#include <dirent.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/stat.h> static void prepare (void); #define PREPARE(argc, argv) prepare () static int do_test (void); #define TEST_FUNCTION do_test () #include "../test-skeleton.c" static int dir_fd; static void prepare (void) { size_t test_dir_len = strlen (test_dir); static const char dir_name[] = "/tst-symlinkat.XXXXXX"; size_t dirbuflen = test_dir_len + sizeof (dir_name); char *dirbuf = malloc (dirbuflen); if (dirbuf == NULL) { puts ("out of memory"); exit (1); } snprintf (dirbuf, dirbuflen, "%s%s", test_dir, dir_name); if (mkdtemp (dirbuf) == NULL) { puts ("cannot create temporary directory"); exit (1); } add_temp_file (dirbuf); dir_fd = open (dirbuf, O_RDONLY | O_DIRECTORY); if (dir_fd == -1) { puts ("cannot open directory"); exit (1); } } static int do_test (void) { /* fdopendir takes over the descriptor, make a copy. */ int dupfd = dup (dir_fd); if (dupfd == -1) { puts ("dup failed"); return 1; } if (lseek (dupfd, 0, SEEK_SET) != 0) { puts ("1st lseek failed"); return 1; } /* The directory should be empty safe the . and .. files. */ DIR *dir = fdopendir (dupfd); if (dir == NULL) { puts ("fdopendir failed"); return 1; } struct dirent64 *d; while ((d = readdir64 (dir)) != NULL) if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0) { printf ("temp directory contains file \"%s\"\n", d->d_name); return 1; } closedir (dir); static const char symlinkcontent[] = "some-file"; if (symlinkat (symlinkcontent, dir_fd, "another-file") != 0) { puts ("symlinkat failed"); return 1; } struct stat64 st2; if (fstatat64 (dir_fd, "another-file", &st2, AT_SYMLINK_NOFOLLOW) != 0) { puts ("fstatat64 failed"); return 1; } if (!S_ISLNK (st2.st_mode)) { puts ("2nd fstatat64 does not show file is a symlink"); return 1; } if (fstatat64 (dir_fd, symlinkcontent, &st2, AT_SYMLINK_NOFOLLOW) == 0) { puts ("2nd fstatat64 succeeded"); return 1; } char buf[100]; int n = readlinkat (dir_fd, "another-file", buf, sizeof (buf)); if (n == -1) { puts ("readlinkat failed"); return 1; } if (n != sizeof (symlinkcontent) - 1) { printf ("readlinkat returned %d, expected %zu\n", n, sizeof (symlinkcontent) - 1); return 1; } if (strncmp (buf, symlinkcontent, n) != 0) { puts ("readlinkat retrieved wrong link content"); return 1; } if (unlinkat (dir_fd, "another-file", 0) != 0) { puts ("unlinkat failed"); return 1; } close (dir_fd); return 0; }