unix, windows: add uv_fs_mkdtemp

include/uv.h

@@ -1849,6 +1849,7 @@ typedef enum {
   UV_FS_UNLINK,
   UV_FS_RMDIR,
   UV_FS_MKDIR,
+  UV_FS_MKDTEMP,
   UV_FS_RENAME,
   UV_FS_READDIR,
   UV_FS_LINK,
@@ -1891,6 +1892,9 @@ UV_EXTERN int uv_fs_write(uv_loop_t* loop, uv_fs_t* req, uv_file file,
 UV_EXTERN int uv_fs_mkdir(uv_loop_t* loop, uv_fs_t* req, const char* path,
     int mode, uv_fs_cb cb);
 
+UV_EXTERN int uv_fs_mkdtemp(uv_loop_t* loop, uv_fs_t* req, const char* template,
+    uv_fs_cb cb);
+
 UV_EXTERN int uv_fs_rmdir(uv_loop_t* loop, uv_fs_t* req, const char* path,
     uv_fs_cb cb);
 

src/unix/fs.c

@@ -214,6 +214,11 @@ skip:
 }
 
 
+static ssize_t uv__fs_mkdtemp(uv_fs_t* req) {
+  return mkdtemp((char*) req->path) ? 0 : -1;
+}
+
+
 static ssize_t uv__fs_read(uv_fs_t* req) {
   ssize_t result;
 
@@ -789,6 +794,7 @@ static void uv__fs_work(struct uv__work* w) {
     X(LSTAT, uv__fs_lstat(req->path, &req->statbuf));
     X(LINK, link(req->path, req->new_path));
     X(MKDIR, mkdir(req->path, req->mode));
+    X(MKDTEMP, uv__fs_mkdtemp(req));
     X(READ, uv__fs_read(req));
     X(READDIR, uv__fs_readdir(req));
     X(READLINK, uv__fs_readlink(req));
@@ -1001,6 +1007,18 @@ int uv_fs_mkdir(uv_loop_t* loop,
 }
 
 
+int uv_fs_mkdtemp(uv_loop_t* loop,
+                  uv_fs_t* req,
+                  const char* template,
+                  uv_fs_cb cb) {
+  INIT(MKDTEMP);
+  req->path = strdup(template);
+  if (req->path == NULL)
+    return -ENOMEM;
+  POST;
+}
+
+
 int uv_fs_open(uv_loop_t* loop,
                uv_fs_t* req,
                const char* path,

src/win/fs.c

@@ -721,6 +721,78 @@ void fs__mkdir(uv_fs_t* req) {
 }
 
 
+/* Some parts of the implementation were borrowed from glibc. */
+void fs__mkdtemp(uv_fs_t* req) {
+  static const WCHAR letters[] =
+    L"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+  size_t len;
+  WCHAR* template_part;
+  static uint64_t value;
+  unsigned int count;
+  int fd;
+
+  /* A lower bound on the number of temporary files to attempt to
+     generate. The maximum total number of temporary file names that
+     can exist for a given template is 62**6. It should never be
+     necessary to try all these combinations. Instead if a reasonable
+     number of names is tried (we define reasonable as 62**3) fail to
+     give the system administrator the chance to remove the problems. */
+#define ATTEMPTS_MIN (62 * 62 * 62)
+
+  /* The number of times to attempt to generate a temporary file. To
+     conform to POSIX, this must be no smaller than TMP_MAX. */
+#if ATTEMPTS_MIN < TMP_MAX
+  unsigned int attempts = TMP_MAX;
+#else
+  unsigned int attempts = ATTEMPTS_MIN;
+#endif
+
+  len = wcslen(req->pathw);
+  if (len < 6 || wcsncmp(&req->pathw[len - 6], L"XXXXXX", 6)) {
+    SET_REQ_UV_ERROR(req, UV_EINVAL, ERROR_INVALID_PARAMETER);
+    return;
+  }
+
+  /* This is where the Xs start. */
+  template_part = &req->pathw[len - 6];
+
+  /* Get some random data. */
+  value += uv_hrtime() ^ _getpid();
+
+  for (count = 0; count < attempts; value += 7777, ++count) {
+    uint64_t v = value;
+
+    /* Fill in the random bits. */
+    template_part[0] = letters[v % 62];
+    v /= 62;
+    template_part[1] = letters[v % 62];
+    v /= 62;
+    template_part[2] = letters[v % 62];
+    v /= 62;
+    template_part[3] = letters[v % 62];
+    v /= 62;
+    template_part[4] = letters[v % 62];
+    v /= 62;
+    template_part[5] = letters[v % 62];
+
+    fd = _wmkdir(req->pathw);
+
+    if (fd >= 0) {
+      len = strlen(req->path);
+      wcstombs((char*) req->path + len - 6, template_part, 6);
+      SET_REQ_RESULT(req, 0);
+      return;
+    } else if (errno != EEXIST) {
+      SET_REQ_RESULT(req, -1);
+      return;
+    }
+  }
+
+  /* We got out of the loop because we ran out of combinations to try. */
+  SET_REQ_RESULT(req, -1);
+}
+
+
 void fs__readdir(uv_fs_t* req) {
   WCHAR* pathw = req->pathw;
   size_t len = wcslen(pathw);
@@ -1528,6 +1600,7 @@ static void uv__fs_work(struct uv__work* w) {
     XX(UNLINK, unlink)
     XX(RMDIR, rmdir)
     XX(MKDIR, mkdir)
+    XX(MKDTEMP, mkdtemp)
     XX(RENAME, rename)
     XX(READDIR, readdir)
     XX(LINK, link)
@@ -1724,6 +1797,26 @@ int uv_fs_mkdir(uv_loop_t* loop, uv_fs_t* req, const char* path, int mode,
 }
 
