The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

NAME

killpg - send a signal to a process group

SYNOPSIS

[XSI] [Option Start] #include <signal.h>

int killpg(pid_t
pgrp, int sig); [Option End]

DESCRIPTION

The killpg() function shall send the signal specified by sig to the process group specified by pgrp.

If pgrp is greater than 1, killpg(pgrpsig) shall be equivalent to kill(-pgrpsig). If pgrp is less than or equal to 1, the behavior of killpg() is undefined.

RETURN VALUE

Refer to kill().

ERRORS

Refer to kill().


The following sections are informative.

EXAMPLES

Sending a Signal to All Other Members of a Process Group

The following example shows how the calling process could send a signal to all other members of its process group. To prevent itself from receiving the signal it first makes itself immune to the signal by ignoring it.

#include <signal.h>
#include <unistd.h>
...
    if (signal(SIGUSR1, SIG_IGN) == SIG_ERR)
        /* Handle error */;

if (killpg(getpgrp(), SIGUSR1) == -1) /* Handle error */;"

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

getpgid(), getpid(), kill() , raise(), the Base Definitions volume of IEEE Std 1003.1-2001, <signal.h>

CHANGE HISTORY

First released in Issue 4, Version 2.

Issue 5

Moved from X/OPEN UNIX extension to BASE.

Issue 6

IEEE Std 1003.1-2001/Cor 2-2004, item XSH/TC2/D6/52 is applied, adding the example to the EXAMPLES section.

End of informative text.

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