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BSD 2.11 - man page for setpgrp (bsd section 2)

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SETPGRP(2)									       SETPGRP(2)

NAME
       setpgrp - set process group

SYNOPSIS
       setpgrp(pid, pgrp)
       int pid, pgrp;

DESCRIPTION
       Setpgrp sets the process group of the specified process pid to the specified pgrp.  If pid
       is zero, then the call applies to the current process.

       If the invoker is not the super-user, then the affected process must have the same  effec-
       tive user-id as the invoker or be a descendant of the invoking process.

RETURN VALUE
       Setpgrp	returns when the operation was successful.  If the request failed, -1 is returned
       and the global variable errno indicates the reason.

ERRORS
       Setpgrp will fail and the process group will not be altered if one of the following occur:

       [ESRCH]	      The requested process does not exist.

       [EPERM]	      The effective user ID of the requested process is different  from  that  of
		      the caller and the process is not a descendent of the calling process.

SEE ALSO
       getpgrp(2)

4th Berkeley Distribution		   May 9, 1985				       SETPGRP(2)
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