Differences between current version and predecessor to the previous major change of setsid(2).
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| Newer page: | version 4 | Last edited on Friday, May 9, 2003 9:11:25 pm | by JohnMcPherson | |
| Older page: | version 1 | Last edited on Tuesday, June 4, 2002 12:23:46 am | by perry | Revert |
@@ -1,61 +1,24 @@
-SETSID
-!!!SETSID
-NAME
-SYNOPSIS
-DESCRIPTION
-RETURN VALUE
-ERRORS
-NOTES
-CONFORMING TO
-SEE ALSO
-----
!!NAME
+setsid - creates a session and sets the process group ID
-
-setsid - creates a session and sets the process group ID
!!SYNOPSIS
+ __#include <unistd.h>__
-
-__#include __
-
-
-
+
__pid_t setsid(void);__
!!DESCRIPTION
+setsid(2) creates a new session if the calling process is not a process group leader. The calling process is the leader of the new session, the process group leader of the new process group, and has no controlling tty. The process group ID and session ID of the calling process are set to the PID of the calling process. The calling process will be the only process in this new process group and in this new session.
-
-__setsid()__ creates a new session if the calling process
-is not a process group leader. The calling process is the
-leader of the new session, the process group leader of the
-new process group, and has no controlling tty. The process
-group ID and session ID of the calling process are set to
-the PID of the calling process. The calling process will be
-the only process in this new process group and in this new
-session.
!!RETURN VALUE
+The session ID of the calling process.
-
-The session ID of the calling process.
!!ERRORS
+On error, -1 will be returned. The only error which can happen is [EPERM]. It is returned when the process group ID of any process equals the PID of the calling process. Thus, in particular, setsid(2) fails if the calling process is already a process group leader.
-
-On error, -1 will be returned. The only error which can
-happen is EPERM. It is returned when the process group ID of
-any process equals the PID of the calling process. Thus, in
-particular, __setsid__ fails if the calling process is
-already a process group leader.
!!NOTES
+A process group leader is a process with process group ID equal to its PID. In order to be sure that setsid(2) will succeed, fork and exit, and have the child do setsid(2).
-
-A process group leader is a process with process group ID
-equal to its PID. In order to be sure that __setsid__
-will succeed, fork and exit, and have the child do
-__setsid().__
!!CONFORMING TO
+[POSIX], SVr4.
-
-POSIX, SVr4.
!!SEE ALSO
-
-
-
-----
+setpgid(2), setpgrp(2), setsid(8)
