Adding upstream version 2:4.0.4.upstream/2%4.0.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 420 insertions, 0 deletions

diff --git a/src/pidof.c b/src/pidof.c
new file mode 100644
index 0000000..abf9fae
--- /dev/null
+++ b/src/pidof.c
@@ -0,0 +1,420 @@
+/*
+ * pidof.c - Utility for listing pids of running processes
+ *
+ * Copyright © 2013-2023 Craig Small <csmall@dropbear.xyz>
+ * Copyright © 2016-2023 Jim Warner <james.warner@comcast.net>
+ * Copyright © 2015-2020 Jan Rybar <jrybar@redhat.com>
+ * Copyright © 2013      Jaromir Capik <jcapik@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <limits.h>
+#include <sys/types.h>
+
+#include "c.h"
+#include "fileutils.h"
+#include "nls.h"
+#include "xalloc.h"
+
+#include "pids.h"
+
+
+#define grow_size(x) do { \
+	if ((x) < 0 || (size_t)(x) >= INT_MAX / 5 / sizeof(struct el)) \
+		xerrx(EXIT_FAILURE, _("integer overflow")); \
+	(x) = (x) * 5 / 4 + 1024; \
+} while (0)
+
+#define safe_free(x)	if (x) { free(x); x=NULL; }
+
+
+struct el {
+	pid_t pid;
+};
+
+struct el *procs = NULL;
+static int proc_count = 0;
+
+struct el *omitted_procs = NULL;
+static int omit_count = 0;
+
+static char *program = NULL;
+
+/* switch flags */
+static int opt_single_shot    = 0;  /* -s */
+static int opt_scripts_too    = 0;  /* -x */
+static int opt_rootdir_check  = 0;  /* -c */
+static int opt_with_workers   = 0;  /* -w */
+static int opt_threads = 0;	    /* -t */
+static int opt_quiet          = 0;  /* -q */
+
+static char *pidof_root = NULL;
+
+static int __attribute__ ((__noreturn__)) usage(int opt)
+{
+	int err = (opt == '?');
+	FILE *fp = err ? stderr : stdout;
+
+	fputs(USAGE_HEADER, fp);
+	fprintf(fp, _(" %s [options] [program [...]]\n"), program_invocation_short_name);
+	fputs(USAGE_OPTIONS, fp);
+	fputs(_(" -s, --single-shot         return one PID only\n"), fp);
+	fputs(_(" -c, --check-root          omit processes with different root\n"), fp);
+	fputs(_(" -q,                       quiet mode, only set the exit code\n"), fp);
+	fputs(_(" -w, --with-workers        show kernel workers too\n"), fp);
+	fputs(_(" -x                        also find shells running the named scripts\n"), fp);
+	fputs(_(" -o, --omit-pid <PID,...>  omit processes with PID\n"), fp);
+	fputs(_(" -t, --lightweight         list threads too\n"), fp);
+	fputs(_(" -S, --separator SEP       use SEP as separator put between PIDs"), fp);
+	fputs(USAGE_SEPARATOR, fp);
+	fputs(USAGE_HELP, fp);
+	fputs(USAGE_VERSION, fp);
+	fprintf(fp, USAGE_MAN_TAIL("pidof(1)"));
+
+	exit(fp == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
+}
+
+
+static int is_omitted (pid_t pid)
+{
+	int i;
+
+	for (i = 0; i < omit_count; i++) {
+		if (pid == omitted_procs[i].pid) return 1;
+	}
+
+	return 0;
+}
+
+
+static char *get_basename (char *filename)
+{
+	char *pos;
+	char *result;
+
+	pos = result = filename;
+	while (*pos != '\0') {
+		if (*(pos++) == '/') result = pos;
+	}
+
+	return result;
+}
+
+
+static char *pid_link (pid_t pid, const char *base_name)
+{
+	char link [1000];
+	char *result;
+	ssize_t path_alloc_size;
+	ssize_t len;
+
+	snprintf(link, sizeof(link), "/proc/%d/%s", pid, base_name);
+
+	len = path_alloc_size = 0;
+	result = NULL;
+	do {
+		grow_size(path_alloc_size);
+		result = xrealloc(result, path_alloc_size);
+
+		if ((len = readlink(link, result, path_alloc_size)) < 0) {
+			len = 0;
+			break;
+		}
+
+	} while (len == path_alloc_size);
+
+	result[len] = '\0';
+
+	return result;
+}
+
+
