Time system call help xv6.

time.c

#include "types.h" #include "user.h" #include "date.h"

int main (int argc, char *argv[]) { int startTicks = uptime();

int pid = fork(); if (pid < 0) { printf(2, "Error: Invalid PID! "); exit(); } if (pid > 0) wait(); if (pid == 0) { if (exec(argv[1], argv + 1) < 0) { printf(2, "Error: Exec fails! "); exit(); } }

int endTicks = uptime();

int seconds = (endTicks - startTicks); printf(1, " Real Time in ticks: %d tick(s) ", seconds); exit(); }

1. If command is time ls, it should display in number of ticks 2. If command is time ls -s, it should display time in seconds (floating point value).

Just need help modifying this code to fit the requirments of the second inputoption. "time ls -s"