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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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27
libc/calls/getuid.c
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@ -16,10 +16,12 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/dce.h"
#include "libc/intrin/strace.internal.h"
#include "libc/limits.h"
#include "libc/macros.internal.h"
#include "libc/nt/accounting.h"
#include "libc/runtime/runtime.h"
@ -38,7 +40,7 @@ static textwindows dontinline uint32_t GetUserNameHash(void) {
char16_t buf[257];
uint32_t size = ARRAYLEN(buf);
GetUserName(&buf, &size);
return KnuthMultiplicativeHash32(buf, size >> 1);
return KnuthMultiplicativeHash32(buf, size >> 1) & INT_MAX;
}
/**
@ -47,18 +49,22 @@ static textwindows dontinline uint32_t GetUserNameHash(void) {
* This never fails. On Windows, which doesn't really have this concept,
* we return a deterministic value that's likely to work.
*
* @return user id (always successful)
* @asyncsignalsafe
* @threadsafe
* @vforksafe
*/
uint32_t getuid(void) {
uint32_t rc;
if (!IsWindows()) {
int rc;
if (IsMetal()) {
rc = 0;
} else if (!IsWindows()) {
rc = sys_getuid();
} else {
rc = GetUserNameHash();
}
STRACE("%s() → %u% m", "getuid", rc);
_npassert(rc >= 0);
STRACE("%s() → %d", "getuid", rc);
return rc;
}
@ -68,16 +74,21 @@ uint32_t getuid(void) {
* This never fails. On Windows, which doesn't really have this concept,
* we return a deterministic value that's likely to work.
*
* @return group id (always successful)
* @asyncsignalsafe
* @threadsafe
* @vforksafe
*/
uint32_t getgid(void) {
uint32_t rc;
if (!IsWindows()) {
int rc;
if (IsMetal()) {
rc = 0;
} else if (!IsWindows()) {
rc = sys_getgid();
} else {
rc = GetUserNameHash();
}
STRACE("%s() → %u% m", "getgid", rc);
_npassert(rc >= 0);
STRACE("%s() → %d", "getgid", rc);
return rc;
}