 
+int uv_fs_mkdtemp(uv_loop_t* loop, uv_fs_t* req, const char* template,
+    uv_fs_cb cb) {
+  int err;
+
+  uv_fs_req_init(loop, req, UV_FS_MKDTEMP, cb);
+
+  err = fs__capture_path(loop, req, template, NULL, TRUE);
+  if (err)
+    return uv_translate_sys_error(err);
+
+  if (cb) {
+    QUEUE_FS_TP_JOB(loop, req);
+    return 0;
+  } else {
+    fs__mkdtemp(req);
+    return req->result;
+  }
+}
+
+
 int uv_fs_rmdir(uv_loop_t* loop, uv_fs_t* req, const char* path, uv_fs_cb cb) {
   int err;
 

test/test-fs.c

@@ -65,6 +65,7 @@ static int read_cb_count;
 static int write_cb_count;
 static int unlink_cb_count;
 static int mkdir_cb_count;
+static int mkdtemp_cb_count;
 static int rmdir_cb_count;
 static int readdir_cb_count;
 static int stat_cb_count;
@@ -93,6 +94,8 @@ static uv_fs_t write_req;
 static uv_fs_t unlink_req;
 static uv_fs_t close_req;
 static uv_fs_t mkdir_req;
+static uv_fs_t mkdtemp_req1;
+static uv_fs_t mkdtemp_req2;
 static uv_fs_t rmdir_req;
 static uv_fs_t readdir_req;
 static uv_fs_t stat_req;
@@ -376,6 +379,32 @@ static void mkdir_cb(uv_fs_t* req) {
 }
 
 
+static void check_mkdtemp_result(uv_fs_t* req) {
+  int r;
+
+  ASSERT(req->fs_type == UV_FS_MKDTEMP);
+  ASSERT(req->result == 0);
+  ASSERT(req->path);
+  ASSERT(strlen(req->path) == 15);
+  ASSERT(memcmp(req->path, "test_dir_", 9) == 0);
+  ASSERT(memcmp(req->path + 9, "XXXXXX", 6) != 0);
+  check_permission(req->path, 0700);
+
+  /* Check if req->path is actually a directory */
+  r = uv_fs_stat(uv_default_loop(), &stat_req, req->path, NULL);
+  ASSERT(r == 0);
+  ASSERT(((uv_stat_t*)stat_req.ptr)->st_mode & S_IFDIR);
+  uv_fs_req_cleanup(&stat_req);
+}
+
+
+static void mkdtemp_cb(uv_fs_t* req) {
+  ASSERT(req == &mkdtemp_req1);
+  check_mkdtemp_result(req);
+  mkdtemp_cb_count++;
+}
+
+
 static void rmdir_cb(uv_fs_t* req) {
   ASSERT(req == &rmdir_req);
   ASSERT(req->fs_type == UV_FS_RMDIR);
@@ -927,6 +956,37 @@ TEST_IMPL(fs_async_sendfile) {
 }
 
 
+TEST_IMPL(fs_mkdtemp) {
+  int r;
+  const char* path_template = "test_dir_XXXXXX";
+
+  loop = uv_default_loop();
+
+  r = uv_fs_mkdtemp(loop, &mkdtemp_req1, path_template, mkdtemp_cb);
+  ASSERT(r == 0);
+
+  uv_run(loop, UV_RUN_DEFAULT);
+  ASSERT(mkdtemp_cb_count == 1);
+
+  /* sync mkdtemp */
+  r = uv_fs_mkdtemp(loop, &mkdtemp_req2, path_template, NULL);
+  ASSERT(r == 0);
+  check_mkdtemp_result(&mkdtemp_req2);
+
+  /* mkdtemp return different values on subsequent calls */
+  ASSERT(strcmp(mkdtemp_req1.path, mkdtemp_req2.path) != 0);
+
+  /* Cleanup */
+  rmdir(mkdtemp_req1.path);
+  rmdir(mkdtemp_req2.path);
+  uv_fs_req_cleanup(&mkdtemp_req1);
+  uv_fs_req_cleanup(&mkdtemp_req2);
+
+  MAKE_VALGRIND_HAPPY();
+  return 0;
+}
+
+
 TEST_IMPL(fs_fstat) {
   int r;
   uv_fs_t req;

test/test-list.h

@@ -200,6 +200,7 @@ TEST_DECLARE   (fs_file_sync)
 TEST_DECLARE   (fs_file_write_null_buffer)
 TEST_DECLARE   (fs_async_dir)
 TEST_DECLARE   (fs_async_sendfile)
+TEST_DECLARE   (fs_mkdtemp)
 TEST_DECLARE   (fs_fstat)
 TEST_DECLARE   (fs_chmod)
 TEST_DECLARE   (fs_chown)
@@ -548,6 +549,7 @@ TASK_LIST_START
   TEST_ENTRY  (fs_file_write_null_buffer)
   TEST_ENTRY  (fs_async_dir)
   TEST_ENTRY  (fs_async_sendfile)
+  TEST_ENTRY  (fs_mkdtemp)
   TEST_ENTRY  (fs_fstat)
   TEST_ENTRY  (fs_chmod)
   TEST_ENTRY  (fs_chown)