-/* Copyright 1993-95 by Carl Harris, Jr. Copyright 1996 by Eric S. Raymond
- * All rights reserved.
+/*
+ * daemon.c -- turn a process into a daemon under POSIX, SYSV, BSD.
+ *
* For license terms, see the file COPYING in this directory.
*/
-
-/***********************************************************************
- module: daemon
- project: popclient
- programmer: Carl Harris, ceharris@mal.com
- description: This module contains all of the code needed to
- turn a process into a daemon for POSIX, SysV, and
- BSD systems.
-
- ***********************************************************************/
-
-
-#include <config.h>
+#include "config.h"
#include <stdio.h>
-#include <sys/types.h>
-#include <sys/file.h>
+#include <errno.h>
#include <signal.h>
+#include <sys/types.h>
+#ifdef HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+#ifdef HAVE_FCNTL_H
#include <fcntl.h>
+#else /* !HAVE_FCNTL_H */
+#ifdef HAVE_SYS_FCNTL_H
+#include <sys/fcntl.h>
+#endif /* HAVE_SYS_FCNTL_H */
+#endif /* !HAVE_FCNTL_H */
+#include <sys/stat.h> /* get umask(2) prototyped */
-#if defined(HAVE_SYS_WAIT_H)
-# include <sys/wait.h>
+#if defined(HAVE_UNISTD_H)
+#include <unistd.h>
#endif
-#if defined(HAVE_UNISTD_H)
-# include <unistd.h>
+#if defined(STDC_HEADERS)
+#include <stdlib.h>
#endif
+#if defined(QNX)
+#include <unix.h>
+#endif
-#include "popclient.h"
+#if !defined(HAVE_SETSID) && defined(SIGTSTP)
+#if defined(HAVE_TERMIOS_H)
+# include <termios.h> /* for TIOCNOTTY under Linux */
+#endif
-static void (*my_termhook)(void);
+#if !defined(TIOCNOTTY) && defined(HAVE_SGTTY_H)
+# include <sgtty.h> /* for TIOCNOTTY under NEXTSTEP */
+#endif
+#endif /* !defined(HAVE_SETSID) && defined(SIGTSTP) */
-/******************************************************************
- function: sigchld_handler
- description: Process the SIGCHLD (a.k.a SIGCLD) signal by calling
- a wait() variant to obtain the exit code of the
- terminating process.
- arguments: none.
- ret. value: none (or undefined if REGSIGTYPE is int).
- globals: none.
- calls: none.
- *****************************************************************/
+/* BSD portability hack */
+#if !defined(SIGCHLD) && defined(SIGCLD)
+#define SIGCHLD SIGCLD
+#endif
+
+#include "fetchmail.h"
+#include "tunable.h"
RETSIGTYPE
-sigchld_handler ()
+sigchld_handler (int sig)
+/* process SIGCHLD to obtain the exit code of the terminating process */
{
- pid_t pid;
+ pid_t pid;
+
+#if defined(HAVE_WAITPID) /* the POSIX way */
+ int status;
-#if defined(HAVE_UNION_WAIT)
- union wait status;
+ while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
+ continue; /* swallow 'em up. */
+#elif defined(HAVE_WAIT3) /* the BSD way */
+#if defined(HAVE_UNION_WAIT) && !defined(__FreeBSD__)
+ union wait status;
#else
- int status;
+ int status;
#endif
- if (my_termhook)
- (*my_termhook)();
-
-#if defined(HAVE_WAIT3)
- while ((pid = wait3(&status, WNOHANG, (struct rusage *) 0)) > 0)
- ; /* swallow 'em up. */
-#elif defined(HAVE_WAITPID)
- while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
- ; /* swallow 'em up. */
+ while ((pid = wait3(&status, WNOHANG, 0)) > 0)
+ continue; /* swallow 'em up. */
#else /* Zooks! Nothing to do but wait(), and hope we don't block... */
- wait(&status);
-#endif
+ int status;
+ wait(&status);
+#endif
}
-
-
-/******************************************************************
- function: daemonize
- description: become a daemon process; i.e. detach from the
- control terminal, don't reacquire a control terminal,
- become process group leader of our own process group,
- and set up to catch child process termination signals.
- arguments:
- logfile file to direct stdout and stderr to, if non-NULL.
-
- ret. value: none.
- globals: refers to the address of sigchld_handler().
- calls: none.
- *****************************************************************/
-
int
-daemonize (logfile, termhook)
-const char *logfile;
-void (*termhook)(void);
+daemonize (const char *logfile, void (*termhook)(int))
+/* detach from control TTY, become process group leader, catch SIGCHLD */
{
int fd;
pid_t childpid;
/* if we are started by init (process 1) via /etc/inittab we needn't
bother to detach from our process group context */
- my_termhook = termhook;
-
if (getppid() == 1)
goto nottyDetach;
group leader */
if ((childpid = fork()) < 0) {
- perror("fork");
+ error(0, errno, "fork");
return(PS_IOERR);
}
else if (childpid > 0)
#if defined(HAVE_SETSID) /* POSIX */
/* POSIX makes this soooo easy to do */
if (setsid() < 0) {
- perror("setsid");
+ error(0, errno, "setsid");
return(PS_IOERR);
}
#elif defined(SIGTSTP) /* BSD */
/* change process group */
+#ifndef __EMX__
setpgrp(0, getpid());
-
+#endif
/* lose controlling tty */
if ((fd = open("/dev/tty", O_RDWR)) >= 0) {
ioctl(fd, TIOCNOTTY, (char *) 0);
}
#else /* SVR3 and older */
/* change process group */
+#ifndef __EMX__
setpgrp();
+#endif
/* lose controlling tty */
signal(SIGHUP, SIG_IGN);
- if ((childpid = fork) < 0) {
- perror("fork");
+ if ((childpid = fork()) < 0) {
+ error(0, errno, "fork");
return(PS_IOERR);
}
else if (childpid > 0) {
/* Reopen stdin descriptor on /dev/null */
if ((fd = open("/dev/null", O_RDWR)) < 0) { /* stdin */
- perror("open: /dev/null");
+ error(0, errno, "open: /dev/null");
return(PS_IOERR);
}
if (logfile)
- open(logfile, O_CREAT|O_WRONLY, 0777); /* stdout */
+ fd = open(logfile, O_CREAT|O_WRONLY|O_APPEND, 0666); /* stdout */
else
if (dup(fd) < 0) { /* stdout */
- perror("dup");
+ error(0, errno, "dup");
return(PS_IOERR);
}
if (dup(fd) < 0) { /* stderr */
- perror("dup");
+ error(0, errno, "dup");
return(PS_IOERR);
}
#endif
/* set up to catch child process termination signals */
- signal(SIGCLD, sigchld_handler);
+ signal(SIGCHLD, sigchld_handler);
+#if defined(SIGPWR)
+ signal(SIGPWR, sigchld_handler);
+#endif
+ return(0);
}
+
+/* daemon.c ends here */
projects / ~andy / fetchmail / blobdiff