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Improve system calls

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- Wrap clock_getres()
- Wrap sched_setscheduler()
- Make sleep() api conformant
- Polyfill sleep() using select()
- Improve clock_gettime() polyfill
- Make nanosleep() POSIX conformant
- Slightly improve some DNS functions
- Further strengthen pledge() sandboxing
- Improve rounding of timeval / timespec
- Allow layering of pledge() calls on Linux
- Polyfill sched_yield() using select() on XNU
- Delete more system constants we probably don't need
This commit is contained in:
Justine Tunney 2022-07-08 06:29:24 -07:00
parent 5df3e4e7a8
commit 853b6c3864
330 changed files with 1971 additions and 1223 deletions
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86
libc/calls/nanosleep-nt.c
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@ -16,64 +16,84 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/internal.h"
#include "libc/calls/sig.internal.h"
#include "libc/calls/state.internal.h"
#include "libc/calls/strace.internal.h"
#include "libc/errno.h"
#include "libc/limits.h"
#include "libc/macros.internal.h"
#include "libc/nexgen32e/rdtsc.h"
#include "libc/nt/errors.h"
#include "libc/nt/nt/time.h"
#include "libc/nt/synchronization.h"
#include "libc/sysv/consts/clock.h"
#include "libc/sysv/errfuns.h"
#include "libc/time/clockstonanos.internal.h"
textwindows noinstrument int sys_nanosleep_nt(const struct timespec *req,
struct timespec *rem) {
int rc;
textwindows int sys_nanosleep_nt(const struct timespec *req,
struct timespec *rem) {
bool alertable;
uint32_t slice;
int64_t ms, sec, nsec;
uint64_t begin;
int64_t ms, toto, nanos;
struct timespec elapsed;
// check req is legal timespec
if (!(0 <= req->tv_nsec && req->tv_nsec < 1000000000)) {
return einval();
}
// save beginning timestamp
if (!__time_critical && rem) {
begin = rdtsc();
} else {
begin = 0; // to prevent uninitialized warning
}
// convert timespec to milliseconds
if (__builtin_mul_overflow(req->tv_sec, 1000, &ms) ||
__builtin_add_overflow(ms, req->tv_nsec / 1000000, &ms)) {
__builtin_add_overflow(ms, (req->tv_nsec + 999999) / 1000000, &ms)) {
ms = INT64_MAX;
}
if (!ms && (req->tv_sec || req->tv_nsec)) {
ms = 1;
}
rc = 0;
do {
for (toto = ms;;) {
// check if signal was delivered
if (!__time_critical && _check_interrupts(false, g_fds.p)) {
rc = eintr();
break;
if (rem) {
nanos = ClocksToNanos(rdtsc(), begin);
elapsed.tv_sec = nanos / 1000000000;
elapsed.tv_nsec = nanos % 1000000000;
*rem = _timespec_sub(*req, elapsed);
if (rem->tv_sec < 0) {
rem->tv_sec = 0;
rem->tv_nsec = 0;
}
}
return eintr();
}
// configure the sleep
slice = MIN(__SIG_POLLING_INTERVAL_MS, ms);
if (__time_critical) {
alertable = false;
} else {
alertable = true;
POLLTRACE("sys_nanosleep_nt polling for %'ldms of %'ld");
POLLTRACE("... sleeping %'ldms of %'ld", toto - ms, toto);
}
// perform the sleep
if (SleepEx(slice, alertable) == kNtWaitIoCompletion) {
POLLTRACE("IOCP EINTR");
POLLTRACE("IOCP EINTR"); // in case we ever figure it out
continue;
}
ms -= slice;
} while (ms > 0);
ms = MAX(ms, 0);
if (rem) {
sec = ms / 1000;
nsec = ms % 1000 * 1000000000;
rem->tv_nsec -= nsec;
if (rem->tv_nsec < 0) {
--rem->tv_sec;
rem->tv_nsec = 1000000000 - rem->tv_nsec;
}
rem->tv_sec -= sec;
if (rem->tv_sec < 0) {
rem->tv_sec = 0;
rem->tv_nsec = 0;
// check if full duration has elapsed
if ((ms -= slice) <= 0) {
if (rem) {
rem->tv_sec = 0;
rem->tv_nsec = 0;
}
return 0;
}
}
return rc;
}