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/* Test pthread_setname_np and pthread_getname_np.
Copyright (C) 2013-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
/* New name of process. */
#define NEW_NAME "setname"
/* Name of process which is one byte too big
e.g. 17 bytes including null-terminator */
#define BIG_NAME "....V....X....XV"
/* Longest name of a process
e.g. 16 bytes including null-terminator. */
#define LONGEST_NAME "....V....X....X"
/* One less than longest name with unique
characters to detect modification. */
#define CANARY_NAME "abcdefghijklmn"
/* On Linux the maximum length of the name of a task *including* the null
terminator. */
#define TASK_COMM_LEN 16
/* On Linux we can read this task's name from /proc. */
int
get_self_comm (long tid, char *buf, size_t len)
{
int res = 0;
#define FMT "/proc/self/task/%lu/comm"
char fname[sizeof (FMT) + 32];
sprintf (fname, FMT, (unsigned long) tid);
int fd = open (fname, O_RDONLY);
if (fd == -1)
return errno;
ssize_t n = read (fd, (void *) buf, len);
if (n < 0)
res = errno;
else
{
if (buf[n - 1] == '\n')
buf[n - 1] = '\0';
else if (n == len)
res = ERANGE;
else
buf[n] = '\0';
}
close (fd);
return res;
}
int
do_test (int argc, char **argv)
{
pthread_t self;
int res;
int ret = 0;
char name[TASK_COMM_LEN];
char name_check[TASK_COMM_LEN];
memset (name, '\0', TASK_COMM_LEN);
memset (name_check, '\0', TASK_COMM_LEN);
/* Test 1: Get the name of the task via pthread_getname_np and /proc
and verify that they both match. */
self = pthread_self ();
res = pthread_getname_np (self, name, TASK_COMM_LEN);
if (res == 0)
{
res = get_self_comm (gettid (), name_check, TASK_COMM_LEN);
if (res == 0)
{
if (strncmp (name, name_check, strlen (BIG_NAME)) == 0)
printf ("PASS: Test 1 - pthread_getname_np and /proc agree.\n");
else
{
printf ("FAIL: Test 1 - pthread_getname_np and /proc differ"
" i.e. %s != %s\n", name, name_check);
ret++;
}
}
else
{
printf ("FAIL: Test 1 - unable read task name via proc.\n");
ret++;
}
}
else
{
printf ("FAIL: Test 1 - pthread_getname_np failed with error %d\n", res);
ret++;
}
/* Test 2: Test setting the name and then independently verify it
was set. */
res = pthread_setname_np (self, NEW_NAME);
if (res == 0)
{
res = get_self_comm (gettid (), name_check, TASK_COMM_LEN);
if (res == 0)
{
if (strncmp (NEW_NAME, name_check, strlen (BIG_NAME)) == 0)
printf ("PASS: Test 2 - Value used in pthread_setname_np and"
" /proc agree.\n");
else
{
printf ("FAIL: Test 2 - Value used in pthread_setname_np"
" and /proc differ i.e. %s != %s\n",
NEW_NAME, name_check);
ret++;
}
}
else
{
printf ("FAIL: Test 2 - unable to read task name via proc.\n");
ret++;
}
}
else
{
printf ("FAIL: Test 2 - pthread_setname_np failed with error %d\n", res);
ret++;
}
/* Test 3: Test setting a name that is one-byte too big. */
res = pthread_getname_np (self, name, TASK_COMM_LEN);
if (res == 0)
{
res = pthread_setname_np (self, BIG_NAME);
if (res != 0)
{
if (res == ERANGE)
{
printf ("PASS: Test 3 - pthread_setname_np returned ERANGE"
" for a process name that was too long.\n");
/* Verify the old name didn't change. */
res = get_self_comm (gettid (), name_check, TASK_COMM_LEN);
if (res == 0)
{
if (strncmp (name, name_check, strlen (BIG_NAME)) == 0)
printf ("PASS: Test 3 - Original name unchanged after"
" pthread_setname_np returned ERANGE.\n");
else
{
printf ("FAIL: Test 3 - Original name changed after"
" pthread_setname_np returned ERANGE"
" i.e. %s != %s\n",
name, name_check);
ret++;
}
}
else
{
printf ("FAIL: Test 3 - unable to read task name.\n");
ret++;
}
}
else
{
printf ("FAIL: Test 3 - Wrong error returned"
" i.e. ERANGE != %d\n", res);
ret++;
}
}
else
{
printf ("FAIL: Test 3 - Too-long name accepted by"
" pthread_setname_np.\n");
ret++;
}
}
else
{
printf ("FAIL: Test 3 - Unable to get original name.\n");
ret++;
}
/* Test 4: Verify that setting the longest name works. */
res = pthread_setname_np (self, LONGEST_NAME);
if (res == 0)
{
res = get_self_comm (gettid (), name_check, TASK_COMM_LEN);
if (res == 0)
{
if (strncmp (LONGEST_NAME, name_check, strlen (BIG_NAME)) == 0)
printf ("PASS: Test 4 - Longest name set via pthread_setname_np"
" agrees with /proc.\n");
else
{
printf ("FAIL: Test 4 - Value used in pthread_setname_np and /proc"
" differ i.e. %s != %s\n", LONGEST_NAME, name_check);
ret++;
}
}
else
{
printf ("FAIL: Test 4 - unable to read task name via proc.\n");
ret++;
}
}
else
{
printf ("FAIL: Test 4 - pthread_setname_np failed with error %d\n", res);
ret++;
}
/* Test 5: Verify that getting a long name into a small buffer fails. */
strncpy (name, CANARY_NAME, strlen (CANARY_NAME) + 1);
/* Claim the buffer length is strlen (LONGEST_NAME). This is one character
too small to hold LONGEST_NAME *and* the null terminator. We should get
back ERANGE and name should be unmodified. */
res = pthread_getname_np (self, name, strlen (LONGEST_NAME));
if (res != 0)
{
if (res == ERANGE)
{
if (strncmp (CANARY_NAME, name, strlen (BIG_NAME)) == 0)
{
printf ("PASS: Test 5 - ERANGE and buffer unmodified.\n");
}
else
{
printf ("FAIL: Test 5 - Original buffer modified.\n");
ret++;
}
}
else
{
printf ("FAIL: Test 5 - Did not return ERANGE for small buffer.\n");
ret++;
}
}
else
{
printf ("FAIL: Test 5 - Returned name longer than buffer.\n");
ret++;
}
/* Test 6: Lastly make sure we can read back the longest name. */
res = pthread_getname_np (self, name, strlen (LONGEST_NAME) + 1);
if (res == 0)
{
if (strncmp (LONGEST_NAME, name, strlen (BIG_NAME)) == 0)
{
printf ("PASS: Test 6 - Read back longest name correctly.\n");
}
else
{
printf ("FAIL: Test 6 - Read \"%s\" instead of longest name.\n",
name);
ret++;
}
}
else
{
printf ("FAIL: Test 6 - pthread_getname_np failed with error %d\n", res);
ret++;
}
return ret;
}
#include <test-skeleton.c>
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