setsid(2) [hpux man page]

setsid(2)							System Calls Manual							 setsid(2)

NAME

       setsid - create session and set process group ID

SYNOPSIS

DESCRIPTION

       If  the	calling  process is not a process group leader, creates a new session.	The calling process becomes the session leader of this new
       session, it becomes the process group leader of a new process group, and it has no controlling terminal.  The process group ID of the call-
       ing  process  is  set equal to the process ID of the calling process.  The calling process is the only process in the new process group and
       the only process in the new session.

   Security Restrictions
       Some or all of the actions associated with this system call may require privileges.  See privileges(5) for more information.

RETURN VALUE

       Upon successful completion, returns the value of the new process group ID of the calling process.  Otherwise, it returns  a  value  of  and
       sets to indicate the error.

ERRORS

       If fails, no changes occur and (see errno(2)) is set to one of the following values:

	      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.

	      The calling process does not have sufficient privileges.

AUTHOR

       was developed by HP and AT&T.

SEE ALSO

       exec(2), exit(2), fork(2), getpid(2), kill(2), setpgid(2), setpgrp(2), setpgrp3(2), signal(2), privileges(5), termio(7).

STANDARDS CONFORMANCE

																	 setsid(2)

setpgid(3)						     Library Functions Manual							setpgid(3)

Name
       setpgid - set process group (POSIX)

Syntax
       #include <sys/types.h>
       int
       setpgid(pid, pgrp)
       pid_t pid, pgrp;

Description
       The  function is used to either join an existing process group or create a new process group within the session of the calling process (see
       Upon successful completion, the process group ID of the process that has a process ID which matches pid is set to pgrp.	If  pid  is  zero,
       then the call applies to the current process. In addition, if pgrp is zero, the process ID of the indicated process is used.

       This function is available only in the POSIX environment.

Return Values
       The  function  returns 0 when the operation is successful.  If the request fails, -1 is returned and the global variable indicates the rea-
       son.

Diagnostics
       The function fails and the process group is not altered if one of the following occurs:

       [EACCES]       The value of the pid argument matches the process ID of a child process of the calling process and  the  child  process  has
		      successfully executed an function.

       [EINVAL]       The value of the pgrp argument is less than zero or is not a supported value.

       [EPERM]	      The process indicated by the pid argument is a session leader.

		      The  value of the pid argument matches the process ID of a child process of the calling process and the child process is not
		      in the same session as the calling process.

		      The value of the pgrp argument does not match the process ID of the process indicated by the pid argument and  there  is	no
		      process with a process group ID that matches the value of the pgrp argument in the same session as the calling process.

       [ESRCH]	      The  value  of  the  pid	argument  does	not  match the process ID of the calling process of a child process of the calling
		      process.

See Also
       getpgrp(2), setsid(2)

																	setpgid(3)