#include <dirent.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.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-openat.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); /* Try to create a file. */ int fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666); if (fd == -1) { if (errno == ENOSYS) { puts ("*at functions not supported"); return 0; } puts ("file creation failed"); return 1; } write (fd, "hello", 5); /* Before closing the file, try using this file descriptor to open another file. This must fail. */ int fd2 = openat (fd, "should-not-work", O_CREAT|O_RDWR, 0666); if (fd2 != -1) { puts ("openat using descriptor for normal file worked"); return 1; } if (errno != ENOTDIR) { puts ("error for openat using descriptor for normal file not ENOTDIR "); return 1; } close (fd); puts ("file created"); /* fdopendir takes over the descriptor, make a copy. */ dupfd = dup (dir_fd); if (dupfd == -1) { puts ("dup failed"); return 1; } if (lseek (dupfd, 0, SEEK_SET) != 0) { puts ("2nd lseek failed"); return 1; } /* The directory should be empty safe the . and .. files. */ dir = fdopendir (dupfd); if (dir == NULL) { puts ("fdopendir failed"); return 1; } bool seen_file = false; while ((d = readdir64 (dir)) != NULL) if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0) { if (strcmp (d->d_name, "some-file") != 0) { printf ("temp directory contains file \"%s\"\n", d->d_name); return 1; } seen_file = true; } closedir (dir); if (!seen_file) { puts ("file not created in correct directory"); return 1; } int cwdfd = open (".", O_RDONLY | O_DIRECTORY); if (cwdfd == -1) { puts ("cannot get descriptor for cwd"); return 1; } if (fchdir (dir_fd) != 0) { puts ("1st fchdir failed"); return 1; } if (unlink ("some-file") != 0) { puts ("unlink failed"); return 1; } if (fchdir (cwdfd) != 0) { puts ("2nd fchdir failed"); return 1; } close (dir_fd); close (cwdfd); /* With the file descriptor closed the next call must fail. */ fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666); if (fd != -1) { puts ("openat using closed descriptor succeeded"); return 1; } if (errno != EBADF) { puts ("openat using closed descriptor did not set EBADF"); return 1; } fd = openat (-1, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666); if (fd != -1) { puts ("openat using -1 descriptor succeeded"); return 1; } if (errno != EBADF) { puts ("openat using -1 descriptor did not set EBADF"); return 1; } return 0; }