Do there have an Xlib API to get the current application directionary path?

mirsoft · 03-11-2008, 08:17 PM

like the title, any one can help me ?
3Q

paulsm4 · 03-11-2008, 08:49 PM

No - there is no Xlib API...
... but argv[0] should give you what you're looking for.

mirsoft · 03-11-2008, 08:58 PM

thanks, do c runtime lib have this api to do this. if have , could you give me a simple.

paulsm4 · 03-12-2008, 12:44 AM

Sure -

Code:

#include <stdio.h>
#include <unistd.h>

int
main (int argc, char *argv[])
{
  char buffer[80];
  printf ("argv[0]: %s...\n", argv[0]);
  printf ("getcwd (): %s...\n", getcwd (buffer, sizeof (buffer)));
  return 0;
}

Quote:

$ gcc -o hello hello.c
$ `pwd`/hello
argv[0]: /home/paulsm/hello...
getcwd (): /home/paulsm...

osor · 03-13-2008, 12:51 PM

But there is no portable way of finding a process’s actual path (paulsm4 forces the issue by calling the process a certain way). In particular, a process might not even have a path any more.

If you’re on linux, there is a non-portable, somewhat reliable method of finding this out (it uses the /proc filesystem):

Code:

#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main()
{
	char proc_path[20];
	char path[PATH_MAX];
	int i;

	sprintf(proc_path, "/proc/%d/exe", getpid());
	if((i = readlink(proc_path, path, PATH_MAX-1)) == -1)
		exit(EXIT_FAILURE);	
	path[i] = 0;

	printf("process path is \"%s\".\n", path);

	return 0;
}