diff options
Diffstat (limited to 'tools/start-stop-daemon.c')
| -rw-r--r-- | tools/start-stop-daemon.c | 1062 |
1 files changed, 1062 insertions, 0 deletions
diff --git a/tools/start-stop-daemon.c b/tools/start-stop-daemon.c new file mode 100644 index 0000000..9f566bd --- /dev/null +++ b/tools/start-stop-daemon.c @@ -0,0 +1,1062 @@ +// SPDX-License-Identifier: NONE +/* + * A rewrite of the original Debian's start-stop-daemon Perl script + * in C (faster - it is executed many times during system startup). + * + * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>, + * public domain. Based conceptually on start-stop-daemon.pl, by Ian + * Jackson <ijackson@gnu.ai.mit.edu>. May be used and distributed + * freely for any purpose. Changes by Christian Schwarz + * <schwarz@monet.m.isar.de>, to make output conform to the Debian + * Console Message Standard, also placed in public domain. Minor + * changes by Klee Dienes <klee@debian.org>, also placed in the Public + * Domain. + * + * Changes by Ben Collins <bcollins@debian.org>, added --chuid, --background + * and --make-pidfile options, placed in public domain aswell. + * + * Port to OpenBSD by Sontri Tomo Huynh <huynh.29@osu.edu> + * and Andreas Schuldei <andreas@schuldei.org> + * + * Changes by Ian Jackson: added --retry (and associated rearrangements). + * + * Modified for Gentoo rc-scripts by Donny Davies <woodchip@gentoo.org>: + * I removed the BSD/Hurd/OtherOS stuff, added #include <stddef.h> + * and stuck in a #define VERSION "1.9.18". Now it compiles without + * the whole automake/config.h dance. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#ifdef HAVE_LXC +#define _GNU_SOURCE +#include <sched.h> +#endif /* HAVE_LXC */ + +#include <stddef.h> +#undef VERSION +#define VERSION "1.9.18" + +#define MIN_POLL_INTERVAL 20000 /*us*/ + +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <stdarg.h> +#include <signal.h> +#include <sys/stat.h> +#include <dirent.h> +#include <sys/time.h> +#include <sys/queue.h> +#include <unistd.h> +#include <getopt.h> +#include <pwd.h> +#include <grp.h> +#include <sys/ioctl.h> +#include <sys/types.h> +#include <termios.h> +#include <fcntl.h> +#include <limits.h> +#include <assert.h> +#include <ctype.h> +#ifdef linux +#include <linux/sched.h> +#endif + +static int testmode = 0; +static int quietmode = 0; +static int exitnodo = 1; +static int start = 0; +static int stop = 0; +static int background = 0; +static int mpidfile = 0; +static int signal_nr = 15; +static const char *signal_str = NULL; +static int user_id = -1; +static int runas_uid = -1; +static int runas_gid = -1; +static const char *userspec = NULL; +static char *changeuser = NULL; +static const char *changegroup = NULL; +static char *changeroot = NULL; +static const char *cmdname = NULL; +static char *execname = NULL; +static char *startas = NULL; +static const char *pidfile = NULL; +static char what_stop[1024]; +static const char *schedule_str = NULL; +static const char *progname = ""; +static int nicelevel = 0; + +static struct stat exec_stat; + +struct pid_list { + struct pid_list *next; + pid_t pid; +}; + +static struct pid_list *found = NULL; +static struct pid_list *killed = NULL; + +struct schedule_item { + enum { sched_timeout, sched_signal, sched_goto, sched_forever } type; + int value; /* seconds, signal no., or index into array */ + /* sched_forever