SETPGID(2)                OpenBSD Programmer's Manual               SETPGID(2)

NAME
     setpgid, setpgrp - set process group



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 pro-
     cess.

     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 in-
     voking process.

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 pgrp argument is less than zero.

     [EPERM]       The effective user ID of the requested process is different
                   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 conforms to IEEE Std1003.1-1988 (``POSIX'').

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

OpenBSD 2.6                      June 4, 1993                                1