+int test_match(const char glob[], const char name[])
+{
+ static unsigned int page_size;
+ static char *pages;
+ char *test_glob;
+ char *test_name;
+ size_t length;
+ int res;
+
+ /* If we have not yet set up our test mappings, do so. */
+ if (!page_size)
+ {
+ int dev_zero_fd;
+
+ page_size = sysconf(_SC_PAGE_SIZE);
+ if (page_size == 0 || page_size == (unsigned int)-1)
+ {
+ fprintf(stderr, "sysconf(_SC_PAGE_SIZE) failed: %s\n", strerror(errno));
+ assert(0);
+ }
+ dev_zero_fd = open("/dev/zero", O_RDONLY);
+ /* If dev_zero_fd == -1 (failed), we may still be able to mmap anonymously. */
+ pages = mmap(NULL, 4 * page_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, dev_zero_fd, 0);
+ if (pages == MAP_FAILED)
+ {
+ /* Try using fd == -1 for MAP_ANONYMOUS, which BSD systems require. */
+ pages = mmap(NULL, 4 * page_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ }
+ if (pages == MAP_FAILED)
+ {
+ fprintf(stderr, "Unable to map pages: %s\n", strerror(errno));
+ assert(0);
+ }
+ if (dev_zero_fd >= 0)
+ {
+ close(dev_zero_fd);
+ dev_zero_fd = -1;
+ }
+ res = munmap(pages + page_size * 1, page_size);
+ if (res < 0)
+ {
+ fprintf(stderr, "Unable to unmap page 2/4: %s\n", strerror(errno));
+ /* Dysfunctional OSes */
+ }
+ munmap(pages + page_size * 3, page_size);
+ if (res < 0)
+ {
+ fprintf(stderr, "Unable to unmap page 4/4: %s\n", strerror(errno));
+ }
+ }
+
+ /* Copy the strings to the end of their respective pages. */
+ length = strlen(glob) + 1;
+ test_glob = pages + page_size * 1 - length;
+ memcpy(test_glob, glob, length);
+ length = strlen(name) + 1;
+ test_name = pages + page_size * 3 - length;
+ memcpy(test_name, name, length);
+
+ /* Perform the test. */
+ return match(test_glob, test_name);
+}
+