+static void select_procs (void)
+{
+	enum pids_item items[] = { PIDS_ID_PID, PIDS_CMD, PIDS_CMDLINE_V };
+	enum rel_items { rel_pid, rel_cmd, rel_cmdline };
+	struct pids_info *info = NULL;
+	struct pids_stack *stack;
+	int match;
+	static int size = 0;
+	char *cmd_arg0, *cmd_arg0base;
+	char *cmd_arg1, *cmd_arg1base;
+	char *program_base;
+	char *root_link;
+	char *exe_link;
+	char *exe_link_base;
+
+	/* get the input base name */
+	program_base = get_basename(program);
+
+	procps_pids_new(&info, items, 3);
+
+	exe_link = root_link = NULL;
+	while ((stack = procps_pids_get(info, (opt_threads
+					       ? PIDS_FETCH_THREADS_TOO
+					       : PIDS_FETCH_TASKS_ONLY)))) {
+		char  *p_cmd     = PIDS_VAL(rel_cmd,     str,   stack, info),
+		     **p_cmdline = PIDS_VAL(rel_cmdline, strv,  stack, info);
+		int    tid       = PIDS_VAL(rel_pid,     s_int, stack, info);
+
+		if (opt_rootdir_check) {
+			/* get the /proc/<pid>/root symlink value */
+			root_link = pid_link(tid, "root");
+			match = !strcmp(pidof_root, root_link);
+			safe_free(root_link);
+
+			if (!match) {  /* root check failed */
+				continue;
+			}
+		}
+
+		if (!is_omitted(tid) && ((p_cmdline && *p_cmdline) || opt_with_workers)) {
+
+			cmd_arg0 = (p_cmdline && *p_cmdline) ? *p_cmdline : "\0";
+
+			/* processes starting with '-' are login shells */
+			if (*cmd_arg0 == '-') {
+				cmd_arg0++;
+			}
+
+			/* get the argv0 base name */
+			cmd_arg0base = get_basename(cmd_arg0);
+
+			/* get the /proc/<pid>/exe symlink value */
+			exe_link = pid_link(tid, "exe");
+
+			/* get the exe_link base name */
+			exe_link_base = get_basename(exe_link);
+
+			match = 0;
+
+			if (!strcmp(program, cmd_arg0base) ||
+			    !strcmp(program_base, cmd_arg0) ||
+			    !strcmp(program, cmd_arg0) ||
+			    (opt_with_workers && !strcmp(program, p_cmd)) ||
+			    !strcmp(program, exe_link_base) ||
+			    !strcmp(program, exe_link))
+			{
+				match = 1;
+
+			} else if (opt_scripts_too && p_cmdline && *(p_cmdline+1)) {
+
+				cmd_arg1 = *(p_cmdline+1);
+
+				/* get the arg1 base name */
+				cmd_arg1base = get_basename(cmd_arg1);
+
+				/* if script, then cmd = argv1, otherwise cmd = argv0 */
+				if (p_cmd &&
+				    !strncmp(p_cmd, cmd_arg1base, strlen(p_cmd)) &&
+				    (!strcmp(program, cmd_arg1base) ||
+				    !strcmp(program_base, cmd_arg1) ||
+				    !strcmp(program, cmd_arg1)))
+				{
+					match = 1;
+				}
+			}
+			/* If there is a space in arg0 then process probably has
+			 * setproctitle so use the cmdline
+			 */
+			if (!match && strchr(cmd_arg0, ' ')) {
+				match = (strcmp(program, p_cmd)==0);
+			}
+
+			safe_free(exe_link);
+
+			if (match) {
+				if (proc_count == size) {
+					grow_size(size);
+					procs = xrealloc(procs, size * (sizeof *procs));
+				}
+				if (procs) {
+					procs[proc_count++].pid = tid;
+				} else {
+					xerrx(EXIT_FAILURE, _("internal error"));
+				}
+			}
+
+		}
+
+	}
+
+	procps_pids_unref(&info);
+}
+
+
+static void add_to_omit_list (char *input_arg)
+{
+	static int omit_size = 0;
+
+	char *omit_str;
+	char *endptr;
+
+	pid_t omit_pid;
+
+	omit_str = NULL;
+	omit_str = strtok(input_arg, ",;:");
+	while (omit_str) {
+
+		if (!strcmp(omit_str,"%PPID")) {  /* keeping this %PPID garbage for backward compatibility only */
+			omit_pid = getppid();     /* ... as it can be replaced with $$ in common shells */
+			endptr = omit_str + sizeof("%PPID") - 1;
+		} else {
+			omit_pid = strtoul(omit_str, &endptr, 10);
