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      1 /* Copyright libuv contributors. All rights reserved.
      2  *
      3  * Permission is hereby granted, free of charge, to any person obtaining a copy
      4  * of this software and associated documentation files (the "Software"), to
      5  * deal in the Software without restriction, including without limitation the
      6  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
      7  * sell copies of the Software, and to permit persons to whom the Software is
      8  * furnished to do so, subject to the following conditions:
      9  *
     10  * The above copyright notice and this permission notice shall be included in
     11  * all copies or substantial portions of the Software.
     12  *
     13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     15  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     16  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     17  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     18  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     19  * IN THE SOFTWARE.
     20  */
     21 
     22 #include "uv.h"
     23 #include "task.h"
     24 
     25 
     26 TEST_IMPL(process_priority) {
     27   int priority;
     28   int r;
     29   int i;
     30 
     31 #if defined(__MVS__)
     32   if (uv_os_setpriority(0, 0) == UV_ENOSYS)
     33     RETURN_SKIP("functionality not supported on zOS");
     34 #endif
     35 
     36   /* Verify that passing a NULL pointer returns UV_EINVAL. */
     37   r = uv_os_getpriority(0, NULL);
     38   ASSERT_EQ(r, UV_EINVAL);
     39 
     40   /* Verify that all valid values work. */
     41   for (i = UV_PRIORITY_HIGHEST; i <= UV_PRIORITY_LOW; i++) {
     42     r = uv_os_setpriority(0, i);
     43 
     44     /* If UV_EACCES is returned, the current user doesn't have permission to
     45        set this specific priority. */
     46     if (r == UV_EACCES)
     47       continue;
     48 
     49     ASSERT_OK(r);
     50     ASSERT_OK(uv_os_getpriority(0, &priority));
     51 
     52     /* Verify that the priority values match on Unix, and are range mapped
     53        on Windows. */
     54 #ifndef _WIN32
     55     ASSERT_EQ(priority, i);
     56 #else
     57     /* On Windows, only elevated users can set UV_PRIORITY_HIGHEST. Other
     58        users will silently be set to UV_PRIORITY_HIGH. */
     59     if (i < UV_PRIORITY_HIGH)
     60       ASSERT(priority == UV_PRIORITY_HIGHEST || priority == UV_PRIORITY_HIGH);
     61     else if (i < UV_PRIORITY_ABOVE_NORMAL)
     62       ASSERT_EQ(priority, UV_PRIORITY_HIGH);
     63     else if (i < UV_PRIORITY_NORMAL)
     64       ASSERT_EQ(priority, UV_PRIORITY_ABOVE_NORMAL);
     65     else if (i < UV_PRIORITY_BELOW_NORMAL)
     66       ASSERT_EQ(priority, UV_PRIORITY_NORMAL);
     67     else if (i < UV_PRIORITY_LOW)
     68       ASSERT_EQ(priority, UV_PRIORITY_BELOW_NORMAL);
     69     else
     70       ASSERT_EQ(priority, UV_PRIORITY_LOW);
     71 #endif
     72 
     73     /* Verify that the current PID and 0 are equivalent. */
     74     ASSERT_OK(uv_os_getpriority(uv_os_getpid(), &r));
     75     ASSERT_EQ(priority, r);
     76   }
     77 
     78   /* Verify that invalid priorities return UV_EINVAL. */
     79   ASSERT_EQ(uv_os_setpriority(0, UV_PRIORITY_HIGHEST - 1), UV_EINVAL);
     80   ASSERT_EQ(uv_os_setpriority(0, UV_PRIORITY_LOW + 1), UV_EINVAL);
     81 
     82   return 0;
     83 }
     84