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Improve system call support

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This commit is contained in:
Justine Tunney 2021-08-25 21:35:58 -07:00
parent 63b867bd2f
commit 3085ac7837
65 changed files with 900 additions and 544 deletions
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35
libc/calls/issymlink.c
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@ -16,8 +16,10 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/weaken.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/metastat.internal.h"
#include "libc/calls/struct/stat.h"
#include "libc/dce.h"
#include "libc/errno.h"
@ -25,19 +27,38 @@
#include "libc/nt/files.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/errfuns.h"
#include "libc/zipos/zipos.internal.h"
/**
* Returns true if file exists and is a symbolic link.
*
* This function is equivalent to:
*
* struct stat st;
* return fstatat(AT_FDCWD, path, &st, AT_SYMLINK_NOFOLLOW) != -1 &&
* S_ISLNK(st.st_mode);
*
* Except faster and with fewer dependencies.
*
* @see isregularfile(), isdirectory(), fileexists(), ischardev()
*/
bool issymlink(const char *path) {
struct stat st;
int rc, olderr;
int e;
union metastat st;
struct ZiposUri zipname;
if (IsAsan() && !__asan_is_valid(path, 1)) return efault();
if (!IsWindows()) {
olderr = errno;
rc = sys_fstatat(AT_FDCWD, path, &st, AT_SYMLINK_NOFOLLOW);
if (rc == -1 && (errno == ENOENT || errno == ENOTDIR)) errno = olderr;
return rc != -1 && S_ISLNK(st.st_mode);
if (weaken(__zipos_open) && weaken(__zipos_parseuri)(path, &zipname) != -1) {
return false;
} else if (IsMetal()) {
return false;
} else if (!IsWindows()) {
e = errno;
if (__sys_fstatat(AT_FDCWD, path, &st, AT_SYMLINK_NOFOLLOW) != -1) {
return S_ISLNK(METASTAT(st, st_mode));
} else {
errno = e;
return false;
}
} else {
return issymlink_nt(path);
}