hush/libbb/signals.c

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/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
* Copyright (C) 2006 Rob Landley
* Copyright (C) 2006 Denys Vlasenko
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
#include "libbb.h"
/* All known arches use small ints for signals */
smallint bb_got_signal;
int FAST_FUNC sigprocmask_allsigs(int how)
{
sigset_t set;
sigfillset(&set);
return sigprocmask(how, &set, NULL);
}
void FAST_FUNC bb_signals(long int sigs, sig_t f)
{
int sig_no = 0;
long int bit = 1;
while (sigs) {
if (sigs & bit) {
sigs -= bit;
signal(sig_no, f);
}
sig_no++;
bit <<= 1;
}
}
void FAST_FUNC sig_unblock(int sig)
{
sigset_t ss;
sigemptyset(&ss);
sigaddset(&ss, sig);
sigprocmask(SIG_UNBLOCK, &ss, NULL);
}
/* Assuming the sig is fatal */
void FAST_FUNC kill_myself_with_sig(int sig)
{
signal(sig, SIG_DFL);
sig_unblock(sig);
signal_parent_to_resume();
raise(sig);
_exit(sig | 128); /* Should not reach it */
}
#ifdef __GNO__
/* Include our own version of sigprocmask, because the one in
* GNO 2.0.6 libc is broken for SIG_SETMASK and SIG_UNBLOCK cases
* (it will never unblock any signals). */
int sigprocmask(int how, const sigset_t *set, sigset_t *oset)
{
sigset_t oldmask;
if (set) {
switch (how) {
case SIG_BLOCK:
oldmask = sigblock(*set);
break;
case SIG_SETMASK:
oldmask = sigsetmask(*set);
break;
case SIG_UNBLOCK:
oldmask = sigblock(0);
sigsetmask(oldmask & ~*set);
break;
default:
errno = EINVAL;
return -1;
}
} else if (oset) {
oldmask = sigblock(0);
}
if (oset)
*oset = oldmask;
return 0;
}
#endif