Merge branch 'utimensat' into 'master'

Implement utimensat

See merge request redox-os/relibc!1263

src/header/sys_stat/mod.rs

@@ -6,7 +6,7 @@ use crate::{
     c_str::CStr,
     error::ResultExt,
     header::{
-        fcntl::{O_NOFOLLOW, O_PATH},
+        fcntl::{AT_SYMLINK_NOFOLLOW, O_NOFOLLOW, O_PATH},
         time::timespec,
     },
     out::Out,
@@ -240,3 +240,22 @@ pub unsafe extern "C" fn stat(file: *const c_char, buf: *mut stat) -> c_int {
 pub extern "C" fn umask(mask: mode_t) -> mode_t {
     Sys::umask(mask)
 }
+
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/utimensat.html>.
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn utimensat(
+    fd: c_int,
+    path: *const c_char,
+    times: *const timespec,
+    flag: c_int,
+) -> c_int {
+    let path = unsafe { CStr::from_ptr(path) };
+    match Sys::openat(fd, path, flag & AT_SYMLINK_NOFOLLOW, 0) {
+        Ok(fd) => unsafe {
+            let r = Sys::futimens(fd, times).map(|()| 0).or_minus_one_errno();
+            let _ = Sys::close(fd);
+            r
+        },
+        r => r.or_minus_one_errno(),
+    }
+}

tests/Makefile.tests.mk

@@ -147,6 +147,7 @@ EXPECT_NAMES=\
 	sys_stat/lstat \
 	sys_stat/fstatat \
 	sys_stat/umask \
+	sys_stat/utimensat \
 	sys_syslog/syslog \
 	time/asctime \
 	time/constants \

tests/sys_stat/utimensat.c

@@ -0,0 +1,36 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+#include "test_helpers.h"
+
+int main() {
+    const char *test_file = "utimensat.txt";
+    struct stat st;
+    struct timespec times[2];
+
+    int fd = open(test_file, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+    ERROR_IF(open, fd, == -1);
+    close(fd);
+
+    times[0].tv_sec = 100;
+    times[0].tv_nsec = 0;
+    times[1].tv_sec = 200;
+    times[1].tv_nsec = 0;
+
+    int utime_status = utimensat(AT_FDCWD, test_file, times, 0);
+    ERROR_IF(utimensat, utime_status, == -1);
+
+    int stat_status = stat(test_file, &st);
+    ERROR_IF(stat, stat_status, == -1);
+
+    UNEXP_IF(utimensat_atime, st.st_atime, != times[0].tv_sec);
+    UNEXP_IF(utimensat_mtime, st.st_mtime, != times[1].tv_sec);
+
+    int unlink_status = unlink(test_file);
+    ERROR_IF(unlink, unlink_status, == -1);
+
+    return 0;
+}