getsid man page on Tru64

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getsid(2)							     getsid(2)

NAME
       getsid - Retrieves the session ID of a process

SYNOPSIS
       #include <unistd.h>

       pid_t getsid(
	       pid_t process_id );

       Application  developers	may  want to specify an #include statement for
       <sys/types.h> before the one  for  <unistd.h>  if  programs  are	 being
       developed  for multiple platforms. The additional #include statement is
       not required on Tru64 UNIX systems or by ISO or X/Open  standards,  but
       may  be	required on other vendors' systems that conform to these stan‐
       dards.

STANDARDS
       Interfaces documented on this reference page conform to industry	 stan‐
       dards as follows:

       getsid():  XPG4-UNIX

       Refer  to  the  standards(5)  reference page for more information about
       industry standards and associated tags.

PARAMETERS
       Specifies the process ID that identifies the process for which you want
       to retrieve a session ID.

DESCRIPTION
       Use  the	 getsid function to retrieve the session ID for a process. The
       function returns the session ID assigned to the process	identified  in
       the  process_id	parameter.   If you specify 0 (zero) in the process_id
       parameter, the getsid function returns the session ID  of  the  calling
       process.

RETURN VALUES
       Upon  successful	 completion, the getsid() function returns the session
       ID of the process identified by the  process_id	parameter.  Otherwise,
       the function returns -1 and sets errno to indicate the error.

ERRORS
       The  getsid()  function sets errno to the specified values for the fol‐
       lowing conditions: The process_id parameter identifies a	 process  that
       is  in a different session from the calling process.  A process can use
       the getsid() function to get information only about  processes  in  its
       own  session.   The  system cannot locate the process identified by the
       process_ID parameter.

SEE ALSO
       Functions:  exec(2), fork(2), getpid(2), setpgid(2), setsid(2)

       Standards:  standards(5)

								     getsid(2)
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