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#include <stdlib.h>
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <file_lib.h>
/**
* This file contains file-locking tests that need to fork() a child process
* which totally confuses the unit test framework used by the other tests.
*/
#if defined(__ANDROID__)
# define TEMP_DIR "/data/data/com.termux/files/usr/tmp"
#else
# define TEMP_DIR "/tmp/file_lib_test"
#endif
#define TEST_FILE "file_lib_test.txt"
static bool failure = false;
#define assert_int_equal(expr1, expr2) \
if ((expr1) != (expr2)) \
{ \
fprintf(stderr, "FAIL: "#expr1" != "#expr2" [%d != %d] (%s:%d)\n", (expr1), (expr2), __FILE__, __LINE__); \
failure = true; \
}
#define assert_true(expr) \
if (!(expr)) \
{ \
fprintf(stderr, "FAIL: "#expr" is FALSE (%s:%d)\n", __FILE__, __LINE__); \
failure = true; \
}
#define assert_false(expr) \
if ((expr)) \
{ \
fprintf(stderr, "FAIL: "#expr" is TRUE (%s:%d)\n", __FILE__, __LINE__); \
failure = true; \
}
static void clear_tempfiles()
{
unlink(TEMP_DIR "/" TEST_FILE);
rmdir(TEMP_DIR);
}
int main()
{
atexit(&clear_tempfiles);
mkdir(TEMP_DIR, 0755);
/* TEST CASE 1 -- excl. lock in parent, try excl. lock in child */
FileLock lock = EMPTY_FILE_LOCK;
int fd = open(TEMP_DIR "/" TEST_FILE, O_CREAT | O_RDWR, 0644);
lock.fd = fd;
/* lock trying to wait */
assert_int_equal(ExclusiveFileLock(&lock, true), 0);
/* FD should not be changed */
assert_int_equal(lock.fd, fd);
/* we would be able to acquire the lock (we already have it) */
assert_true(ExclusiveFileLockCheck(&lock));
pid_t pid = fork();
if (pid == 0)
{
/* child */
failure = false;
/* FDs are inherited, fcntl() locks are not */
/* the lock is held by the parent process */
assert_false(ExclusiveFileLockCheck(&lock));
/* try to lock without waiting */
assert_int_equal(ExclusiveFileLock(&lock, false), -1);
/* should not affect parent's FD */
close(fd);
_exit(failure ? 1 : 0);
}
else
{
/* parent */
int status;
int ret = waitpid(pid, &status, 0);
assert_int_equal(ret, pid);
failure = (WEXITSTATUS(status) != 0);
}
/* unlock, but keep the FD open */
assert_int_equal(ExclusiveFileUnlock(&lock, false), 0);
/* should be able to close */
assert_int_equal(close(lock.fd), 0);
/* TEST CASE 2 -- shared lock in parent, try excl. lock in child, get shared
* lock in child, get excl. lock in parent */
fd = open(TEMP_DIR "/" TEST_FILE, O_CREAT | O_RDWR, 0644);
lock.fd = fd;
/* SHARED lock trying to wait */
assert_int_equal(SharedFileLock(&lock, true), 0);
/* FD should not be changed */
assert_int_equal(lock.fd, fd);
pid = fork();
if (pid == 0)
{
/* child */
failure = false;
/* FDs are inherited, fcntl() locks are not */
/* a shared lock is held by the parent process */
assert_false(ExclusiveFileLockCheck(&lock));
/* try to lock without waiting */
assert_int_equal(ExclusiveFileLock(&lock, false), -1);
/* try to get a shared lock without waiting */
assert_int_equal(SharedFileLock(&lock, false), 0);
/* should not affect parent's lock or FD */
assert_int_equal(SharedFileUnlock(&lock, true), 0);
_exit(failure ? 1 : 0);
}
else
{
/* parent */
int status;
int ret = waitpid(pid, &status, 0);
assert_int_equal(ret, pid);
failure = (WEXITSTATUS(status) != 0);
}
/* we are holding a shared lock so WE should be able to get an exclusive
* lock */
assert_true(ExclusiveFileLockCheck(&lock));
/* upgrade the lock to an exclusive one */
assert_int_equal(ExclusiveFileLock(&lock, true), 0);
/* unlock, but keep the FD open */
assert_int_equal(ExclusiveFileUnlock(&lock, false), 0);
/* should be able to close both FDs */
assert_int_equal(close(lock.fd), 0);
if (failure)
{
fprintf(stderr, "FAILED\n");
return 1;
}
else
{
fprintf(stderr, "SUCCESS\n");
return 0;
}
}
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