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KILLPG(2)                   BSD System Calls Manual                  KILLPG(2)

NAME
     killpg -- send signal to a process group

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <signal.h>

     int
     killpg(pid_t pgrp, int sig);

DESCRIPTION
     The killpg() function sends the signal sig to the process group pgrp.  See sigaction(2) for a list of
     signals.  If pgrp is 0, killpg() sends the signal to the sending process's process group.

     The sending process and members of the process group must have the same effective user ID, or the
     sender must be the super-user.  As a single special case the continue signal SIGCONT may be sent to any
     process that is a descendant of the current process.

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

ERRORS
     The killpg() function will fail and no signal will be sent if:

     [EINVAL]           The sig argument is not a valid signal number.

     [EPERM]            The sending process is not the super-user and one or more of the target processes
                        has an effective user ID different from that of the sending process.

     [ESRCH]            No process can be found in the process group specified by pgrp.

     [ESRCH]            The process group was given as 0 but the sending process does not have a process
                        group.

LEGACY SYNOPSIS
     #include <sys/types.h>
     #include <signal.h>

     The include file <sys/types.h> is necessary.

SEE ALSO
     getpgrp(2), kill(2), sigaction(2), compat(5)

HISTORY
     The killpg() function appeared in 4.0BSD.

BSD                              June 2, 1993                              BSD