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/* |
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util.C -- process management and other utility functions |
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|
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Some of these are taken from tinc, see the AUTHORS file. |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#include "config.h" |
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|
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#include <cstdio> |
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#include <cstring> |
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|
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#include <errno.h> |
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#include <signal.h> |
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#include <sys/types.h> |
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#include <sys/wait.h> |
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#include <unistd.h> |
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#include <time.h> |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <arpa/inet.h> |
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|
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|
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#include <sys/mman.h> |
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|
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#include "gettext.h" |
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#include "pidfile.h" |
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#include "dropin.h" |
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|
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#include "global.h" |
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#include "conf.h" |
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#include "util.h" |
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#include "slog.h" |
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|
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int |
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write_pidfile (void) |
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{ |
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int pid; |
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|
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pid = check_pid (pidfilename); |
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|
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if (pid) |
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{ |
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fprintf (stderr, _("A vped is already running with pid %d.\n"), pid); |
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return 1; |
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} |
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|
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/* if it's locked, write-protected, or whatever */ |
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if (!write_pid (pidfilename)) |
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return 1; |
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|
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return 0; |
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} |
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|
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int |
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kill_other (int signal) |
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{ |
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int pid; |
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|
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pid = read_pid (pidfilename); |
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|
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if (!pid) |
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{ |
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fprintf (stderr, _("No other vped is running.\n")); |
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return 1; |
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} |
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|
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errno = 0; /* No error, sometimes errno is only changed on error */ |
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|
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/* ESRCH is returned when no process with that pid is found */ |
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if (kill (pid, signal) && errno == ESRCH) |
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{ |
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fprintf (stderr, _("The vped is no longer running. ")); |
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|
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fprintf (stderr, _("Removing stale lock file.\n")); |
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remove_pid (pidfilename); |
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} |
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|
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return 0; |
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} |
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|
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int |
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detach (int do_detach) |
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{ |
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/* First check if we can open a fresh new pidfile */ |
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|
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if (write_pidfile ()) |
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return -1; |
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|
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/* If we succeeded in doing that, detach */ |
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|
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log_to (0); |
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|
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if (do_detach) |
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{ |
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if (daemon (0, 0) < 0) |
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{ |
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log_to (LOGTO_SYSLOG | LOGTO_STDERR); |
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|
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slog (L_ERR, _("couldn't detach from terminal: %s"), strerror (errno)); |
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return -1; |
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} |
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|
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/* Now UPDATE the pid in the pidfile, because we changed it... */ |
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|
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if (!write_pid (pidfilename)) |
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return -1; |
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|
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log_to (LOGTO_SYSLOG); |
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} |
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else |
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log_to (LOGTO_SYSLOG | LOGTO_STDERR); |
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|
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slog (L_INFO, _("vped %s (%s %s) starting"), VERSION, __DATE__, __TIME__); |
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|
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return 0; |
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} |
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|
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void |
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make_names (void) |
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{ |
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if (!pidfilename) |
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pidfilename = LOCALSTATEDIR "/run/vped.pid"; |
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|
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if (!confbase) |
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asprintf (&confbase, "%s/vpe", CONFDIR); |
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} |
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|
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void run_script (const run_script_cb &cb, bool wait) |
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{ |
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int pid; |
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|
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if ((pid = fork ()) == 0) |
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{ |
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char *filename; |
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asprintf (&filename, "%s/%s", confbase, cb(0)); |
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execl (filename, filename, (char *) 0); |
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exit (255); |
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} |
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else if (pid > 0) |
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{ |
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if (wait) |
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{ |
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waitpid (pid, 0, 0); |
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/* TODO: check status */ |
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} |
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} |
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} |
