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#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <utime.h>
#include <sys/stat.h>
#include <sys/types.h>
void create_file(const char *path, const char *buffer, int mode) {
int fd = open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
assert(fd >= 0);
int err = write(fd, buffer, sizeof(char) * strlen(buffer));
assert(err == (sizeof(char) * strlen(buffer)));
close(fd);
}
void setup() {
create_file("file", "abcdef", 0777);
symlink("file", "file-link");
// some platforms use 777, some use 755 by default for symlinks
// make sure we're using 777 for the test
lchmod("file-link", 0777);
mkdir("folder", 0777);
}
void cleanup() {
unlink("file-link");
unlink("file");
rmdir("folder");
}
void test() {
int err;
int lastctime;
struct stat s;
//
// chmod a file
//
// get the current ctime for the file
memset(&s, 0, sizeof s);
stat("file", &s);
lastctime = s.st_ctime;
sleep(1);
// do the actual chmod
err = chmod("file", 0200);
assert(!err);
memset(&s, 0, sizeof s);
stat("file", &s);
assert(s.st_mode == (0200 | S_IFREG));
assert(s.st_ctime != lastctime);
//
// fchmod a file
//
lastctime = s.st_ctime;
sleep(1);
err = fchmod(open("file", O_WRONLY), 0100);
assert(!err);
memset(&s, 0, sizeof s);
stat("file", &s);
assert(s.st_mode == (0100 | S_IFREG));
assert(s.st_ctime != lastctime);
//
// chmod a folder
//
// get the current ctime for the folder
memset(&s, 0, sizeof s);
stat("folder", &s);
lastctime = s.st_ctime;
sleep(1);
// do the actual chmod
err = chmod("folder", 0300);
assert(!err);
memset(&s, 0, sizeof s);
stat("folder", &s);
assert(s.st_mode == (0300 | S_IFDIR));
assert(s.st_ctime != lastctime);
//
// chmod a symlink's target
//
err = chmod("file-link", 0400);
assert(!err);
// make sure the file it references changed
stat("file-link", &s);
assert(s.st_mode == (0400 | S_IFREG));
// but the link didn't
lstat("file-link", &s);
assert(s.st_mode == (0777 | S_IFLNK));
//
// chmod the actual symlink
//
err = lchmod("file-link", 0500);
assert(!err);
// make sure the file it references didn't change
stat("file-link", &s);
assert(s.st_mode == (0400 | S_IFREG));
// but the link did
lstat("file-link", &s);
assert(s.st_mode == (0500 | S_IFLNK));
puts("success");
}
int main() {
atexit(cleanup);
signal(SIGABRT, cleanup);
setup();
test();
return EXIT_SUCCESS;
}
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