+		}
+
+		if (*endptr == '\0') {
+			if (omit_count == omit_size) {
+				grow_size(omit_size);
+				omitted_procs = xrealloc(omitted_procs, omit_size * sizeof(*omitted_procs));
+			}
+			if (omitted_procs) {
+				omitted_procs[omit_count++].pid = omit_pid;
+			} else {
+				xerrx(EXIT_FAILURE, _("internal error"));
+			}
+		} else {
+			xwarnx(_("illegal omit pid value (%s)!\n"), omit_str);
+		}
+
+		omit_str = strtok(NULL, ",;:");
+	}
+}
+
+
+
+int main (int argc, char **argv)
+{
+	int opt;
+	signed int i;
+	int found = 0;
+	int first_pid = 1;
+
+	const char *separator = " ";
+	const char *opts = "scnqxwtmo:S:?Vh";
+
+	static const struct option longopts[] = {
+		{"check-root", no_argument, NULL, 'c'},
+		{"single-shot", no_argument, NULL, 's'},
+		{"omit-pid", required_argument, NULL, 'o'},
+		{"separator", required_argument, NULL, 'S'},
+		{"quiet", no_argument, NULL, 'q'},
+		{"with-workers", no_argument, NULL, 'w'},
+		{"lightweight", no_argument, NULL, 't'},
+		{"help", no_argument, NULL, 'h'},
+		{"version", no_argument, NULL, 'V'},
+		{NULL, 0, NULL, 0}
+	};
+
+#ifdef HAVE_PROGRAM_INVOCATION_NAME
+	program_invocation_name = program_invocation_short_name;
+#endif
+	setlocale (LC_ALL, "");
+	bindtextdomain (PACKAGE, LOCALEDIR);
+	textdomain (PACKAGE);
+	atexit (close_stdout);
+
+	/* process command-line options */
+	while ((opt = getopt_long (argc, argv, opts, longopts, NULL)) != -1) {
+		switch (opt) {
+		case 'q':
+			opt_quiet = 1;
+			/* fallthrough */
+		case 's':
+			opt_single_shot = 1;
+			break;
+		case 'o':
+			add_to_omit_list (optarg);
+			break;
+		case 'x':
+			opt_scripts_too = 1;
+			break;
+		case 'w':
+			opt_with_workers = 1;
+			break;
+		case 'c':
+			if (geteuid() == 0) {
+				opt_rootdir_check = 1;
+				safe_free(pidof_root);
+				pidof_root = pid_link(getpid(), "root");
+			}
+			break;
+		case 't':   // Linux: show threads (lightweight process) too
+			opt_threads = 1;
+			break;
+		case 'd': /* sysv pidof uses this for S */
+		case 'S':
+			separator = optarg;
+			break;
+		case 'V':
+			printf (PROCPS_NG_VERSION);
+			exit (EXIT_SUCCESS);
+		case 'h':
+		case '?':
+			usage (opt);
+			break;
+		/* compatibility-only switches */
+		case 'n': /* avoiding stat(2) on NFS volumes doesn't make any sense anymore ... */
+			  /* ... as this reworked solution does not use stat(2) at all */
+		case 'm': /* omitting relatives with argv[0] & argv[1] matching the argv[0] & argv[1] ...*/
+			  /* ... of explicitly omitted PIDs is too 'expensive' and as we don't know */
+			  /* ... wheter it is still needed, we won't re-implement it unless ... */
+			  /* ... somebody gives us a good reason to do so :) */
+			break;
+		}
+	}
+
+	/* main loop */
+	while (argc - optind) {		/* for each program */
+
+		program = argv[optind++];
+
+		if (*program == '\0') continue;
+
+		select_procs();	/* get the list of matching processes */
+
+		if (proc_count) {
+
+			found = 1;
+			for (i = proc_count - 1; i >= 0; i--) {	/* and display their PIDs */
+				if (!opt_quiet) {
+					if (first_pid) {
+						first_pid = 0;
+						printf ("%ld", (long) procs[i].pid);
+					} else {
+						printf ("%s%ld", separator, (long) procs[i].pid);
+					}
+				}
+				if (opt_single_shot) break;
+			}
+
+			proc_count = 0;
+		}
+	}
+
+	/* final line feed */
+	if (!opt_quiet && found) printf("\n");
+
+	/* some cleaning */
+	safe_free(procs);
+	safe_free(omitted_procs);
+	safe_free(pidof_root);
+
+	return !found;
+}