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OpenSolaris 2009.06 - man page for setsid (opensolaris section 2)

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setsid(2)				   System Calls 				setsid(2)

       setsid - create session and set process group ID

       #include <sys/types.h>
       #include <unistd.h>

       pid_t setsid(void);

       The setsid() function creates a new session, if the calling process is not a process group
       leader. Upon return the calling process will be the session leader of  this  new  session,
       will be the process group leader of a new process group, and will have no controlling ter-
       minal. The process group  ID of the calling process will be set equal to the process ID of
       the calling process. The calling process will be the only process in the new process group
       and the only process in the new session.

       Upon successful completion, setsid() returns the value of the process  group   ID  of  the
       calling process. Otherwise it returns (pid_t)-1 and sets errno to indicate the error.

       The setsid() function will fail if:

       EPERM	The  calling  process is already a process group leader, or the process group  ID
		of a process other than the calling process matches the process  ID of the  call-
		ing process.

       See attributes(5) for descriptions of the following attributes:

       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       |Interface Stability	     |Standard			   |
       |MT-Level		     |Async-Signal-Safe 	   |

       getsid(2), setpgid(2), setpgrp(2), attributes(5), standards(5)

       A  call	to  setsid() by a process that is a process group leader will fail. A process can
       become a process group leader by being the last member of a pipeline started by a job con-
       trol  shell.  Thus,  a  process that expects to be part of a pipeline, and that calls set-
       sid(), should always first fork; the parent should exit and the	child  should  call  set-
       sid().  This  will ensure that the calling process will work reliably when started by both
       job control shells and non-job control shells.

SunOS 5.11				   21 Aug 2002					setsid(2)
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