is only seen within parse_schedule and callees */ +}; + +static int schedule_length; +static struct schedule_item *schedule = NULL; + +LIST_HEAD(namespace_head, namespace); + +struct namespace +{ + LIST_ENTRY(namespace) list; + const char *path; + int nstype; +}; + +static struct namespace_head namespace_head; + +static void *xmalloc(int size); +static void push(struct pid_list **list, pid_t pid); +static void do_help(void); +static void parse_options(int argc, char *const *argv); +static int pid_is_user(pid_t pid, uid_t uid); +static int pid_is_cmd(pid_t pid, const char *name); +static void check(pid_t pid); +static void do_pidfile(const char *name); +static void do_stop(int signal_nr, int quietmode, int *n_killed, + int *n_notkilled, int retry_nr); +static int pid_is_exec(pid_t pid, const struct stat *esb); + +#ifdef __GNUC__ +static void fatal(const char *format, ...) + __attribute__((noreturn, format(printf, 1, 2))); +static void badusage(const char *msg) __attribute__((noreturn)); +#else +static void fatal(const char *format, ...); +static void badusage(const char *msg); +#endif + +/* This next part serves only to construct the TVCALC macro, which + * is used for doing arithmetic on struct timeval's. It works like this: + * TVCALC(result, expression); + * where result is a struct timeval (and must be an lvalue) and + * expression is the single expression for both components. In this + * expression you can use the special values TVELEM, which when fed a + * const struct timeval* gives you the relevant component, and + * TVADJUST. TVADJUST is necessary when subtracting timevals, to make + * it easier to renormalise. Whenver you subtract timeval elements, + * you must make sure that TVADJUST is added to the result of the + * subtraction (before any resulting multiplication or what have you). + * TVELEM must be linear in TVADJUST. + */ +typedef long tvselector(const struct timeval *); +static long tvselector_sec(const struct timeval *tv) +{ + return tv->tv_sec; +} +static long tvselector_usec(const struct timeval *tv) +{ + return tv->tv_usec; +} +#define TVCALC_ELEM(result, expr, sec, adj) \ + { \ + const long TVADJUST = adj; \ + long (*const TVELEM)(const struct timeval *) = \ + tvselector_##sec; \ + (result).tv_##sec = (expr); \ + } +#define TVCALC(result, expr) \ + do { \ + TVCALC_ELEM(result, expr, sec, (-1)); \ + TVCALC_ELEM(result, expr, usec, (+1000000)); \ + (result).tv_sec += (result).tv_usec / 1000000; \ + (result).tv_usec %= 1000000; \ + } while (0) + + +static void fatal(const char *format, ...) +{ + va_list arglist; + + fprintf(stderr, "%s: ", progname); + va_start(arglist, format); + vfprintf(stderr, format, arglist); + va_end(arglist); + putc('\n', stderr); + exit(2); +} + + +static void *xmalloc(int size) +{ + void *ptr; + + ptr = malloc(size); + if (ptr) + return ptr; + fatal("malloc(%d) failed", size); +} + +static void xgettimeofday(struct timeval *tv) +{ + if (gettimeofday(tv, 0) != 0) + fatal("gettimeofday failed: %s", strerror(errno)); +} + +static void push(struct pid_list **list, pid_t pid) +{ + struct pid_list *p; + + p = xmalloc(sizeof(*p)); + p->next = *list; + p->pid = pid; + *list = p; +} + +static void clear(struct pid_list **list) +{ + struct pid_list *here, *next; + + for (here = *list; here != NULL; here = next) { + next = here->next; + free(here); + } + + *list = NULL; +} + +#ifdef linux +static const char *next_dirname(const char *s) +{ + const char *cur; + + cur = s; + + if (*cur != '\0') { + for (; *cur != '/'; ++cur) + if (*cur == '\0') + return cur; + + for (; *cur == '/'; ++cur) + ; + } + + return cur; +} + +static void add_namespace(const char *path) +{ + int nstype; + const char *nsdirname, *nsname, *cur; + struct namespace *namespace; + + cur = path; + nsdirname = nsname = ""; + + while ((cur = next_dirname(cur))[0] != '\0') { + nsdirname = nsname; + nsname = cur; + } + + if (!strncmp(nsdirname, "ipcns/", strlen("ipcns/"))) + nstype = CLONE_NEWIPC; + else if (!strncmp(nsdirname, "netns/", strlen("netns/"))) + nstype = CLONE_NEWNET; + else if (!strncmp(nsdirname, "utcns/", strlen("utcns/"))) + nstype = CLONE_NEWUTS; + else + badusage("invalid namepspace path"); + + namespace = xmalloc(sizeof(*namespace)); + namespace->path = path; + namespace->nstype = nstype; + LIST_INSERT_HEAD(&namespace_head, namespace, list); +} +#endif + +#ifdef HAVE_LXC +static void set_namespaces(void) +{ + struct namespace *namespace; + int fd; + + LIST_FOREACH (namespace, &namespace_head, list) { + if ((fd = open(namespace->path, O_RDONLY)) == -1) + fatal("open namespace %s: %s", namespace->path, + strerror(errno)); + if (setns(fd, namespace->nstype) == -1) + fatal("setns %s: %s", namespace->path, strerror(errno)); + } +} +#else +static void set_namespaces(void) +{ + if (!LIST_EMPTY(&namespace_head)) + fatal("LCX namespaces not supported"); +} +#endif + +static void do_help(void) +{ + printf("start-stop-daemon " VERSION + " for Debian - small and fast C version written by\n" + "Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>, public domain.\n" + "\n" + "Usage:\n" + " start-stop-daemon -S|--start options ... -- arguments ...\n" + " start-stop-daemon -K|--stop options ...\n" + " start-stop-daemon -H|--help\n" + " start-stop-daemon -V|--version\n" + "\n" + "Options (at least one of --exec|--pidfile|--user is required):\n" + " -x|--exec <executable> program to start/check if it is running\n" + " -p|--pidfile <pid-file> pid file to check\n" + " -c|--chuid <name|uid[:group|gid]>\n" + " change to this user/group before starting process\n" + " -u|--user <username>|<uid> stop processes owned by this user\n" + " -n|--name <process-name> stop processes with this name\n" + " -s|--signal <signal> signal to send (default TERM)\n" + " -a|--startas <pathname> program to start (default is <executable>)\n" + " -N|--nicelevel <incr> add incr to the process's nice level\n" + " -b|--background force the process to detach\n" + " -m|--make-pidfile create the pidfile before starting\n" + " -R|--retry <schedule> check whether processes die, and retry\n" + " -t|--test test mode, don't do anything\n" + " -o|--oknodo exit status 0 (not 1) if nothing done\n" + " -q|--quiet be more quiet\n" + " -v|--verbose be more verbose\n" + "Retry <schedule> is <item>|/<item>/... where <item> is one of\n" + " -<signal-num>|[-]<signal-name> send that signal\n" + " <timeout> wait that many seconds\n" + " forever repeat remainder forever\n" + "or <schedule> may be just <timeout>, meaning <signal>/<timeout>/KILL/<timeout>\n" + "\n" + "Exit status: 0 = done 1 = nothing done (=> 0 if --oknodo)\n" + " 3 = trouble 2 = with --retry, processes wouldn't die\n"); +} + + +static void badusage(const char *msg) +{ + if (msg) + fprintf(stderr, "%s: %s\n", progname, msg); + fprintf(stderr, "Try `%s --help' for more information.