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.
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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(pgrp, sig) shall be equivalent to kill(-pgrp, sig). 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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