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#include <cerrno>
#include <cstring>
#include <iostream>
#include <string>
#include <sstream>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
using std::endl;
//============================================================================
// :: Helpers
namespace
{
//--------------------------------------------------------------------------
// Helper to create an empty file with the given path.
void touch(const std::string& path, const mode_t mode)
{
std::cout
<< "Touching file: " << path << " with mode=" << std::oct << mode
<< std::dec << endl;
const int fd = ::open(path.c_str(), O_CREAT | O_WRONLY, mode);
if (fd == -1) {
const int error = errno;
std::cout
<< "Failed to touch file using open: " << path << "; errno=" << error
<< ";" << std::strerror(error) << endl;
}
else {
::close(fd);
}
}
//--------------------------------------------------------------------------
// Stats the given path and prints the mode. Returns true if the path
// exists; false otherwise.
bool exists(const std::string& path)
{
struct ::stat path_stat;
if (::lstat(path.c_str(), &path_stat) != 0) {
const int error = errno;
if (error == ENOENT) {
// Only bother logging if something other than the path not existing
// went wrong.
std::cout
<< "Failed to lstat path: " << path << "; errno=" << error << "; "
<< std::strerror(error) << endl;
}
return false;
}
std::cout
<< std::oct << "Mode for path=" << path << ": " << path_stat.st_mode
<< std::dec << endl;
return true;
}
}
//============================================================================
// :: Entry Point
int main()
{
touch("file1", 0667);
if (not exists("file1")) {
std::cout << "Failed to create path: file1" << endl;
return 1;
}
if (exists("file1/dir")) {
std::cout << "Path should not exists: file1/dir" << endl;
return 1;
}
touch("file2", 0676);
if (not exists("file2")) {
std::cout << "Failed to create path: file2" << endl;
return 1;
}
if (exists("file2/dir")) {
std::cout << "Path should not exists: file2/dir" << endl;
return 1;
}
touch("file3", 0766);
if (not exists("file3")) {
std::cout << "Failed to create path: file3" << endl;
return 1;
}
if (exists("file3/dir")) {
std::cout << "Path should not exists: file3/dir" << endl;
return 1;
}
std::cout << "ok." << endl;
return 0;
}
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