\n", progname); + exit(3); +} + +struct sigpair { + const char *name; + int signal; +}; + +const struct sigpair siglist[] = { + {"ABRT", SIGABRT}, {"ALRM", SIGALRM}, {"FPE", SIGFPE}, + {"HUP", SIGHUP}, {"ILL", SIGILL}, {"INT", SIGINT}, + {"KILL", SIGKILL}, {"PIPE", SIGPIPE}, {"QUIT", SIGQUIT}, + {"SEGV", SIGSEGV}, {"TERM", SIGTERM}, {"USR1", SIGUSR1}, + {"USR2", SIGUSR2}, {"CHLD", SIGCHLD}, {"CONT", SIGCONT}, + {"STOP", SIGSTOP}, {"TSTP", SIGTSTP}, {"TTIN", SIGTTIN}, + {"TTOU", SIGTTOU}}; + +static int parse_integer(const char *string, int *value_r) +{ + unsigned long ul; + char *ep; + + if (!string[0]) + return -1; + + ul = strtoul(string, &ep, 10); + if (ul > INT_MAX || *ep != '\0') + return -1; + + *value_r = ul; + return 0; +} + +static int parse_signal(const char *signal_str, int *signal_nr) +{ + unsigned int i; + + if (parse_integer(signal_str, signal_nr) == 0) + return 0; + + for (i = 0; i < sizeof(siglist) / sizeof(siglist[0]); i++) { + if (strcmp(signal_str, siglist[i].name) == 0) { + *signal_nr = siglist[i].signal; + return 0; + } + } + return -1; +} + +static void parse_schedule_item(const char *string, struct schedule_item *item) +{ + const char *after_hyph; + + if (!strcmp(string, "forever")) { + item->type = sched_forever; + } else if (isdigit((unsigned char)string[0])) { + item->type = sched_timeout; + if (parse_integer(string, &item->value) != 0) + badusage("invalid timeout value in schedule"); + } else if ((after_hyph = string + (string[0] == '-')) + && parse_signal(after_hyph, &item->value) == 0) { + item->type = sched_signal; + } else { + badusage( + "invalid schedule item (must be [-]<signal-name>, -<signal-number>, <timeout> or `forever'"); + } +} + +static void parse_schedule(const char *schedule_str) +{ + char item_buf[20]; + const char *slash; + int count, repeatat; + ptrdiff_t str_len; + + count = 0; + for (slash = schedule_str; *slash; slash++) + if (*slash == '/') + count++; + + schedule_length = (count == 0) ? 4 : count + 1; + schedule = xmalloc(sizeof(*schedule) * schedule_length); + + if (count == 0) { + schedule[0].type = sched_signal; + schedule[0].value = signal_nr; + parse_schedule_item(schedule_str, &schedule[1]); + if (schedule[1].type != sched_timeout) { + badusage( + "--retry takes timeout, or schedule list of at least two items"); + } + schedule[2].type = sched_signal; + schedule[2].value = SIGKILL; + schedule[3] = schedule[1]; + } else { + count = 0; + repeatat = -1; + while (schedule_str != NULL) { + slash = strchr(schedule_str, '/'); + str_len = slash ? slash - schedule_str + : (ptrdiff_t)strlen(schedule_str); + if (str_len >= (ptrdiff_t)sizeof(item_buf)) + badusage( + "invalid schedule item: far too long (you must delimit items with slashes)"); + memcpy(item_buf, schedule_str, str_len); + item_buf[str_len] = 0; + schedule_str = slash ? slash + 1 : NULL; + + parse_schedule_item(item_buf, &schedule[count]); + if (schedule[count].type == sched_forever) { + if (repeatat >= 0) + badusage( + "invalid schedule: `forever' appears more than once"); + repeatat = count; + continue; + } + count++; + } + if (repeatat >= 0) { + schedule[count].type = sched_goto; + schedule[count].value = repeatat; + count++; + } + assert(count == schedule_length); + } +} + +static void parse_options(int