fetchmail - [fork] set imap idle timeout to 600s, some servers don't follow rfc recommendations

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Diffstat (limited to 'sink.c')

0 files changed, 0 insertions, 0 deletions

/* * lock.c -- cross-platform concurrency locking for fetchmail * * For license terms, see the file COPYING in this directory. */ #include "config.h" #include <stdio.h> #ifdef HAVE_STRING_H #include <string.h> /* strcat() */ #endif #if defined(STDC_HEADERS) #include <stdlib.h> #endif #if defined(HAVE_UNISTD_H) #include <unistd.h> #endif #include <errno.h> #include <fcntl.h> #include <signal.h> #include "fetchmail.h" #include "i18n.h" static char *lockfile; /* name of lockfile */ static int lock_acquired; /* have we acquired a lock */ void lock_setup(void) /* set up the global lockfile name */ { /* set up to do lock protocol */ #define FETCHMAIL_PIDFILE "fetchmail.pid" if (getuid() == ROOT_UID) { lockfile = (char *)xmalloc( sizeof(PID_DIR) + sizeof(FETCHMAIL_PIDFILE) + 1); strcpy(lockfile, PID_DIR); strcat(lockfile, "/"); strcat(lockfile, FETCHMAIL_PIDFILE); } else { lockfile = (char *)xmalloc(strlen(fmhome)+sizeof(FETCHMAIL_PIDFILE)+2); strcpy(lockfile, fmhome); strcat(lockfile, "/"); if (fmhome == home) strcat(lockfile, "."); strcat(lockfile, FETCHMAIL_PIDFILE); } #undef FETCHMAIL_PIDFILE } static void unlockit(void) /* must-do actions for exit (but we can't count on being able to do malloc) */ { if (lockfile && lock_acquired) unlink(lockfile); } void lock_dispose(void) /* arrange for a lock to be removed on process exit */ { #ifdef HAVE_ATEXIT atexit(unlockit); #endif } int lock_state(void) { int pid, st; FILE *lockfp; int bkgd = FALSE; if ((lockfp = fopen(lockfile, "r")) != NULL) { int args = fscanf(lockfp, "%d %d", &pid, &st); bkgd = (args == 2); if (ferror(lockfp)) { fprintf(stderr, GT_("fetchmail: error reading lockfile \"%s\": %s\n"), lockfile, strerror(errno)); exit(PS_EXCLUDE); } if (args == 0 || kill(pid, 0) == -1) { pid = 0; if (unlink(lockfile)) { if (errno != ENOENT) { perror(lockfile); } } else { fprintf(stderr,GT_("fetchmail: removing stale lockfile\n")); } } fclose(lockfp); /* not checking should be safe, file mode was "r" */ } else { pid = 0; if (errno != ENOENT) { fprintf(stderr, GT_("fetchmail: error opening lockfile \"%s\": %s\n"), lockfile, strerror(errno)); exit(PS_EXCLUDE); } } return(bkgd ? -pid : pid); } void lock_assert(void) /* assert that we already posess a lock */ { lock_acquired = TRUE; } void lock_or_die(void) /* get a lock on a given host or exit */ { int fd; char tmpbuf[50]; if (!lock_acquired) { int e = 0; if ((fd = open(lockfile, O_WRONLY|O_CREAT|O_EXCL, 0666)) != -1) { snprintf(tmpbuf, sizeof(tmpbuf), "%ld\n", (long)getpid()); if (write(fd, tmpbuf, strlen(tmpbuf)) < strlen(tmpbuf)) e = 1; if (run.poll_interval) { snprintf(tmpbuf, sizeof(tmpbuf), "%d\n", run.poll_interval); if (write(fd, tmpbuf, strlen(tmpbuf)) < strlen(tmpbuf)) e = 1; } if (fsync(fd)) e = 1; if (close(fd)) e = 1; } else { e = 1; } if (e == 0) { lock_acquired = TRUE; } else { perror(lockfile); fprintf(stderr, GT_("fetchmail: lock creation failed.\n")); exit(PS_EXCLUDE); } } } void fm_lock_release(void) /* release a lock on a given host */ { unlink(lockfile); } /* lock.c ends here */


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