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Improve docs of more system calls

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This change also found a few POSIX compliance bugs with errnos. Another
bug was discovered where, on Windows, pread() and pwrite() could modify
the file position in cases where ReadFile() returned an error e.g. when
seeking past the end of file. We also have more tests!
This commit is contained in:
Justine Tunney 2022-10-02 22:14:33 -07:00
parent af24c19db3
commit ccbae7799e
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GPG key ID: BE714B4575D6E328
39 changed files with 589 additions and 175 deletions
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24
libc/calls/clock_gettime.c
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@ -20,7 +20,6 @@
#include "libc/calls/asan.internal.h"
#include "libc/calls/clock_gettime.internal.h"
#include "libc/calls/state.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/calls/struct/timespec.internal.h"
#include "libc/calls/struct/timeval.h"
#include "libc/calls/syscall_support-sysv.internal.h"
@ -30,6 +29,7 @@
#include "libc/intrin/asmflag.h"
#include "libc/intrin/bits.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/mem/alloca.h"
#include "libc/nt/synchronization.h"
#include "libc/sysv/errfuns.h"
@ -48,12 +48,30 @@
* __clock_gettime l: 35𝑐 11𝑛𝑠
* sys_clock_gettime l: 220𝑐 71𝑛𝑠
*
* @param clock can be CLOCK_REALTIME, CLOCK_MONOTONIC, etc.
* @param clock can be one of:
* - `CLOCK_REALTIME`: universally supported
* - `CLOCK_REALTIME_FAST`: ditto but faster on freebsd
* - `CLOCK_MONOTONIC`: universally supported
* - `CLOCK_MONOTONIC_FAST`: ditto but faster on freebsd
* - `CLOCK_MONOTONIC_RAW`: nearly universally supported
* - `CLOCK_PROCESS_CPUTIME_ID`: linux and bsd
* - `CLOCK_THREAD_CPUTIME_ID`: linux and bsd
* - `CLOCK_REALTIME_COARSE`: : linux and openbsd
* - `CLOCK_MONOTONIC_COARSE`: linux
* - `CLOCK_PROF`: linux and netbsd
* - `CLOCK_BOOTTIME`: linux and openbsd
* - `CLOCK_REALTIME_ALARM`: linux-only
* - `CLOCK_BOOTTIME_ALARM`: linux-only
* - `CLOCK_TAI`: linux-only
* @param ts is where the result is stored
* @return 0 on success, or -1 w/ errno
* @error EINVAL if clock isn't supported on this system
* @error EPERM if pledge() is in play without stdio promise
* @error EINVAL if `clock` isn't supported on this system
* @error EFAULT if `ts` points to bad memory
* @see strftime(), gettimeofday()
* @asyncsignalsafe
* @threadsafe
* @vforksafe
*/
int clock_gettime(int clock, struct timespec *ts) {
int rc;