argc, char *const *argv) +{ + static struct option longopts[] = { + {"help", 0, NULL, 'H'}, {"stop", 0, NULL, 'K'}, + {"start", 0, NULL, 'S'}, {"version", 0, NULL, 'V'}, + {"startas", 1, NULL, 'a'}, {"name", 1, NULL, 'n'}, + {"oknodo", 0, NULL, 'o'}, {"pidfile", 1, NULL, 'p'}, + {"quiet", 0, NULL, 'q'}, {"signal", 1, NULL, 's'}, + {"test", 0, NULL, 't'}, {"user", 1, NULL, 'u'}, + {"chroot", 1, NULL, 'r'}, {"namespace", 1, NULL, 'd'}, + {"verbose", 0, NULL, 'v'}, {"exec", 1, NULL, 'x'}, + {"chuid", 1, NULL, 'c'}, {"nicelevel", 1, NULL, 'N'}, + {"background", 0, NULL, 'b'}, {"make-pidfile", 0, NULL, 'm'}, + {"retry", 1, NULL, 'R'}, {NULL, 0, NULL, 0}}; + int c; + + for (;;) { + c = getopt_long(argc, argv, + "HKSVa:n:op:qr:d:s:tu:vx:c:N:bmR:", longopts, + (int *)0); + if (c == -1) + break; + switch (c) { + case 'H': /* --help */ + do_help(); + exit(0); + case 'K': /* --stop */ + stop = 1; + break; + case 'S': /* --start */ + start = 1; + break; + case 'V': /* --version */ + printf("start-stop-daemon " VERSION "\n"); + exit(0); + case 'a': /* --startas <pathname> */ + startas = optarg; + break; + case 'n': /* --name <process-name> */ + cmdname = optarg; + break; + case 'o': /* --oknodo */ + exitnodo = 0; + break; + case 'p': /* --pidfile <pid-file> */ + pidfile = optarg; + break; + case 'q': /* --quiet */ + quietmode = 1; + break; + case 's': /* --signal <signal> */ + signal_str = optarg; + break; + case 't': /* --test */ + testmode = 1; + break; + case 'u': /* --user <username>|<uid> */ + userspec = optarg; + break; + case 'v': /* --verbose */ + quietmode = -1; + break; + case 'x': /* --exec <executable> */ + execname = optarg; + break; + case 'c': /* --chuid <username>|<uid> */ + changeuser = strtok(optarg, ":"); + changegroup = strtok(NULL, ":"); + break; + case 'r': /* --chroot /new/root */ + changeroot = optarg; + break; + case 'd': /* --namespace /.../<ipcns>|<netns>|<utsns>/name */ +#ifdef linux + add_namespace(optarg); +#endif + break; + case 'N': /* --nice */ + nicelevel = atoi(optarg); + break; + case 'b': /* --background */ + background = 1; + break; + case 'm': /* --make-pidfile */ + mpidfile = 1; + break; + case 'R': /* --retry <schedule>|<timeout> */ + schedule_str = optarg; + break; + default: + badusage(NULL); /* message printed by getopt */ + } + } + + if (signal_str != NULL) { + if (parse_signal(signal_str, &signal_nr) != 0) + badusage( + "signal value must be numeric or name of signal (KILL, INTR, ...)"); + } + + if (schedule_str != NULL) { + parse_schedule(schedule_str); + } + + if (start == stop) + badusage("need one of --start or --stop"); + + if (!execname && !pidfile && !userspec && !cmdname) + badusage( + "need at least one of --exec, --pidfile, --user or --name"); + + if (!startas) + startas = execname; + + if (start && !startas) + badusage("--start needs --exec or --startas"); + + if (mpidfile && pidfile == NULL) + badusage("--make-pidfile is only relevant with --pidfile"); + + if (background && !start) + badusage("--background is only relevant with --start"); +} + +static int pid_is_exec(pid_t pid, const struct stat *esb) +{ + struct stat sb; + char buf[PATH_MAX]; + + snprintf(buf, sizeof(buf), "/proc/%ld/exe", (long)pid); + if (stat(buf, &sb) != 0) + return 0; + return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino); +} + + +static int pid_is_user(pid_t pid, uid_t