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executable file

Posted on 1998-11-05
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Last Modified: 2010-04-15
In a C program, How it is possible to know that a particular file is executable?
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Question by:navin_agrawal
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by:MatthewL
ID: 1254063
Are you just interested in the actual file name or the file structure?

if filename then you could use command line arguments since the first argument is the filename.  Then you could use strtok or strstr to point to the "." and pull in the extension.

if structure, then my reference says that the first word of an executable file should be EXE program identifier.  It lists this value as being 5A4DH.  It's not clear to me if this is a sample value or always the case.

Matt
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by:rbr
ID: 1254064
It depends on your OS. Which OS do you use?
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by:siabod
ID: 1254065
That's always the case for a EXE
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Author Comment

by:navin_agrawal
ID: 1254066
Let me be specific in telling the things. Following assumptions are made:

OS: Unix
File Name: /usr/home/stc/friend
Language: C

main ()
{
      char file_name[][] = "/usr/home/stc/friend"

      Here I want to know whether the file in file_name variable is executable or not. How to do this?
} /* end of mail () */
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by:braveheart
ID: 1254067
You'll have more luck posting in the UNIX Programming topic area.
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Accepted Solution

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rbr earned 100 total points
ID: 1254068
#include <sys/stat.h>
#include <unistd.h>
main ()
{
char file_name[]="/usr/home/stc/friend"

struct stat stat_buf;

stat (file_name,&stat_buf);

if (stat_buf.st_mode & S_IXUSR)
printf ("Execute by user");
if (stat_buf.st_mode & S_IXGRP)
printf ("Execute by group");
if (stat_buf.st_mode & S_IXOTH)
printf ("Execute by others");
}

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