Removed submodules

lab4-ipc/main.c

@@ -0,0 +1,87 @@
+#include <assert.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+#include "pipe.h"
+
+int cmdline (int, char **, bool *, char **, char **, size_t *);
+
+void
+usage (void)
+{
+  printf ("Usage: ipc [options] EXEC ARG\n");
+  printf (" Send ARG through a pipe to child process that runs EXEC.\n");
+  printf (" Option is:\n");
+  printf ("  -s      Use posix_spawn() instead of fork() and exec().\n");
+}
+
+int
+main (int argc, char **argv)
+{
+  bool use_spawn = false;
+  char *exec = NULL;
+  char *fname = NULL;
+  size_t lineno = -1;
+
+  if (cmdline (argc, argv, &use_spawn, &exec, &fname, &lineno) < 0)
+    {
+      usage ();
+      return EXIT_FAILURE;
+    }
+
+  // Use fork/exec or spawn to run the executable exec
+  char *sum = NULL;
+  if (!use_spawn)
+    sum = get_result (exec, fname);
+  else
+    sum = spawn_result (exec, fname);
+
+  if (sum == NULL)
+    return EXIT_FAILURE;
+
+  printf ("%s(%s) = '%s'\n", exec, fname, sum);
+
+  // If you get an error here, it's because sum is not dynamically
+  // allocated correctly.
+  free (sum);
+  return EXIT_SUCCESS;
+}
+
+/* Helper for parsing the command line arguments. Sets spawn,
+   filename, and lineno as call-by-reference parameters. Return 0
+   on success, -1 otherwise. */
+int
+cmdline (int argc, char **argv, bool *spawn, char **exec, char **filename,
+         size_t *lineno)
+{
+  int option;
+
+  while ((option = getopt (argc, argv, "sh")) != -1)
+    {
+      switch (option)
+        {
+        case 's':
+          *spawn = true;
+          break;
+        case 'h':
+          return -1;
+          break;
+        default:
+          return -1;
+        }
+    }
+
+  if (optind + 2 != argc)
+    return -1;
+
+  *exec = argv[optind];
+  *filename = argv[optind + 1];
+
+  return 0;
+}