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Linux: Add cachestat, fchmodat2 syscalls (#958)

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Stephen Gregoratto 2023-11-20 14:01:20 +11:00 • committed by GitHub
parent 69faf1b403
commit cc5c5319bf
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8 changed files with 287 additions and 1 deletions
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12
libc/calls/fchmodat.c
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@ -20,6 +20,7 @@
#include "libc/calls/syscall-nt.internal.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/asan.internal.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/strace.internal.h"
@ -28,6 +29,7 @@
#include "libc/sysv/errfuns.h"
int sys_fchmodat_linux(int, const char *, unsigned, int);
int sys_fchmodat2(int, const char *, unsigned, int);
/**
* Changes permissions on file, e.g.:
@ -40,6 +42,9 @@ int sys_fchmodat_linux(int, const char *, unsigned, int);
* @param mode contains octal flags (base 8)
* @param flags can have `AT_SYMLINK_NOFOLLOW`
* @raise EROFS if `dirfd` or `path` use zip file system
* @raise EOPNOTSUP on Linux if `path` is a symbolic link, `AT_SYMLINK_NOFOLLOW`
* is set in `flags`, and filesystem does not support setting the mode of
* symbolic links.
* @errors ENOENT, ENOTDIR, ENOSYS
* @asyncsignalsafe
* @see fchmod()
@ -53,7 +58,12 @@ int fchmodat(int dirfd, const char *path, uint32_t mode, int flags) {
rc = erofs();
} else if (!IsWindows()) {
if (IsLinux() && flags) {
rc = sys_fchmodat_linux(dirfd, path, mode, flags);
int serrno = errno;
rc = sys_fchmodat2(dirfd, path, mode, flags);
if (rc == -1 && errno == ENOSYS) {
errno = serrno;
rc = sys_fchmodat_linux(dirfd, path, mode, flags);
}
} else {
rc = sys_fchmodat(dirfd, path, mode, flags);
}