pgrep,pkill: new applets by Loic Grenie <loic.grenie@gmail.com>

1 files changed, 136 insertions, 0 deletions

diff --git a/procps/pgrep.c b/procps/pgrep.c
new file mode 100644
index 0000000..3bf087f
--- /dev/null
+++ b/procps/pgrep.c
@@ -0,0 +1,136 @@
+/* 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 <getopt.h>
+
+#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);
+int pgrep_main(int argc, 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;
+		if (first_arg[0] != '-' || first_arg[1] < 'a' || first_arg[1] > 'z') {
+			argv[first_arg_idx] = NULL;
+			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_and_exit();
+		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_last);
+				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 */
+}