uid) +{ + struct stat sb; + char buf[PATH_MAX]; + + snprintf(buf, sizeof(buf), "/proc/%ld", (long)pid); + if (stat(buf, &sb) != 0) + return 0; + return (sb.st_uid == uid); +} + + +static int pid_is_cmd(pid_t pid, const char *name) +{ + char buf[PATH_MAX]; + FILE *f; + int c; + + snprintf(buf, sizeof(buf), "/proc/%ld/stat", (long)pid); + f = fopen(buf, "r"); + if (!f) + return 0; + while ((c = getc(f)) != EOF && c != '(') + ; + if (c != '(') { + fclose(f); + return 0; + } + /* this hopefully handles command names containing ')' */ + while ((c = getc(f)) != EOF && c == *name) + name++; + fclose(f); + return (c == ')' && *name == '\0'); +} + + +static void check(pid_t pid) +{ + if (execname && !pid_is_exec(pid, &exec_stat)) + return; + if (userspec && !pid_is_user(pid, user_id)) + return; + if (cmdname && !pid_is_cmd(pid, cmdname)) + return; + push(&found, pid); +} + +static void do_pidfile(const char *name) +{ + FILE *f; + long pid; + + f = fopen(name, "r"); + if (f) { + if (fscanf(f, "%ld", &pid) == 1) + check((pid_t)pid); + fclose(f); + } else if (errno != ENOENT) + fatal("open pidfile %s: %s", name, strerror(errno)); +} + +/* WTA: this needs to be an autoconf check for /proc/pid existance. + */ +static void do_procinit(void) +{ + DIR *procdir; + struct dirent *entry; + int foundany; + long pid; + + procdir = opendir("/proc"); + if (!procdir) + fatal("opendir /proc: %s", strerror(errno)); + + foundany = 0; + while ((entry = readdir(procdir)) != NULL) { + if (sscanf(entry->d_name, "%ld", &pid) != 1) + continue; + foundany++; + check((pid_t)pid); + } + closedir(procdir); + if (!foundany) + fatal("nothing in /proc - not mounted?"); +} + +static void do_findprocs(void) +{ + clear(&found); + + if (pidfile) + do_pidfile(pidfile); + else + do_procinit(); +} + +/* return 1 on failure */ +static void do_stop(int signal_nr, int quietmode, int *n_killed, + int *n_notkilled, int retry_nr) +{ + struct pid_list *p; + + do_findprocs(); + + *n_killed = 0; + *n_notkilled = 0; + + if (!found) + return; + + clear(&killed); + + for (p = found; p; p = p->next) { + if (testmode) + printf("Would send signal %d to %ld.\n", signal_nr, + (long)p->pid); + else if (kill(p->pid, signal_nr) == 0) { + push(&killed, p->pid); + (*n_killed)++; + } else { + printf("%s: warning: failed to kill %ld: %s\n", + progname, (long)p->pid, strerror(errno)); + (*n_notkilled)++; + } + } + if (quietmode < 0 && killed) { + printf("Stopped %s (pid", what_stop); + for (p = killed; p; p = p->next) + printf(" %ld", (long)p->pid); + putchar(')'); + if (retry_nr > 0) + printf(", retry #%d", retry_nr); + printf(".\n"); + } +} + + +static void set_what_stop(const char *str) +{ + strncpy(what_stop, str, sizeof(what_stop)); + what_stop[sizeof(what_stop) - 1] = '\0'; +} + +static int run_stop_schedule(void) +{ + int r, position, n_killed, n_notkilled, value, ratio, anykilled, + retry_nr; + struct timeval stopat, before, after, interval, maxinterval; + + if (testmode) { + if (schedule != NULL) { + printf("Ignoring --retry in test mode\n"); + schedule = NULL; + } + } + + if (cmdname) + set_what_stop(cmdname); + else if (execname) + set_what_stop(execname); + else if (pidfile) + sprintf(what_stop, "process in pidfile `%.200s'", pidfile); + else if (userspec) + sprintf(what_stop, "process(es) owned by `%.200s'", userspec); + else + fatal("internal error, please