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/*
* Signal compat.
*
* Copyright (c) 2009 Marko Kreen
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <usual/signal.h>
/*
* alarm() for win32
*/
#ifdef WIN32
struct AlarmCtx {
struct sigaction sa;
HANDLE event;
HANDLE thread;
int secs;
};
static volatile struct AlarmCtx actx;
static DWORD WINAPI w32_alarm_thread(LPVOID arg)
{
DWORD wres;
unsigned msecs;
loop:
if (actx.secs > 0) {
msecs = actx.secs * 1000;
} else {
msecs = INFINITE;
}
wres = WaitForSingleObject(actx.event, msecs);
if (wres == WAIT_OBJECT_0) {
goto loop;
} else if (wres == WAIT_TIMEOUT) {
actx.secs = 0;
if (actx.sa.sa_handler)
actx.sa.sa_handler(SIGALRM);
goto loop;
} else {
Sleep(1000);
goto loop;
}
return 0;
}
unsigned int alarm(unsigned int secs)
{
actx.secs = secs;
/* create event */
if (!actx.event) {
actx.event = CreateEvent(NULL, FALSE, FALSE, NULL);
if (!actx.event)
return 0;
}
/* create or notify thread */
if (!actx.thread) {
actx.thread = CreateThread(NULL, 0, w32_alarm_thread, NULL, 0, NULL);
} else {
SetEvent(actx.event);
}
return 0;
}
#endif
#ifndef HAVE_SIGACTION
int sigaction(int sig, const struct sigaction *sa, struct sigaction *old)
{
#ifdef WIN32
if (sig == SIGALRM) {
if (old)
*old = actx.sa;
if (sa)
actx.sa = *sa;
else
actx.sa.sa_handler = NULL;
return 0;
}
#endif
old->sa_handler = signal(sig, sa->sa_handler);
if (old->sa_handler == SIG_ERR)
return -1;
return 0;
}
#endif
#ifdef WIN32
/* Only sig=0 is supported, to detect if process is running (ESRCH->not) */
int kill(int pid, int sig)
{
HANDLE hProcess;
DWORD exitCode;
int ret = 0;
/* handle only sig == 0 */
if (sig != 0) {
errno = EINVAL;
return -1;
}
hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
if (hProcess == NULL) {
if (GetLastError() == ERROR_INVALID_PARAMETER)
ret = ESRCH;
else
ret = EPERM;
} else {
/* OpenProcess may succed for exited processes */
if (GetExitCodeProcess(hProcess, &exitCode)) {
if (exitCode != STILL_ACTIVE)
ret = ESRCH;
}
CloseHandle(hProcess);
}
if (ret) {
errno = ret;
return -1;
} else
return 0;
}
#endif
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