mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
6f7d0cb1c3
This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available.
105 lines
5.1 KiB
C
105 lines
5.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ 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 "libc/intrin/strace.internal.h"
|
|
#include "libc/calls/struct/itimerval.h"
|
|
#include "libc/calls/struct/itimerval.internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/intrin/asan.internal.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
#include "libc/time/time.h"
|
|
|
|
/**
|
|
* Schedules delivery of one-shot or intermittent interrupt signal, e.g.
|
|
*
|
|
* Raise SIGALRM every 1.5s:
|
|
*
|
|
* CHECK_NE(-1, sigaction(SIGALRM,
|
|
* &(struct sigaction){.sa_sigaction = _missingno},
|
|
* NULL));
|
|
* CHECK_NE(-1, setitimer(ITIMER_REAL,
|
|
* &(const struct itimerval){{1, 500000},
|
|
* {1, 500000}},
|
|
* NULL));
|
|
*
|
|
* Set single-shot 50ms timer callback to interrupt laggy connect():
|
|
*
|
|
* CHECK_NE(-1, sigaction(SIGALRM,
|
|
* &(struct sigaction){.sa_sigaction = _missingno,
|
|
* .sa_flags = SA_RESETHAND},
|
|
* NULL));
|
|
* CHECK_NE(-1, setitimer(ITIMER_REAL,
|
|
* &(const struct itimerval){{0, 0}, {0, 50000}},
|
|
* NULL));
|
|
* if (connect(...) == -1 && errno == EINTR) { ... }
|
|
*
|
|
* Disarm timer:
|
|
*
|
|
* CHECK_NE(-1, setitimer(ITIMER_REAL, &(const struct itimerval){0}, NULL));
|
|
*
|
|
* Be sure to check for EINTR on your i/o calls, for best low latency.
|
|
*
|
|
* Timers are not inherited across fork.
|
|
*
|
|
* @param which can be ITIMER_REAL, ITIMER_VIRTUAL, etc.
|
|
* @param newvalue specifies the interval ({0,0} means one-shot) and
|
|
* duration ({0,0} means disarm) in microseconds ∈ [0,999999] and
|
|
* if this parameter is NULL, we'll polyfill getitimer() behavior
|
|
* @param out_opt_old may receive remainder of previous op (if any)
|
|
* @return 0 on success or -1 w/ errno
|
|
*/
|
|
int setitimer(int which, const struct itimerval *newvalue,
|
|
struct itimerval *oldvalue) {
|
|
int rc;
|
|
|
|
if (IsAsan() &&
|
|
((newvalue && !__asan_is_valid(newvalue, sizeof(*newvalue))) ||
|
|
(oldvalue && !__asan_is_valid(oldvalue, sizeof(*oldvalue))))) {
|
|
rc = efault();
|
|
} else if (!IsWindows()) {
|
|
if (newvalue) {
|
|
rc = sys_setitimer(which, newvalue, oldvalue);
|
|
} else {
|
|
rc = sys_getitimer(which, oldvalue);
|
|
}
|
|
} else {
|
|
rc = sys_setitimer_nt(which, newvalue, oldvalue);
|
|
}
|
|
|
|
if (newvalue && oldvalue) {
|
|
STRACE("setitimer(%d, "
|
|
"{{%'ld, %'ld}, {%'ld, %'ld}}, "
|
|
"[{{%'ld, %'ld}, {%'ld, %'ld}}]) → %d% m",
|
|
which, newvalue->it_interval.tv_sec, newvalue->it_interval.tv_usec,
|
|
newvalue->it_value.tv_sec, newvalue->it_value.tv_usec,
|
|
oldvalue->it_interval.tv_sec, oldvalue->it_interval.tv_usec,
|
|
oldvalue->it_value.tv_sec, oldvalue->it_value.tv_usec, rc);
|
|
} else if (newvalue) {
|
|
STRACE("setitimer(%d, {{%'ld, %'ld}, {%'ld, %'ld}}, NULL) → %d% m", which,
|
|
newvalue->it_interval.tv_sec, newvalue->it_interval.tv_usec,
|
|
newvalue->it_value.tv_sec, newvalue->it_value.tv_usec, rc);
|
|
} else if (oldvalue) {
|
|
STRACE("setitimer(%d, NULL, [{{%'ld, %'ld}, {%'ld, %'ld}}]) → %d% m", which,
|
|
oldvalue->it_interval.tv_sec, oldvalue->it_interval.tv_usec,
|
|
oldvalue->it_value.tv_sec, oldvalue->it_value.tv_usec, rc);
|
|
} else {
|
|
STRACE("setitimer(%d, NULL, NULL) → %d% m", which, rc);
|
|
}
|
|
|
|
return rc;
|
|
}
|