add directory study

2024-02-19 00:25:23 -05:00
parent b1306b38b1
commit f3774e2f8c
4001 changed files with 2285787 additions and 0 deletions
--- a/study/linux-travel/MINIX-1.5/1.5/Source/commands/time.c
+++ b/study/linux-travel/MINIX-1.5/1.5/Source/commands/time.c
@@ -0,0 +1,119 @@
+/* time - time a command	Authors: Andy Tanenbaum & Michiel Huisjes */
+
+#include <sys/types.h>
+#include <sys/times.h>
+#include <limits.h>
+#include <time.h>
+#include <signal.h>
+
+#define HZ CLOCKS_PER_SEC
+
+char **args;
+char *name;
+
+int digit_seen;
+char a[] = "        .  \n";
+
+main(argc, argv)
+int argc;
+char *argv[];
+{
+
+  struct tms pre_buf, post_buf;
+  int status, pid;
+  long start_time, end_time;
+
+  if (argc == 1) exit(0);
+
+  args = &argv[1];
+  name = argv[1];
+
+  /* Get real time at start of run. */
+  (void) time(&start_time);
+
+  /* Fork off child. */
+  if ((pid = fork()) < 0) {
+	std_err("Cannot fork\n");
+	exit(1);
+  }
+  if (pid == 0) execute();
+
+  /* Parent is the time program.  Disable interrupts and wait. */
+  signal(SIGINT, SIG_IGN);
+  signal(SIGQUIT, SIG_IGN);
+
+  do {
+	times(&pre_buf);
+  } while (wait(&status) != pid);
+  (void) time(&end_time);
+
+  if ((status & 0377) != 0) std_err("Command terminated abnormally.\n");
+  times(&post_buf);
+
+  /* Print results. */
+  print_time("real ", (end_time - start_time) * HZ);
+  print_time("user ", post_buf.tms_cutime - pre_buf.tms_cutime);
+  print_time("sys  ", post_buf.tms_cstime - pre_buf.tms_cstime);
+  exit(status >> 8);
+}
+
+print_time(mess, t)
+char *mess;
+register long t;
+{
+/* Print the time 't' in hours: minutes: seconds.  't' is in ticks. */
+  int hours, minutes, seconds, hundredths, i;
+
+  digit_seen = 0;
+  for (i = 0; i < 8; i++) a[i] = ' ';
+  hours = (int) (t / (3600L * (long) HZ));
+  t -= (long) hours * 3600L * (long) HZ;
+  minutes = (int) (t / (60L * (long) HZ));
+  t -= (long) minutes * 60L * (long) HZ;
+  seconds = (int) (t / (long) HZ);
+  t -= (long) seconds * (long) HZ;
+  hundredths = (int) (t * 100L / (long) HZ);
+
+  std_err(mess);
+
+  if (hours) {
+	twin(hours, &a[0]);
+	a[2] = ':';
+  }
+  if (minutes || digit_seen) {
+	twin(minutes, &a[3]);
+	a[5] = ':';
+  }
+  if (seconds || digit_seen)
+	twin(seconds, &a[6]);
+  else
+	a[7] = '0';
+  a[9] = hundredths / 10 + '0';
+  a[10] = hundredths % 10 + '0';
+#ifndef HUNDREDTHS		/* tenths used to be enough */
+  a[10] = '\n'; a[11] = 0;
+#endif
+  std_err(a);
+}
+
+twin(n, p)
+int n;
+char *p;
+{
+  char c1, c2;
+  c1 = (n / 10) + '0';
+  c2 = (n % 10) + '0';
+  if (digit_seen == 0 && c1 == '0') c1 = ' ';
+  *p++ = c1;
+  *p++ = c2;
+  if (n > 0) digit_seen = 1;
+}
+
+execute()
+{
+  execvp(name, args);
+  std_err("Cannot execute ");
+  std_err(name);
+  std_err("\n");
+  exit(-1);
+}