1 files changed, 52 insertions, 0 deletions
diff --git a/reference/C/CONTRIB/OR_USING_C/09.2.c b/reference/C/CONTRIB/OR_USING_C/09.2.c
new file mode 100644
index 0000000..82ad2bb
--- /dev/null
+++ b/reference/C/CONTRIB/OR_USING_C/09.2.c
@@ -0,0 +1,52 @@
+execute(args, sin, sout, serr)
+char **args;
+int sin, sout, serr;
+{
+    int pid, status;
+
+    /*
+     * Get a child process.
+     */
+    if ((pid = fork()) < 0) {
+        perror("fork");
+        exit(1);
+    }
+
+    /*
+     * The child executes the code inside the if.
+     */
+    if (pid == 0) {
+        /*
+         * For each of standard input, output,
+         * and error output, set the child's
+         * to the passed-down file descriptor.
+         * Note that we can't just close 0, 1,
+         * and 2 since we might need them.
+         */
+        if (sin != 0) {
+            close(0);
+            dup(sin);    /* will give us fd #0 */
+        }
+
+        if (sout != 1) {
+            close(1);
+            dup(sout);    /* will give us fd #1 */
+        }
+
+        if (serr != 2) {
+            close(2);
+            dup(serr);    /* will give us fd #2 */
+        }
+
+        execvp(*args, args);
+        perror(*args);
+        exit(1);
+    }
+
+    /*
+     * The parent executes the wait.
+     */
+    while (wait(&status) != pid)
+        /* empty loop */;
+}
+