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316 lines
8.6 KiB
C
316 lines
8.6 KiB
C
/* Test pthread_setname_np and pthread_getname_np.
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Copyright (C) 2013-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <string.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <kernel-features.h>
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/* New name of process. */
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#define NEW_NAME "setname"
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/* Name of process which is one byte too big
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e.g. 17 bytes including null-terminator */
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#define BIG_NAME "....V....X....XV"
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/* Longest name of a process
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e.g. 16 bytes including null-terminator. */
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#define LONGEST_NAME "....V....X....X"
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/* One less than longest name with unique
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characters to detect modification. */
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#define CANARY_NAME "abcdefghijklmn"
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/* On Linux the maximum length of the name of a task *including* the null
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terminator. */
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#define TASK_COMM_LEN 16
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long
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gettid (void)
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{
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return syscall(__NR_gettid);
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}
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/* On Linux we can read this task's name from /proc. */
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int
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get_self_comm (long tid, char *buf, size_t len)
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{
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int res = 0;
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#define FMT "/proc/self/task/%lu/comm"
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char fname[sizeof (FMT) + 8];
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sprintf (fname, FMT, (unsigned long) tid);
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int fd = open (fname, O_RDONLY);
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if (fd == -1)
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return errno;
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ssize_t n = read (fd, (void *) buf, len);
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if (n < 0)
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res = errno;
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else
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{
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if (buf[n - 1] == '\n')
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buf[n - 1] = '\0';
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else if (n == len)
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res = ERANGE;
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else
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buf[n] = '\0';
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}
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close (fd);
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return res;
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}
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int
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do_test (int argc, char **argv)
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{
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pthread_t self;
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int res;
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int ret = 0;
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char name[TASK_COMM_LEN];
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char name_check[TASK_COMM_LEN];
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memset (name, '\0', TASK_COMM_LEN);
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memset (name_check, '\0', TASK_COMM_LEN);
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/* Test 1: Get the name of the task via pthread_getname_np and /proc
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and verify that they both match. */
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self = pthread_self ();
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res = pthread_getname_np (self, name, TASK_COMM_LEN);
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if (res == 0)
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{
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res = get_self_comm (gettid (), name_check, TASK_COMM_LEN);
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#ifndef __ASSUME_PROC_PID_TASK_COMM
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/* On this first test we look for ENOENT to be returned from
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get_self_comm to indicate that the kernel is older than
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2.6.33 and doesn't contain comm within the proc structure.
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In that case we skip the entire test. */
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if (res == ENOENT)
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{
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printf ("SKIP: The kernel does not have /proc/self/task/%%lu/comm.\n");
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return 0;
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}
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#endif
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if (res == 0)
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{
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if (strncmp (name, name_check, strlen (BIG_NAME)) == 0)
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printf ("PASS: Test 1 - pthread_getname_np and /proc agree.\n");
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else
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{
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printf ("FAIL: Test 1 - pthread_getname_np and /proc differ"
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" i.e. %s != %s\n", name, name_check);
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ret++;
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}
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}
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else
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{
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printf ("FAIL: Test 1 - unable read task name via proc.\n");
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ret++;
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}
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}
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else
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{
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printf ("FAIL: Test 1 - pthread_getname_np failed with error %d\n", res);
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ret++;
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}
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/* Test 2: Test setting the name and then independently verify it
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was set. */
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res = pthread_setname_np (self, NEW_NAME);
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if (res == 0)
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{
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res = get_self_comm (gettid (), name_check, TASK_COMM_LEN);
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if (res == 0)
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{
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if (strncmp (NEW_NAME, name_check, strlen (BIG_NAME)) == 0)
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printf ("PASS: Test 2 - Value used in pthread_setname_np and"
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" /proc agree.\n");
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else
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{
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printf ("FAIL: Test 2 - Value used in pthread_setname_np"
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" and /proc differ i.e. %s != %s\n",
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NEW_NAME, name_check);
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ret++;
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}
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}
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else
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{
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printf ("FAIL: Test 2 - unable to read task name via proc.\n");
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ret++;
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}
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}
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else
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{
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printf ("FAIL: Test 2 - pthread_setname_np failed with error %d\n", res);
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ret++;
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}
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/* Test 3: Test setting a name that is one-byte too big. */
