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SETPGID(2)		    BSD System Calls Manual		    SETPGID(2)

NAME
     setpgid, setpgrp — set process group

SYNOPSIS
     #include <unistd.h>

     int
     setpgid(pid_t pid, pid_t pgid);

     pid_t
     setpgrp(void);

DESCRIPTION
     Setpgid() sets the process group of the specified process pid to the
     specified pgid.  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 effective user-id as the invoker or be a descendant of the
     invoking process.

     If the calling process is not already a session leader, setpgrp() sets
     the process group ID of the calling process to that of the calling
     process.  Any new session that this creates will have no controlling ter‐
     minal.

RETURN VALUES
     Setpgid() returns 0 when the operation was successful.  If the request
     failed, -1 is returned and the global variable errno indicates the rea‐
     son.

ERRORS
     Setpgid() will fail and the process group will not be altered if:

     [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 one of the
			exec functions.

     [EINVAL]		The value of the pgid argument is less than 0 or is
			not a value supported by the implementation.

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

     [EPERM]		The effective user ID of the requested process is dif‐
			ferent from that of the caller and the process is not
			a descendant of the calling process.

     [EPERM]		The value of the pgid argument is valid, but 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 pgid 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 or of a child
			process of the calling process.

LEGACY SYNOPSIS
     #include <unistd.h>

     int
     setpgrp(pid_t pid, pid_t pgid);

     The legacy setpgrp() function is a clone of the setpgid() function,
     retained for calling convention compatibility with historical versions of
     BSD.

COMPATIBILITY
     Use of the legacy version of the setpgrp() call will cause compiler diag‐
     nostics.  Use setpgid() instead.

     Use of private (and conflicting) prototypes for setpgrp() will cause com‐
     piler diagnostics.	 Delete the private prototypes and include <unistd.h>.

SEE ALSO
     getpgrp(2), compat(5)

STANDARDS
     The setpgid() function conforms to IEEE Std 1003.1-1988 (“POSIX.1”).

4th Berkeley Distribution	 June 4, 1993	     4th Berkeley Distribution

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