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0387662d1b
Makefile contains -D_GNU_SOURCE. remove define "_GNU_SOURCE" in c files. Signed-off-by: Peng Hao <peng.hao2@zte.com.cn> Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>
169 lines
3.6 KiB
C
169 lines
3.6 KiB
C
/*
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* Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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// Test /proc/*/fd lookup.
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#undef NDEBUG
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#include <assert.h>
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#include <dirent.h>
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#include <errno.h>
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#include <limits.h>
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#include <sched.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "proc.h"
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/* lstat(2) has more "coverage" in case non-symlink pops up somehow. */
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static void test_lookup_pass(const char *pathname)
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{
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struct stat st;
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ssize_t rv;
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memset(&st, 0, sizeof(struct stat));
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rv = lstat(pathname, &st);
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assert(rv == 0);
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assert(S_ISLNK(st.st_mode));
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}
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static void test_lookup_fail(const char *pathname)
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{
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struct stat st;
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ssize_t rv;
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rv = lstat(pathname, &st);
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assert(rv == -1 && errno == ENOENT);
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}
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static void test_lookup(unsigned int fd)
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{
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char buf[64];
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unsigned int c;
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unsigned int u;
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int i;
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snprintf(buf, sizeof(buf), "/proc/self/fd/%u", fd);
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test_lookup_pass(buf);
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/* leading junk */
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for (c = 1; c <= 255; c++) {
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if (c == '/')
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continue;
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snprintf(buf, sizeof(buf), "/proc/self/fd/%c%u", c, fd);
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test_lookup_fail(buf);
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}
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/* trailing junk */
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for (c = 1; c <= 255; c++) {
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if (c == '/')
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continue;
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snprintf(buf, sizeof(buf), "/proc/self/fd/%u%c", fd, c);
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test_lookup_fail(buf);
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}
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for (i = INT_MIN; i < INT_MIN + 1024; i++) {
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snprintf(buf, sizeof(buf), "/proc/self/fd/%d", i);
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test_lookup_fail(buf);
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}
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for (i = -1024; i < 0; i++) {
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snprintf(buf, sizeof(buf), "/proc/self/fd/%d", i);
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test_lookup_fail(buf);
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}
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for (u = INT_MAX - 1024; u <= (unsigned int)INT_MAX + 1024; u++) {
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snprintf(buf, sizeof(buf), "/proc/self/fd/%u", u);
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test_lookup_fail(buf);
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}
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for (u = UINT_MAX - 1024; u != 0; u++) {
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snprintf(buf, sizeof(buf), "/proc/self/fd/%u", u);
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test_lookup_fail(buf);
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}
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}
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int main(void)
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{
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struct dirent *de;
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unsigned int fd, target_fd;
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if (unshare(CLONE_FILES) == -1)
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return 1;
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/* Wipe fdtable. */
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do {
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DIR *d;
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d = opendir("/proc/self/fd");
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if (!d)
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return 1;
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de = xreaddir(d);
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assert(de->d_type == DT_DIR);
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assert(streq(de->d_name, "."));
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de = xreaddir(d);
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assert(de->d_type == DT_DIR);
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assert(streq(de->d_name, ".."));
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next:
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de = xreaddir(d);
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if (de) {
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unsigned long long fd_ull;
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unsigned int fd;
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char *end;
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assert(de->d_type == DT_LNK);
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fd_ull = xstrtoull(de->d_name, &end);
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assert(*end == '\0');
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assert(fd_ull == (unsigned int)fd_ull);
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fd = fd_ull;
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if (fd == dirfd(d))
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goto next;
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close(fd);
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}
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closedir(d);
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} while (de);
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/* Now fdtable is clean. */
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fd = open("/", O_PATH|O_DIRECTORY);
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assert(fd == 0);
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test_lookup(fd);
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close(fd);
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/* Clean again! */
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fd = open("/", O_PATH|O_DIRECTORY);
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assert(fd == 0);
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/* Default RLIMIT_NOFILE-1 */
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target_fd = 1023;
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while (target_fd > 0) {
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if (dup2(fd, target_fd) == target_fd)
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break;
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target_fd /= 2;
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}
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assert(target_fd > 0);
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close(fd);
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test_lookup(target_fd);
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close(target_fd);
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return 0;
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}
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