1    	#include "mtcp_internal.h"
2    	
3    	/**
4    	 * This function behaves exactly like mtcp_sys_open(), except that you are
5    	 * guaranteed to receive a file descriptor that is not one of the standard 3.
6    	 * This is useful if, for instance, you have no fd 0, receive one through
7    	 * open(), dup2 it to stdin, and close the original (therefore closing stdin).
8    	 *
9    	 * @param filename the file to open
10   	 * @param flags the flags that indicate how to open it
11   	 * @param mode if O_CREAT is in flags and the file gets created, mode indicates
12   	 * the permissions
13   	 *
14   	 * @return a file descriptor to filename, opened according to flags and mode,
15   	 * that is guaranteed to not be one of the standard 3
16   	 */
17   	int mtcp_safe_open(char const *filename, int flags, mode_t mode)
18   	{
19   	    int fds[3];
20   	    int i, j, fd;
21
At conditional (1): "i < 4": Taking true branch.
At conditional (7): "i < 4": Taking true branch.
At conditional (13): "i < 4": Taking true branch. 
22   	    for(i = 0; i < 4; i++)
23   	    {
At conditional (2): "(unsigned long)resultvar >= 18446744073709547521UL": Taking false branch.
At conditional (3): "(unsigned long)resultvar >= 18446744073709547521UL": Taking false branch.
At conditional (8): "(unsigned long)resultvar >= 18446744073709547521UL": Taking false branch.
At conditional (9): "(unsigned long)resultvar >= 18446744073709547521UL": Taking false branch.
At conditional (14): "(unsigned long)resultvar >= 18446744073709547521UL": Taking false branch.
At conditional (15): "(unsigned long)resultvar >= 18446744073709547521UL": Taking false branch. 
24   	        fd = mtcp_sys_open(filename, flags, mode);
25
At conditional (4): "fd != 0": Taking true branch.
At conditional (5): "fd != 1": Taking true branch.
At conditional (6): "fd != 2": Taking false branch.
At conditional (10): "fd != 0": Taking true branch.
At conditional (11): "fd != 1": Taking true branch.
At conditional (12): "fd != 2": Taking false branch.
At conditional (16): "fd != 0": Taking true branch.
At conditional (17): "fd != 1": Taking true branch.
At conditional (18): "fd != 2": Taking false branch. 
26   	        if((fd != STDIN_FILENO) &&
27   	           (fd != STDOUT_FILENO) &&
28   	           (fd != STDERR_FILENO))
29   	            break;
30
Event overrun-local: Overrunning static array "fds", with 3 elements, at position 3 with index variable "i". 
31   	        fds[i] = fd;
32   	    }
33   	
34   	    for(j = 0; j < i; j++)
35   	        mtcp_sys_close(fds[j]);
36   	
37   	    return fd;
38   	}