From 3646624e5e2e32eef744d6ba7c56ed3e06f7550b Mon Sep 17 00:00:00 2001
From: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Date: Tue, 7 Aug 2018 15:06:34 -0400
Subject: [PATCH] unix,fs: use utimes & friends for uv_fs_utime

This should improve uv_fs_utime resolution and reliability, as
utime(2)'s precision is left more to the implementing platform than the
newer but well supported alternatives.

Related to https://github.com/nodejs/node/issues/22070
PR-URL: https://github.com/libuv/libuv/pull/1940
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
---
 src/unix/fs.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 85 insertions(+), 2 deletions(-)

diff --git a/src/unix/fs.c b/src/unix/fs.c
index e66b1e4c839..011e2928bb9 100644
--- a/src/unix/fs.c
+++ b/src/unix/fs.c
@@ -43,7 +43,6 @@
 #include <pthread.h>
 #include <unistd.h>
 #include <fcntl.h>
-#include <utime.h>
 #include <poll.h>
 
 #if defined(__DragonFly__)        ||                                      \
@@ -67,6 +66,10 @@
 # define FICLONE _IOW(0x94, 9, int)
 #endif
 
+#if defined(_AIX) && !defined(_AIX71)
+# include <utime.h>
+#endif
+
 #define INIT(subtype)                                                         \
   do {                                                                        \
     if (req == NULL)                                                          \
@@ -702,10 +705,90 @@ static ssize_t uv__fs_sendfile(uv_fs_t* req) {
 
 
 static ssize_t uv__fs_utime(uv_fs_t* req) {
+#if defined(__linux__)
+  /* utimesat() has nanosecond resolution but we stick to microseconds
+   * for the sake of consistency with other platforms.
+   */
+  static int no_utimesat;
+  struct timespec ts[2];
+  struct timeval tv[2];
+  int r;
+
+  if (no_utimesat)
+    goto skip;
+
+  ts[0].tv_sec  = req->atime;
+  ts[0].tv_nsec = (uint64_t)(req->atime * 1000000) % 1000000 * 1000;
+  ts[1].tv_sec  = req->mtime;
+  ts[1].tv_nsec = (uint64_t)(req->mtime * 1000000) % 1000000 * 1000;
+
+  r = uv__utimesat(AT_FDCWD, req->path, ts, 0);
+  if (r == 0)
+    return r;
+
+  if (errno != ENOSYS)
+    return r;
+
+  no_utimesat = 1;
+
+skip:
+
+  tv[0].tv_sec  = req->atime;
+  tv[0].tv_usec = (uint64_t)(req->atime * 1000000) % 1000000;
+  tv[1].tv_sec  = req->mtime;
+  tv[1].tv_usec = (uint64_t)(req->mtime * 1000000) % 1000000;
+
+  r = utimes(req->path, tv);
+  if (r == 0)
+    return r;
+
+  switch (errno) {
+  case EACCES:
+  case ENOTDIR:
+    errno = ENOSYS;
+    break;
+  }
+
+  return r;
+
+#elif defined(__APPLE__)                                                      \
+    || defined(__DragonFly__)                                                 \
+    || defined(__FreeBSD__)                                                   \
+    || defined(__FreeBSD_kernel__)                                            \
+    || defined(__NetBSD__)                                                    \
+    || defined(__OpenBSD__)
+  struct timeval tv[2];
+  tv[0].tv_sec  = req->atime;
+  tv[0].tv_usec = (uint64_t)(req->atime * 1000000) % 1000000;
+  tv[1].tv_sec  = req->mtime;
+  tv[1].tv_usec = (uint64_t)(req->mtime * 1000000) % 1000000;
+  return utimes(req->path, tv);
+#elif defined(_AIX)                                                           \
+    && !defined(_AIX71)
   struct utimbuf buf;
   buf.actime = req->atime;
   buf.modtime = req->mtime;
-  return utime(req->path, &buf); /* TODO use utimes() where available */
+  return utime(req->path, &buf);
+#elif defined(_AIX71)                                                         \
+    || defined(__sun)
+  struct timespec ts[2];
+  ts[0].tv_sec  = req->atime;
+  ts[0].tv_nsec = (uint64_t)(req->atime * 1000000) % 1000000 * 1000;
+  ts[1].tv_sec  = req->mtime;
+  ts[1].tv_nsec = (uint64_t)(req->mtime * 1000000) % 1000000 * 1000;
+  return utimensat(AT_FDCWD, req->path, ts, 0);
+#elif defined(__MVS__)
+  attrib_t atr;
+  memset(&atr, 0, sizeof(atr));
+  atr.att_mtimechg = 1;
+  atr.att_atimechg = 1;
+  atr.att_mtime = req->mtime;
+  atr.att_atime = req->atime;
+  return __lchattr(req->path, &atr, sizeof(atr));
+#else
+  errno = ENOSYS;
+  return -1;
+#endif
 }