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Introduce clock_nanosleep()

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Justine Tunney 2022-10-05 06:37:15 -07:00
parent fe3216e961
commit b75a4654cf
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GPG key ID: BE714B4575D6E328
33 changed files with 553 additions and 100 deletions
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14
libc/calls/nanosleep.c
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@ -23,25 +23,23 @@
#include "libc/dce.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/sysv/consts/clock.h"
#include "libc/sysv/errfuns.h"
/**
* Sleeps for a particular amount of time.
* Sleeps for relative amount of time.
*
* @param req is the duration of time we should sleep
* @param rem if non-NULL will receive the amount of time that wasn't
* slept because a signal was delivered. If no signal's delivered
* then this value will be set to `{0, 0}`. It's also fine to set
* this value to the same pointer as `req`.
* this value to the same pointer as `req`
* @return 0 on success, or -1 w/ errno
* @raise EINVAL if `req->tv_nsec ∉ [0,1000000000)`
* @raise EINTR if a signal was delivered, and `rem` is updated
* @raise EFAULT if `req` is NULL or `req` / `rem` is a bad pointer
* @raise ENOSYS on bare metal
* @note POSIX.1 specifies nanosleep() measures against `CLOCK_REALTIME`
* however Linux measures uses `CLOCK_MONOTONIC`. This shouldn't
* matter, since POSIX.1 further specifies that discontinuous
* changes in `CLOCK_REALTIME` shouldn't impact nanosleep()
* @see clock_nanosleep()
* @norestart
*/
int nanosleep(const struct timespec *req, struct timespec *rem) {
@ -53,7 +51,9 @@ int nanosleep(const struct timespec *req, struct timespec *rem) {
} else if (req->tv_sec < 0 ||
!(0 <= req->tv_nsec && req->tv_nsec <= 999999999)) {
rc = einval();
} else if (!IsWindows() && !IsMetal() && !IsXnu()) {
} else if (IsLinux()) {
rc = sys_clock_nanosleep(CLOCK_REALTIME, 0, req, rem);
} else if (IsOpenbsd() || IsFreebsd() || IsNetbsd()) {
rc = sys_nanosleep(req, rem);
} else if (IsXnu()) {
rc = sys_nanosleep_xnu(req, rem);