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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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13
libc/calls/ftruncate-nt.c
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@ -16,9 +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/syscall_support-nt.internal.h"
#include "libc/nt/enum/filemovemethod.h"
#include "libc/nt/errors.h"
#include "libc/nt/files.h"
#include "libc/nt/runtime.h"
#include "libc/sysv/errfuns.h"
textwindows int sys_ftruncate_nt(int64_t handle, uint64_t length) {
@ -28,7 +31,13 @@ textwindows int sys_ftruncate_nt(int64_t handle, uint64_t length) {
if ((ok = SetFilePointerEx(handle, 0, &tell, kNtFileCurrent))) {
ok = SetFilePointerEx(handle, length, NULL, kNtFileBegin) &&
SetEndOfFile(handle);
SetFilePointerEx(handle, tell, NULL, kNtFileBegin);
_npassert(SetFilePointerEx(handle, tell, NULL, kNtFileBegin));
}
if (ok) {
return 0;
} else if (GetLastError() == kNtErrorAccessDenied) {
return einval(); // ftruncate() doesn't raise EACCES
} else {
return __winerr();
}
return ok ? 0 : __winerr();
}