Hey List,
I've been playing with stat() and lstat() in the past few days and
things seem to be weird.
I made two test programs to demonstrate the problem. The first is
written in C and behaves correctly, the second is written in C# and is
quite abnormal. I attached both of them.
Let's see the test results on a socket file:
$ stattest-c /home/laci/.gnome-system-monitor.laci
filename: /home/laci/.gnome-system-monitor.laci
stat
is_file: false
is_dir: false
is_fifo: false
is_sock: true
is_chardev: false
is_blockdev: false
lstat
is_file: false
is_dir: false
is_fifo: false
is_sock: true
is_chardev: false
is_blockdev: false
$ mono StatTest.exe /home/laci/.gnome-system-monitor.laci
filename: /home/laci/.gnome-system-monitor.laci
stat
is_file: true
is_dir: true
is_fifo: false
is_sock: true
is_chardev: false
is_blockdev: false
lstat
is_file: true
is_dir: true
is_fifo: false
is_sock: true
is_chardev: false
is_blockdev: false
Somebody could explain what's wrong with
Mono.Unix.Native.Syscall.(l)stat?
Thanks in advance!
--
Laci
Blog: http://monda.hu/~laci/blog
Home: http://mondalaci.objectis.net
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
void dostat(mode_t mode)
{
printf("\tis_file: %s\n", S_ISREG(mode) ? "true" : "false");
printf("\tis_dir: %s\n", S_ISDIR(mode) ? "true" : "false");
printf("\tis_fifo: %s\n", S_ISFIFO(mode) ? "true" : "false");
printf("\tis_sock: %s\n", S_ISSOCK(mode) ? "true" : "false");
printf("\tis_chardev: %s\n", S_ISCHR(mode) ? "true" : "false");
printf("\tis_blockdev: %s\n\n", S_ISBLK(mode) ? "true" : "false");
}
int main(int argc, char *argv[])
{
if (argc == 1) {
printf("You should provide a filename to stat.\n");
exit(1);
}
char *filename = argv[1];
struct stat *st = (struct stat*)malloc(sizeof(stat));
mode_t mode;
printf("filename: %s\n\n", filename);
printf("stat\n");
stat(filename, st);
mode = st->st_mode;
dostat(mode);
printf("lstat\n");
lstat(filename, st);
mode = st->st_mode;
dostat(mode);
}
using System;
using MUN = Mono.Unix.Native;
public class StatText {
public static void Main(string[] argv)
{
if (argv.Length == 0) {
Console.WriteLine("You need to provide to filename to stat.");
System.Environment.Exit(1);
}
string filename = argv[0];
MUN.Stat stat;
Console.WriteLine("filename: {0}\n", filename);
Console.WriteLine("stat");
MUN.Syscall.stat(filename, out stat);
dostat(stat);
Console.WriteLine("lstat");
MUN.Syscall.lstat(filename, out stat);
dostat(stat);
}
static void dostat(MUN.Stat stat)
{
bool is_file = (stat.st_mode & MUN.FilePermissions.S_IFREG) == MUN.FilePermissions.S_IFREG;
bool is_dir = (stat.st_mode & MUN.FilePermissions.S_IFDIR) == MUN.FilePermissions.S_IFDIR;
bool is_fifo = (stat.st_mode & MUN.FilePermissions.S_IFIFO) == MUN.FilePermissions.S_IFIFO;
bool is_sock = (stat.st_mode & MUN.FilePermissions.S_IFSOCK) == MUN.FilePermissions.S_IFSOCK;
bool is_chardev = (stat.st_mode & MUN.FilePermissions.S_IFCHR) == MUN.FilePermissions.S_IFCHR;
bool is_blockdev = (stat.st_mode & MUN.FilePermissions.S_IFBLK) == MUN.FilePermissions.S_IFBLK;
Console.WriteLine("\tis_file: {0}", is_file ? "true" : "false");
Console.WriteLine("\tis_dir: {0}", is_dir ? "true" : "false");
Console.WriteLine("\tis_fifo: {0}", is_fifo ? "true" : "false");
Console.WriteLine("\tis_sock: {0}", is_sock ? "true" : "false");
Console.WriteLine("\tis_chardev: {0}", is_chardev ? "true" : "false");
Console.WriteLine("\tis_blockdev: {0}\n", is_blockdev ? "true" : "false");
}
}
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