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glibc/io/tst-openat.c
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#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; | |
} |