [-s SID|-P PPID|PATTERN]"
+//usage:#define pgrep_full_usage "\n\n"
+//usage: "Display process(es) selected by regex PATTERN\n"
+//usage: "\n -l Show command name too"
+//usage: "\n -a Show command line too"
+//usage: "\n -f Match against entire command line"
+//usage: "\n -n Show the newest process only"
+//usage: "\n -o Show the oldest process only"
+//usage: "\n -v Negate the match"
+//usage: "\n -x Match whole name (not substring)"
+//usage: "\n -s Match session ID (0 for current)"
+//usage: "\n -P Match parent process ID"
+//usage:
+//usage:#define pkill_trivial_usage
+//usage: "[-l|-SIGNAL] [-fnovx] [-s SID|-P PPID|PATTERN]"
+//usage:#define pkill_full_usage "\n\n"
+//usage: "Send a signal to process(es) selected by regex PATTERN\n"
+//usage: "\n -l List all signals"
+//usage: "\n -f Match against entire command line"
+//usage: "\n -n Signal the newest process only"
+//usage: "\n -o Signal the oldest process only"
+//usage: "\n -v Negate the match"
+//usage: "\n -x Match whole name (not substring)"
+//usage: "\n -s Match session ID (0 for current)"
+//usage: "\n -P Match parent process ID"
#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')
+#define pgrep (ENABLE_PGREP && (!ENABLE_PKILL || applet_name[1] == 'g'))
+#define pkill (ENABLE_PKILL && (!ENABLE_PGREP || 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,
+ /* "vlafxons:+P:+" */
+ OPTBIT_V = 0, /* must be first, we need OPT_INVERT = 0/1 */
+ OPTBIT_L,
+ OPTBIT_A,
+ OPTBIT_F,
+ OPTBIT_X,
+ OPTBIT_O,
+ OPTBIT_N,
+ OPTBIT_S,
+ OPTBIT_P,
};
-#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))
+#define OPT_INVERT (opt & (1 << OPTBIT_V))
+#define OPT_LIST (opt & (1 << OPTBIT_L))
+#define OPT_LISTFULL (opt & (1 << OPTBIT_A))
+#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, unsigned opt)
+static void act(unsigned pid, char *cmd, int signo)
{
if (pgrep) {
- if (OPT_LIST)
- printf("%d %s\n", pid, cmd);
+ if (option_mask32 & ((1 << OPTBIT_L)|(1 << OPTBIT_A))) /* -l or -a */
+ printf("%u %s\n", pid, cmd);
else
- printf("%d\n", pid);
+ printf("%u\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)
+int pgrep_main(int argc UNUSED_PARAM, char **argv)
{
- unsigned pid = getpid();
- int signo = SIGTERM;
+ unsigned pid;
+ int signo;
unsigned opt;
- int scan_mask = PSSCAN_COMM;
- char *first_arg;
- int first_arg_idx;
+ int scan_mask;
int matched_pid;
+ int sid2match, ppid2match;
char *cmd_last;
procps_status_t *proc;
/* These are initialized to 0 */
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;
+ /* 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++;
}
- first_arg_idx++;
}
- opt = getopt32(argv, "vlfxon");
- argv[first_arg_idx] = first_arg;
+ /* Parse remaining options */
+ ppid2match = -1;
+ sid2match = -1;
+ opt = getopt32(argv, "vlafxons:+P:+", &sid2match, &ppid2match);
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++;
- }
+ if (pkill && OPT_LIST) { /* -l: print the whole signal list */
+ print_signames();
+ return 0;
}
- /* One pattern is required */
- if (!argv[0] || argv[1])
+ 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();
- xregcomp(&re_buffer, argv[0], 0);
+ if (argv[0])
+ xregcomp(&re_buffer, argv[0], OPT_ANCHOR ? REG_EXTENDED : (REG_EXTENDED|REG_NOSUB));
+
matched_pid = 0;
cmd_last = NULL;
proc = NULL;
while ((proc = procps_scan(proc, scan_mask)) != NULL) {
char *cmd;
+ int cmdlen, match;
+
if (proc->pid == pid)
continue;
+
+ if (!OPT_INVERT) {
+ /* Quickly reject -sN -PN mismatches... unless -v */
+ if (ppid2match >= 0 && ppid2match != proc->ppid)
+ continue;
+ if (sid2match >= 0 && sid2match != proc->sid)
+ continue;
+ }
+
+ cmdlen = -1;
cmd = proc->argv0;
- if (!cmd)
+ if (!cmd) {
cmd = proc->comm;
+ } else {
+ int i = proc->argv_len;
+
+ if (!OPT_LISTFULL)
+ cmdlen = strlen(cmd); /* not -a: find first NUL */
+ /*
+ * "sleep 11" looks like "sleep""\0""11""\0" in argv0.
+ * Make sure last "\0" does not get converted to " ":
+ */
+ if (i && cmd[i-1] == '\0')
+ i--;
+ while (--i >= 0) {
+ if ((unsigned char)cmd[i] < ' ')
+ cmd[i] = ' ';
+ }
+ }
+
+ if (OPT_INVERT) {
+ /* "pgrep -v -P1 firefox" means "not (ppid=1 AND name=firefox)"
+ * or equivalently "ppid!=1 OR name!=firefox".
+ * Check the first condition and if true, skip matching.
+ */
+ if (ppid2match >= 0 && ppid2match != proc->ppid)
+ goto got_it;
+ if (sid2match >= 0 && sid2match != proc->sid)
+ goto got_it;
+ }
+
+ match = !argv[0]; /* if no PATTERN, then it's a match, else... */
+ if (!match) {
+ again:
+ match = (regexec(&re_buffer, cmd, 1, re_match, 0) == 0);
+ if (!match && cmd != proc->comm) {
+ /* if argv[] did not match, try comm */
+ cmdlen = -1;
+ cmd = proc->comm;
+ goto again;
+ }
+ if (match && OPT_ANCHOR) {
+ /* -x requires full string match */
+ match = (re_match[0].rm_so == 0 && cmd[re_match[0].rm_eo] == '\0');
+ }
+ }
+
/* 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
- ) {
+ if (match ^ OPT_INVERT) {
+ got_it:
matched_pid = proc->pid;
if (OPT_LAST) {
free(cmd_last);
cmd_last = xstrdup(cmd);
continue;
}
- act(proc->pid, cmd, signo, opt);
+ if (cmdlen >= 0)
+ cmd[cmdlen] = '\0';
+ act(proc->pid, cmd, signo);
if (OPT_FIRST)
break;
}
}
+
if (cmd_last) {
- act(matched_pid, cmd_last, signo, opt);
+ act(matched_pid, cmd_last, signo);
if (ENABLE_FEATURE_CLEAN_UP)
free(cmd_last);
}
projects / oweals / busybox.git / blobdiff