report"); + + anykilled = 0; + retry_nr = 0; + n_killed = 0; + + if (schedule == NULL) { + do_stop(signal_nr, quietmode, &n_killed, &n_notkilled, 0); + if (n_notkilled > 0 && quietmode <= 0) + printf("%d pids were not killed\n", n_notkilled); + if (n_killed) + anykilled = 1; + goto x_finished; + } + + for (position = 0; position < schedule_length;) { + value = schedule[position].value; + n_notkilled = 0; + + switch (schedule[position].type) { + + case sched_goto: + position = value; + continue; + + case sched_signal: + do_stop(value, quietmode, &n_killed, &n_notkilled, + retry_nr++); + if (!n_killed) + goto x_finished; + else + anykilled = 1; + goto next_item; + + case sched_timeout: + /* We want to keep polling for the processes, to see if + * they've exited, + * or until the timeout expires. + * + * This is a somewhat complicated algorithm to try to + * ensure that we + * notice reasonably quickly when all the processes have + * exited, but + * don't spend too much CPU time polling. In + * particular, on a fast + * machine with quick-exiting daemons we don't want to + * delay system + * shutdown too much, whereas on a slow one, or where + * processes are + * taking some time to exit, we want to increase the + * polling + * interval. + * + * The algorithm is as follows: we measure the elapsed + * time it takes + * to do one poll(), and wait a multiple of this time + * for the next + * poll. However, if that would put us past the end of + * the timeout + * period we wait only as long as the timeout period, + * but in any case + * we always wait at least MIN_POLL_INTERVAL (20ms). + * The multiple + * (`ratio') starts out as 2, and increases by 1 for + * each poll to a + * maximum of 10; so we use up to between 30% and 10% of + * the + * machine's resources (assuming a few reasonable things + * about system + * performance). + */ + xgettimeofday(&stopat); + stopat.tv_sec += value; + ratio = 1; + for (;;) { + xgettimeofday(&before); + if (timercmp(&before, &stopat, >)) + goto next_item; + + do_stop(0, 1, &n_killed, &n_notkilled, 0); + if (!n_killed) + goto x_finished; + + xgettimeofday(&after); + + if (!timercmp(&after, &stopat, <)) + goto next_item; + + if (ratio < 10) + ratio++; + + TVCALC(interval, + ratio * (TVELEM(&after) - TVELEM(&before) + + TVADJUST)); + TVCALC(maxinterval, + TVELEM(&stopat) - TVELEM(&after) + + TVADJUST); + + if (timercmp(&interval, &maxinterval, >)) + interval = maxinterval; + + if (interval.tv_sec == 0 + && interval.tv_usec <= MIN_POLL_INTERVAL) + interval.tv_usec = MIN_POLL_INTERVAL; + + r = select(0, 0, 0, 0, &interval); + if (r < 0 && errno != EINTR) + fatal("select() failed for pause: %s", + strerror(errno)); + } + + case sched_forever: + assert(!"schedule[].type value must be valid"); + } + + next_item: + position++; + } + + if (quietmode <= 0) + printf("Program %s, %d process(es), refused to die.\n", + what_stop, n_killed); + + return 2; + +x_finished: + if (!anykilled) { + if (quietmode <= 0) + printf("No %s found running; none killed.