CS 456 - Systems Programming Spring 2024

Displaying ./code/feb08/exec2.c

#include <unistd.h>
#include <fcntl.h> // O_CREAT, O_APPEND etc. defined here
#include <stdio.h>

int main() {
   
   close(1); // close standard out
   
   open("log.txt", O_RDWR | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR);
   puts("Captain's log");
   
   chdir("..");
   // execl( executable,  arguments for executable including program name and NULL at the end)

   execl("/bin/ls", /* Remaining items sent to ls*/ "/bin/ls", ".", (char *) NULL); // "ls ."
   
   perror("exec failed");
   
   return 0; // Not expected
}