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28 .\" @(#)setsid.2 8.1 (Berkeley) 6/4/93
29 .\" $FreeBSD: src/lib/libc/sys/setsid.2,v 1.10.2.2 2001/12/14 18:34:01 ru Exp $
30 .\" $DragonFly: src/lib/libc/sys/setsid.2,v 1.2 2003/06/17 04:26:47 dillon Exp $
37 .Nd create session and set process group ID
47 function creates a new session.
48 The calling process is the session leader of the new session, is the
49 process group leader of a new process group and has no controlling
51 The calling process is the only process in either the session or the
54 Upon successful completion, the
56 function returns the value of the process group ID of the new process
57 group, which is the same as the process ID of the calling process.
60 returns -1 and the global variable
62 is set to indicate the error.
66 function will fail if:
69 The calling process is already a process group leader, or the process
70 group ID of a process other than the calling process matches the process
71 ID of the calling process.
80 function is expected to be compliant with the