that damn stat()

This is a discussion on that damn stat() within the Linux Programming forums, part of the Platform Specific Boards category; Ok my program works, only problem is i am unsure of the stat command say from the linux terminal stat ...

  1. #1
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    that damn stat()

    Ok my program works, only problem is i am unsure of the stat command

    say from the linux terminal
    stat -l txtfile

    it would display lots of info about that file, such as its permissions something like -rw-r--r--

    How can you do this with the stat function, i think its something to do with either .st_mode or st_dev
    does anyone know, i searched the net and can't find anything, other than the same repeted cat description from linux. can anyone help me its doing my head.

    Code:
    #include <stdio.h>
    #include <string.h>
    #include <time.h>
    #include <unistd.h>
    #include <sys/stat.h>
    #include <sys/types.h>
    
    #define BUFFER 30
    
    int status;
    
    struct stat statinfo;
    
    int main ( ) {
        char buff[BUFFER];
    		printf("Enter a Filename\n");
        while ( fgets(buff,BUFFER,stdin) != NULL ) 
    		{
          char *nl = strchr( buff, '\n' );
          
          if ( buff[0] == '\n' ) 
    			  break;   /* blank line entered */
            
    			if ( nl != NULL ) 
    			  *nl = '\0';   /* remove the end of line */
          
    			status = stat( buff, &statinfo );
            
    			if ( status == 0 )
    			{
    			  printf("File: '%s' \n", buff);
    				printf("Size: %d bytes\n", statinfo.st_size);
    				printf("%o\n", statinfo.st_dev)ge;
    				printf("System Permission: %m\n", statinfo.st_mode);
    				printf("Inode:%d  Links %d\n",statinfo.st_ino,statinfo.st_nlink);
    					
    	 			printf("User ID %u\n", statinfo.st_uid);
    				printf("Group ID %u\n", statinfo.st_gid);
    				printf("Last Accessed %s",ctime(&statinfo.st_atime));
    				printf("Last changed %s", ctime(&statinfo.st_ctime));
    				printf("Last Modified: %s", ctime(&statinfo.st_mtime));
    			}
    			else 
            perror( "Failed to stat" );
    		
    		  printf("Enter a Filename\n");			        
        }
    		printf("Program terminated\n");
        return 0;
    }

  2. #2
    and the hat of wrongness Salem's Avatar
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    > printf("System Permission: %m\n", statinfo.st_mode);
    There's no such thing as %m.
    If you want to print the mode, then you need to do it on a per bit basis.

    st_mode is a series of bits which are set or clear depending on whether that particular permission is allowed.

    eg
    Code:
    if ( statinfo.st_mode & S_IRUSR ) putchar('r'); else putchar('-');
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  3. #3
    Blank
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    Try reading man 2 stat to get all the defines

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