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

NAME
     setpgid, setpgrp -- set process group

SYNOPSIS
     #include <&lt;unistd.h>&gt;

     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, the process ID of the specified process is
     used.

RETURN VALUES
     Upon successful completion, the value 0 is returned; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

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 requested process is a descendant of the calling
                        process, and is either a session leader or not in the
                        same session as the calling process.

     [EPERM]            The value of the pgrp argument is neither the PID of
                        the process indicated by the pid argument nor the
                        process group ID of an existing process group 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 descendant
                        of the calling process.

SEE ALSO
     getpgrp(2), setsid(2)

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

     The setpgid() function conforms to IEEE Std 1003.1-2008 (``POSIX.1'').

BSD                             March 27, 2017                             BSD