diff options
| author | Kaleb Keithley <kaleb@freedesktop.org> | 2003-11-14 16:49:22 +0000 |
|---|---|---|
| committer | Kaleb Keithley <kaleb@freedesktop.org> | 2003-11-14 16:49:22 +0000 |
| commit | 58396f7f075f465fe9fb7580af16c96ad0a88738 (patch) | |
| tree | 6c78793d0af9e1cf786dceb03ccb130df18a9c95 /os/daemon.c | |
| parent | db757f1d2a5a951ec26aa4ed64134d8113089fd0 (diff) | |
Initial revisionXORG-STABLE
Diffstat (limited to 'os/daemon.c')
| -rw-r--r-- | os/daemon.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/os/daemon.c b/os/daemon.c new file mode 100644 index 0000000..0e5ce3e --- /dev/null +++ b/os/daemon.c @@ -0,0 +1,167 @@ +/* + +Copyright (c) 1988 X Consortium + +Permission is hereby granted, free of charge, to any person obtaining +a copy of this software and associated documentation files (the +"Software"), to deal in the Software without restriction, including +without limitation the rights to use, copy, modify, merge, publish, +distribute, sublicense, and/or sell copies of the Software, and to +permit persons to whom the Software is furnished to do so, subject to +the following conditions: + +The above copyright notice and this permission notice shall be included +in all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. +IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR +OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, +ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR +OTHER DEALINGS IN THE SOFTWARE. + +Except as contained in this notice, the name of the X Consortium shall +not be used in advertising or otherwise to promote the sale, use or +other dealings in this Software without prior written authorization +from the X Consortium. + +*/ +/* $XFree86: xc/programs/xfs/os/daemon.c,v 1.12 2002/10/20 21:42:50 tsi Exp $ */ + +#include <X11/Xos.h> +#include <sys/types.h> +#include <errno.h> +#include <stdlib.h> + +#ifndef __GLIBC__ +# if defined(__osf__) || \ + defined(__GNU__) || \ + defined(__CYGWIN__) || \ + defined(linux) +# define setpgrp setpgid +# endif +#endif + +#if defined(SVR4) || defined(USG) || defined(__GLIBC__) +# include <termios.h> +#else +# include <sys/ioctl.h> +#endif +#ifdef hpux +# include <sys/ptyio.h> +#endif + +#ifdef X_NOT_POSIX +# define Pid_t int +#else +# define Pid_t pid_t +#endif + +#include "os.h" + +void +BecomeOrphan () +{ + Pid_t child_id; + + chdir("/"); + /* + * fork so that the process goes into the background automatically. Also + * has a nice side effect of having the child process get inherited by + * init (pid 1). + * Separate the child into its own process group before the parent + * exits. This eliminates the possibility that the child might get + * killed when the init script that's running xfs exits. + */ + + child_id = fork(); + switch (child_id) { + case 0: + /* child */ + break; + case -1: + /* error */ + FatalError("daemon fork failed, %s\n", strerror(errno)); + break; + + default: + /* parent */ + +#if defined(CSRG_BASED) || \ + defined(SYSV) || \ + defined(SVR4) || \ + defined(__QNXNTO__) || \ + defined(__GLIBC__) || \ + defined(linux) + { + int stat; +# if defined(SVR4) || defined(__QNXNTO__) + /* This gets error EPERM. Why? */ + stat = setpgid (child_id, child_id); +# elif defined(SYSV) + stat = 0; /* don't know how to set child's process group */ +# elif defined(__GLIBC__) + stat = setpgrp (); +# else + stat = setpgrp (child_id, child_id); +# endif + if (stat != 0) + FatalError("setting process group for daemon failed: %s\n", + strerror(errno)); + } +#endif /* ! (CSRG_BASED || SYSV || SVR4 || __QNXNTO__ || __GLIBC__) */ + exit (0); + } +} + +void +BecomeDaemon () +{ + /* + * Close standard file descriptors and get rid of controlling tty. + */ + + /* If our C library has the daemon() function, just use it. */ +#if defined(__GLIBC__) || defined(CSRG_BASED) + daemon (0, 0); +#else + register int i; + +# if defined(SYSV) || defined(SVR4) || defined(__QNXNTO__) + setpgrp (); +# else + setpgrp (0, getpid()); +# endif + + close (0); + close (1); + close (2); + +# if !defined(__UNIXOS2__) && !defined(__CYGWIN__) +# if !((defined(SYSV) || defined(SVR4)) && defined(i386)) + if ((i = open ("/dev/tty", O_RDWR)) >= 0) { /* did open succeed? */ +# if defined(USG) && defined(TCCLRCTTY) + int zero = 0; + (void) ioctl (i, TCCLRCTTY, &zero); +# else +# if (defined(SYSV) || defined(SVR4)) && defined(TIOCTTY) + int zero = 0; + (void) ioctl (i, TIOCTTY, &zero); +# else + (void) ioctl (i, TIOCNOTTY, (char *) 0); /* detach, BSD style */ +# endif +# endif + (void) close (i); + } +# endif /* !((SYSV || SVR4) && i386) */ +# endif /* !__UNIXOS2__ && !__CYGWIN__ */ + + /* + * Set up the standard file descriptors. + */ + (void) open ("/", O_RDONLY); /* root inode already in core */ + (void) dup2 (0, 1); + (void) dup2 (0, 2); +#endif +} |