Assume that invisible _file is NOT in the current directory where you execute the following code, so it

will give you the error using

perror

function. The purpose of this lab is to help you understand

perror.

--perror_file.c-------------------------

#include

#include // for exit() function

#include

#include

#include

int main(int argc, char *argv[])

{

int fd;

if ( argc < 2 ){

printf("Usage: %s \ n", argv[0]);

printf("The file might exist or not.\ n");

exit(1);

}

fd = open(argv[1], O_RDONLY);

// printf will output user's formatted string, while perror will output

// the system error msg corresponding to errno

if (fd == -1){

printf("Opening file \ "%s\ " failed.\ n", argv[1]);

}

else{

printf("The file \ "%s\ " was opened w/o problem.\ n", argv[1]);

}

return 0;

}

Modify the code so that it will try to change to a directory rather than access a file. What error did you get?

Use perror appropriately in the code to show the error.