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res = pthread_getname_np (self, name, TASK_COMM_LEN);
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if (res == 0)
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{
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res = pthread_setname_np (self, BIG_NAME);
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if (res != 0)
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{
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if (res == ERANGE)
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{
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printf ("PASS: Test 3 - pthread_setname_np returned ERANGE"
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" for a process name that was too long.\n");
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/* Verify the old name didn't change. */
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res = get_self_comm (gettid (), name_check, TASK_COMM_LEN);
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if (res == 0)
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{
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if (strncmp (name, name_check, strlen (BIG_NAME)) == 0)
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printf ("PASS: Test 3 - Original name unchanged after"
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" pthread_setname_np returned ERANGE.\n");
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else
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{
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printf ("FAIL: Test 3 - Original name changed after"
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" pthread_setname_np returned ERANGE"
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" i.e. %s != %s\n",
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name, name_check);
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ret++;
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}
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}
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else
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{
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printf ("FAIL: Test 3 - unable to read task name.\n");
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ret++;
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}
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}
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else
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{
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printf ("FAIL: Test 3 - Wrong error returned"
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" i.e. ERANGE != %d\n", res);
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ret++;
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}
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}
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else
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{
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printf ("FAIL: Test 3 - Too-long name accepted by"
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" pthread_setname_np.\n");
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ret++;
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}
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}
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else
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{
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printf ("FAIL: Test 3 - Unable to get original name.\n");
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ret++;
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}
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/* Test 4: Verify that setting the longest name works. */
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res = pthread_setname_np (self, LONGEST_NAME);
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if (res == 0)
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{
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res = get_self_comm (gettid (), name_check, TASK_COMM_LEN);
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if (res == 0)
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{
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if (strncmp (LONGEST_NAME, name_check, strlen (BIG_NAME)) == 0)
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printf ("PASS: Test 4 - Longest name set via pthread_setname_np"
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" agrees with /proc.\n");
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else
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{
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printf ("FAIL: Test 4 - Value used in pthread_setname_np and /proc"
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" differ i.e. %s != %s\n", LONGEST_NAME, name_check);
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ret++;
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}
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}
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else
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{
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printf ("FAIL: Test 4 - unable to read task name via proc.\n");
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ret++;
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}
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}
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else
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{
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printf ("FAIL: Test 4 - pthread_setname_np failed with error %d\n", res);
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ret++;
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}
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/* Test 5: Verify that getting a long name into a small buffer fails. */
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strncpy (name, CANARY_NAME, strlen (CANARY_NAME) + 1);
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/* Claim the buffer length is strlen (LONGEST_NAME). This is one character
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too small to hold LONGEST_NAME *and* the null terminator. We should get
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back ERANGE and name should be unmodified. */
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res = pthread_getname_np (self, name, strlen (LONGEST_NAME));
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if (res != 0)
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{
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if (res == ERANGE)
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{
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if (strncmp (CANARY_NAME, name, strlen (BIG_NAME)) == 0)
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{
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printf ("PASS: Test 5 - ERANGE and buffer unmodified.\n");
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}
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else
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{
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printf ("FAIL: Test 5 - Original buffer modified.\n");
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ret++;
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}
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}
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else
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{
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printf ("FAIL: Test 5 - Did not return ERANGE for small buffer.\n");
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ret++;
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}
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}
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else
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{
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printf ("FAIL: Test 5 - Returned name longer than buffer.\n");
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ret++;
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}
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/* Test 6: Lastly make sure we can read back the longest name. */
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res = pthread_getname_np (self, name, strlen (LONGEST_NAME) + 1);
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if (res == 0)
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{
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if (strncmp (LONGEST_NAME, name, strlen (BIG_NAME)) == 0)
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{
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printf ("PASS: Test 6 - Read back longest name correctly.\n");
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}
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else
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{
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printf ("FAIL: Test 6 - Read \"%s\" instead of longest name.\n",
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name);
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ret++;
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}
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}
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else
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{
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printf ("FAIL: Test 6 - pthread_getname_np failed with error %d\n", res);
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ret++;
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}
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return ret;
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}
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#include <test-skeleton.c>
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