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