diff options
Diffstat (limited to 'usr/src/lib/libast/common/comp/setsid.c')
| -rw-r--r-- | usr/src/lib/libast/common/comp/setsid.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/usr/src/lib/libast/common/comp/setsid.c b/usr/src/lib/libast/common/comp/setsid.c new file mode 100644 index 0000000000..3fffd606ec --- /dev/null +++ b/usr/src/lib/libast/common/comp/setsid.c @@ -0,0 +1,90 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1985-2007 AT&T Knowledge Ventures * +* and is licensed under the * +* Common Public License, Version 1.0 * +* by AT&T Knowledge Ventures * +* * +* A copy of the License is available at * +* http://www.opensource.org/licenses/cpl1.0.txt * +* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* Phong Vo <kpv@research.att.com> * +* * +***********************************************************************/ +#pragma prototyped + +#include <ast.h> + +#if _lib_setsid + +NoN(setsid) + +#else + +#include <ast_tty.h> +#include <error.h> + +/* + * become new process group leader and drop control tty + */ + +pid_t +setsid(void) +{ + int pg; +#ifdef TIOCNOTTY + int fd; +#endif + + /* + * become a new process group leader + */ + + if ((pg = getpid()) == getpgrp()) + { + errno = EPERM; + return(-1); + } + setpgid(pg, pg); +#ifdef TIOCNOTTY + + /* + * drop the control tty + */ + + if ((fd = open("/dev/tty", O_RDONLY)) >= 0) + { + ioctl(fd, TIOCNOTTY, 0); + close(fd); + } +#else + + /* + * second child in s5 to avoid reacquiring the control tty + */ + +#if _lib_fork && HUH920711 /* some s5's botch this */ + switch (fork()) + { + case -1: + exit(1); + case 0: + break; + default: + exit(0); + } +#endif + +#endif + return(pg); +} + +#endif |