diff options
Diffstat (limited to 'io/tst-openat.c')
| -rw-r--r-- | io/tst-openat.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/io/tst-openat.c b/io/tst-openat.c new file mode 100644 index 0000000000..0ceb745880 --- /dev/null +++ b/io/tst-openat.c @@ -0,0 +1,209 @@ +#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; +} |