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

NAME
     setpgid, setpgrp — set process group

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     setpgid(pid_t pid, pid_t pgrp);

     int
     setpgrp(pid_t pid, pid_t pgrp);

DESCRIPTION
     Setpgid() 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 pgrp is zero, then the process id of the process specified
     by pid is used instead.

     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.

RETURN VALUES
     The setpgid() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

COMPATIBILITY
     Setpgrp() is identical to setpgid(), and is retained for calling conven‐
     tion compatibility with historical versions of BSD.

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(3) functions.

     [EINVAL]		The value of the pgrp is not legal (less than zero).

     [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.

     [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.

SEE ALSO
     getpgrp(2)

STANDARDS
     The setpgid() function call is expected to conform to ISO/IEC 9945-1:1990
     (“POSIX.1”).

BSD				 June 4, 1993				   BSD

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