From ba711deb0de9caf64e625a5da9130be0a3967266 Mon Sep 17 00:00:00 2001
From: Jeremy Soller <jeremy@system76.com>
Date: Sun, 28 Apr 2019 09:27:07 -0600
Subject: [PATCH] Convert select example to use pipes

---
 tests/select.c | 30 ++++++++++++++++++++++++------
 1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/tests/select.c b/tests/select.c
index a367b4ce16..25326a7512 100644
--- a/tests/select.c
+++ b/tests/select.c
@@ -6,19 +6,37 @@
 #include "test_helpers.h"
 
 int main(void) {
-    int fd = open("select.c", 0, 0);
+    int pipefd[2];
+    if (pipe2(pipefd, O_NONBLOCK) < 0) {
+        perror("pipe");
+        return 1;
+    }
+
+    char c = 'c';
+    if (write(pipefd[1], &c, sizeof(c)) < 0) {
+        perror("write");
+        return 1;
+    }
 
     fd_set read;
     FD_ZERO(&read);
-    FD_SET(fd, &read);
+    FD_SET(pipefd[0], &read);
 
-    printf("Is set before? %d\n", FD_ISSET(fd, &read));
+    printf("Is set before? %d\n", FD_ISSET(pipefd[0], &read));
 
     // This should actually test TCP streams and stuff, but for now I'm simply
     // testing whether it ever returns or not.
-    printf("Amount of things ready: %d\n", select(fd + 1, &read, NULL, NULL, NULL));
+    int nfds = select(pipefd[0] + 1, &read, NULL, NULL, NULL);
+    if (nfds < 0) {
+        perror("select");
+        return 1;
+    }
+    printf("Amount of things ready: %d\n", nfds);
 
-    printf("Is set after? %d\n", FD_ISSET(fd, &read));
+    printf("Is set after? %d\n", FD_ISSET(pipefd[0], &read));
 
-    close(fd);
+    close(pipefd[0]);
+    close(pipefd[1]);
+
+    return 0;
 }