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

	Commit message (Collapse)	Author	Age	Files	Lines
*	Add files from ESR's dev directory that weren't under version control	Rob Funk	2004-06-08	1	-0/+597
	svn path=/trunk/; revision=3881

/* * daemon.c -- turn a process into a daemon under POSIX, SYSV, BSD. * * For license terms, see the file COPYING in this directory. */ #include <config.h> #include <stdio.h> #include <errno.h> #include <signal.h> #include <sys/types.h> #include <sys/wait.h> #include <sys/fcntl.h> /* Solaris 2.5 requires this */ #include <sys/stat.h> /* get umask(2) prototyped */ #if defined(HAVE_UNISTD_H) #include <unistd.h> #endif #if defined(STDC_HEADERS) #include <stdlib.h> #endif #if defined(QNX) #include <unix.h> #endif #if defined(HAVE_SGTTY_H) # include <sgtty.h> /* for TIOCNOTTY under NEXTSTEP */ #endif /* BSD portability hack */ #if !defined(SIGCHLD) && defined(SIGCLD) #define SIGCHLD SIGCLD #endif #include "fetchmail.h" #include "tunable.h" RETSIGTYPE sigchld_handler (int sig) /* process SIGCHLD to obtain the exit code of the terminating process */ { pid_t pid; #if defined(HAVE_UNION_WAIT) union wait status; #else int status; #endif #if defined(HAVE_WAIT3) #ifdef oldhpux /* HP-UX fixed this sometime between 9.01 and 10.20 */ while ((pid = wait3(&status, WNOHANG, (int *) 0)) > 0) #else while ((pid = wait3(&status, WNOHANG, (struct rusage *) 0)) > 0) #endif ; /* swallow 'em up. */ #elif defined(HAVE_WAITPID) while ((pid = waitpid(-1, &status, WNOHANG)) > 0) ; /* swallow 'em up. */ #else /* Zooks! Nothing to do but wait(), and hope we don't block... */ wait(&status); #endif } int daemonize (const char *logfile, void (*termhook)(int)) /* detach from control TTY, become process group leader, catch SIGCHLD */ { int fd; pid_t childpid; RETSIGTYPE sigchld_handler(); /* if we are started by init (process 1) via /etc/inittab we needn't bother to detach from our process group context */ if (getppid() == 1) goto nottyDetach; /* Ignore BSD terminal stop signals */ #ifdef SIGTTOU signal(SIGTTOU, SIG_IGN); #endif #ifdef SIGTTIN signal(SIGTTIN, SIG_IGN); #endif #ifdef SIGTSTP signal(SIGTSTP, SIG_IGN); #endif /* In case we were not started in the background, fork and let the parent exit. Guarantees that the child is not a process group leader */ if ((childpid = fork()) < 0) { error(0, errno, "fork"); return(PS_IOERR); } else if (childpid > 0) exit(0); /* parent */ /* Make ourselves the leader of a new process group with no controlling terminal */ #if defined(HAVE_SETSID) /* POSIX */ /* POSIX makes this soooo easy to do */ if (setsid() < 0) { error(0, errno, "setsid"); return(PS_IOERR); } #elif defined(SIGTSTP) /* BSD */ /* change process group */ setpgrp(0, getpid()); /* lose controlling tty */ if ((fd = open("/dev/tty", O_RDWR)) >= 0) { ioctl(fd, TIOCNOTTY, (char *) 0); close(fd); } #else /* SVR3 and older */ /* change process group */ setpgrp(); /* lose controlling tty */ signal(SIGHUP, SIG_IGN); if ((childpid = fork()) < 0) { error(0, errno, "fork"); return(PS_IOERR); } else if (childpid > 0) { exit(0); /* parent */ } #endif nottyDetach: /* Close any/all open file descriptors */ #if defined(HAVE_GETDTABLESIZE) for (fd = getdtablesize()-1; fd >= 0; fd--) #elif defined(NOFILE) for (fd = NOFILE-1; fd >= 0; fd--) #else /* make an educated guess */ for (fd = 19; fd >= 0; fd--) #endif { close(fd); } /* Reopen stdin descriptor on /dev/null */ if ((fd = open("/dev/null", O_RDWR)) < 0) { /* stdin */ error(0, errno, "open: /dev/null"); return(PS_IOERR); } if (logfile) fd = open(logfile, O_CREAT|O_WRONLY|O_APPEND, 0666); /* stdout */ else if (dup(fd) < 0) { /* stdout */ error(0, errno, "dup"); return(PS_IOERR); } if (dup(fd) < 0) { /* stderr */ error(0, errno, "dup"); return(PS_IOERR); } /* move to root directory, so we don't prevent filesystem unmounts */ chdir("/"); /* set our umask to something reasonable (we hope) */ #if defined(DEF_UMASK) umask(DEF_UMASK); #else umask(022); #endif /* set up to catch child process termination signals */ signal(SIGCHLD, sigchld_handler); #if defined(SIGPWR) signal(SIGPWR, sigchld_handler); #endif return(0); } /* daemon.c ends here */