\n", + what_stop); + return exitnodo; + } else { + return 0; + } +} + +/* +int main(int argc, char **argv) NONRETURNING; +*/ + +int main(int argc, char **argv) +{ + progname = argv[0]; + + LIST_INIT(&namespace_head); + + parse_options(argc, argv); + argc -= optind; + argv += optind; + + if (execname && stat(execname, &exec_stat)) + fatal("stat %s: %s", execname, strerror(errno)); + + if (userspec && sscanf(userspec, "%d", &user_id) != 1) { + struct passwd *pw; + + pw = getpwnam(userspec); + if (!pw) + fatal("user `%s' not found\n", userspec); + + user_id = pw->pw_uid; + } + + if (changegroup && sscanf(changegroup, "%d", &runas_gid) != 1) { + struct group *gr = getgrnam(changegroup); + if (!gr) + fatal("group `%s' not found\n", changegroup); + runas_gid = gr->gr_gid; + } + if (changeuser && sscanf(changeuser, "%d", &runas_uid) != 1) { + struct passwd *pw = getpwnam(changeuser); + if (!pw) + fatal("user `%s' not found\n", changeuser); + runas_uid = pw->pw_uid; + if (changegroup + == NULL) { /* pass the default group of this user */ + changegroup = ""; /* just empty */ + runas_gid = pw->pw_gid; + } + } + + if (stop) { + int i = run_stop_schedule(); + exit(i); + } + + do_findprocs(); + + if (found) { + if (quietmode <= 0) + printf("%s already running.\n", execname); + exit(exitnodo); + } + if (testmode) { + printf("Would start %s ", startas); + while (argc-- > 0) + printf("%s ", *argv++); + if (changeuser != NULL) { + printf(" (as user %s[%d]", changeuser, runas_uid); + if (changegroup != NULL) + printf(", and group %s[%d])", changegroup, + runas_gid); + else + printf(")"); + } + if (changeroot != NULL) + printf(" in directory %s", changeroot); + if (nicelevel) + printf(", and add %i to the priority", nicelevel); + printf(".\n"); + exit(0); + } + if (quietmode < 0) + printf("Starting %s...\n", startas); + *--argv = startas; + if (changeroot != NULL) { + if (chdir(changeroot) < 0) + fatal("Unable to chdir() to %s", changeroot); + if (chroot(changeroot) < 0) + fatal("Unable to chroot() to %s", changeroot); + } + if (changeuser != NULL) { + if (setgid(runas_gid)) + fatal("Unable to set gid to %d", runas_gid); + if (initgroups(changeuser, runas_gid)) + fatal("Unable to set initgroups() with gid %d", + runas_gid); + if (setuid(runas_uid)) + fatal("Unable to set uid to %s", changeuser); + } + + if (background) { /* ok, we need to detach this process */ + int i, fd; + if (quietmode < 0) + printf("Detaching to start %s...", startas); + i = fork(); + if (i < 0) { + fatal("Unable to fork.\n"); + } + if (i) { /* parent */ + if (quietmode < 0) + printf("done.\n"); + exit(0); + } + /* child continues here */ + /* now close all extra fds */ + for (i = getdtablesize() - 1; i >= 0; --i) + close(i); + /* change tty */ + fd = open("/dev/tty", O_RDWR); + if (fd >= 0) { + if (ioctl(fd, TIOCNOTTY, 0) < 0) + printf("ioctl TIOCNOTTY failed: %s\n", + strerror(errno)); + close(fd); + } + chdir("/"); + umask(022); /* set a default for dumb programs */ + setpgid(0, 0); /* set the process group */ + fd = open("/dev/null", O_RDWR); /* stdin */ + if (fd >= 0) { + dup(fd); /* stdout */ + dup(fd); /* stderr */ + } + } + if (nicelevel) { + errno = 0; + if (nice(nicelevel) < 0 && errno) + fatal("Unable to alter nice level by %i: %s", nicelevel, + strerror(errno)); + } + if (mpidfile + && pidfile != NULL) { /* user wants _us_ to make the pidfile :) */ + FILE *pidf = fopen(pidfile, "w"); + pid_t pidt = getpid(); + if (pidf == NULL) + fatal("Unable to open pidfile `%s' for writing: %s", + pidfile, strerror(errno)); + fprintf(pidf, "%ld\n", (long)pidt); + fclose(pidf); + } + set_namespaces(); + execv(startas, argv); + fatal("Unable to start %s: %s", startas, strerror(errno)); +} |