killpg.2

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· 2 代码 · 共 51 行

.\" SCCSID: @(#)killpg.2	6.2	6/15/89
.TH killpg 2
.SH Name
killpg \- send signal to process or process group
.SH Syntax
killpg(\fIpgrp, sig\fP)
.br
int \fIpgrp, sig\fP;
.SH Description
.NXR "killpg system call"
.NXR "process group" "signaling"
The
.PN killpg
system call sends the signal
.I sig
to the process group
.IR pgrp .
See 
.MS sigvec 2
for a list of signals.
.PP
The sending process and members of the process group must
have the same effective user ID, otherwise
this call is restricted to the superuser with the exception
of the signal SIGCONT.  The signal SIGCONT can be sent to
any process which is a descendant of the current process.
.SH Return Values
Upon successful completion, a value of 0 is returned.  Otherwise,
a value of \-1 is returned, and the global variable 
.I errno
is set to indicate the error.
.SH Diagnostics
The
.PN killpg
system call fails and a signal is not sent under the following
conditions:
.TP 15
[EINVAL]
The \fIsig\fP is not a valid signal number.
.TP 15
[EPERM]
The sending process is not the superuser and all
of the target processes have an effective user ID that differs
from that of the sending process.
.TP 15
[ESRCH]
No process can be found corresponding to that specified by
.I pgrp.
.SH See Also
getpgrp(2), kill(2), sigvec(2)