diff options
Diffstat (limited to 'fetchmail.c')
| -rw-r--r-- | fetchmail.c | 72 |
1 files changed, 71 insertions, 1 deletions
diff --git a/fetchmail.c b/fetchmail.c index 10bff927..c85aec3a 100644 --- a/fetchmail.c +++ b/fetchmail.c @@ -22,6 +22,9 @@ description: main driver module for popclient $Log: fetchmail.c,v $ + Revision 1.3 1996/06/27 19:22:32 esr + Sent to ceharris. + Revision 1.2 1996/06/26 19:08:59 esr This is what I sent Harris. @@ -113,6 +116,7 @@ int outlevel; /* see the O_.* constants in popclient.h */ /* Daemon-mode control */ int poll_interval; /* polling interval for daemon mode */ char *logfile; /* logfile to ship progress reports to */ +int quitmode; /* if -quit was set */ /* args for the MDA, parsed out in the usual fashion by parseMDAargs() */ char *mda_argv [32]; @@ -130,6 +134,9 @@ char *mda_argv [32]; globals: none. *********************************************************************/ +static void termhook(); +static char *lockfile; + main (argc,argv) int argc; char **argv; @@ -140,6 +147,8 @@ char **argv; int parsestatus; char *servername; struct hostrec *hostp, *hostlist = (struct hostrec *)NULL; + FILE *tmpfp; + pid_t pid; if ((parsestatus = parsecmdline(argc,argv,&cmd_opts)) < 0) exit(PS_SYNTAX); @@ -190,11 +199,66 @@ char **argv; exit(PS_SYNTAX); } + /* beyond here we don't want more than one popclient running per user */ + umask(0077); + if ((lockfile = (char *) malloc( strlen(getenv("HOME")) + strlen("/.lockfetch-") + HOSTLEN)) == NULL) { + fprintf(stderr,"popclient: cannot allocate memory for .lockfetch, exiting.\n"); + exit(PS_EXCLUDE); + } + strcpy(lockfile, getenv("HOME")); + strcat(lockfile,"/.lockfetch-"); + gethostname(lockfile+strlen(lockfile),HOSTLEN); + + /* check the lock, maybe remove it */ + if (!quitmode) + { + /* check the lock */ + if ( (tmpfp = fopen(lockfile, "r")) != NULL ) { + fscanf(tmpfp,"%d",&pid); + fprintf(stderr,"Another session appears to be running at pid %d.\nIf you are sure that this is incorrect, remove %s file.\n",pid,lockfile); + fclose(tmpfp); + return(PS_EXCLUDE); + } + + /* if not locked, assert a lock */ + else if ( (tmpfp = fopen(lockfile,"w")) != NULL ) { + signal(SIGABRT, termhook); + signal(SIGINT, termhook); + signal(SIGTERM, termhook); + signal(SIGALRM, termhook); + signal(SIGHUP, termhook); + signal(SIGPIPE, termhook); + signal(SIGQUIT, termhook); + fprintf(tmpfp,"%d",getpid()); + fclose(tmpfp); + } + } + else + { + FILE* fp; + + if ( (fp = fopen(lockfile, "r")) == NULL ) { + fprintf(stderr,"popclient: no other popclient is running\n"); + return(PS_EXCLUDE); + } + + fscanf(fp,"%d",&pid); + fprintf(stderr,"popclient: killing popclient at PID %d\n",pid); + if ( kill(pid,SIGKILL) < 0 ) + fprintf(stderr,"popclient: error killing the process %d\n.",pid); + else + fprintf(stderr,"popclient: popclient at %d is dead.\n", pid); + + fclose(fp); + remove(lockfile); + exit(0); + } + /* * Maybe time to go to demon mode... */ if (poll_interval) - daemonize(logfile); + daemonize(logfile, termhook); /* * Query all hosts. If there's only one, the error return will @@ -209,9 +273,15 @@ char **argv; } while (poll_interval); + termhook(); exit(popstatus); } +void termhook() +{ + unlink(lockfile); +} + int query_host(servername, options) /* perform fetch transaction with single host */ char *servername; |