setsid man page on DragonFly

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SETSID(2)		    BSD System Calls Manual		     SETSID(2)

NAME
     setsid — create session and set process group ID

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     pid_t
     setsid(void);

DESCRIPTION
     The setsid() function creates a new session.  The calling process is the
     session leader of the new session, is the process group leader of a new
     process group and has no controlling terminal.  The calling process is
     the only process in either the session or the process group.

RETURN VALUES
     Upon successful completion, the setsid() function returns the value of
     the process group ID of the new process group, which is the same as the
     process ID of the calling process.	 If an error occurs, setsid() returns
     -1 and the global variable errno is set to indicate the error.

ERRORS
     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 calling
			process.

SEE ALSO
     setpgid(2), tcgetpgrp(3), tcsetpgrp(3)

STANDARDS
     The setsid() function is expected to be compliant with the ISO/IEC
     9945-1:1990 (“POSIX.1”) specification.

BSD				 June 4, 1993				   BSD
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