doc: make sample cross-platform build (#3592)

Co-authored-by: Ben Noordhuis <info@bnoordhuis.nl>

.github/workflows/CI-sample.yml

@@ -0,0 +1,32 @@
+name: ci-sample
+
+on:
+  pull_request:
+    paths:
+      - '**'
+      - '!docs/**'
+      - '!.**'
+      - '.github/workflows/CI-sample.yml'
+  push:
+    branches:
+      - v[0-9].*
+      - master
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
+    runs-on: ${{matrix.os}}
+    steps:
+      - uses: actions/checkout@v2
+      - name: setup
+        run: cmake -E make_directory ${{runner.workspace}}/libuv/docs/code/build
+      - name: configure
+        # you may like use Ninja on unix-like OS, but for windows, the only easy way is to use Visual Studio if you want Ninja
+        run: cmake ..
+        working-directory: ${{runner.workspace}}/libuv/docs/code/build
+      - name: build
+        run: cmake --build .
+        working-directory: ${{runner.workspace}}/libuv/docs/code/build

docs/code/CMakeLists.txt

@@ -0,0 +1,51 @@
+cmake_minimum_required(VERSION 3.5)
+
+project(libuv_sample)
+
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_subdirectory("../../" build)
+
+set(SIMPLE_SAMPLES
+        cgi
+        helloworld
+        dns
+        detach
+        default-loop
+        idle-basic
+        idle-compute
+        interfaces
+        locks
+        onchange
+        pipe-echo-server
+        ref-timer
+        spawn
+        tcp-echo-server
+        thread-create
+        udp-dhcp
+        uvcat
+        uvstop
+        uvtee
+        )
+IF (NOT WIN32)
+    list(APPEND SIMPLE_SAMPLES
+            signal
+            progress
+            queue-cancel
+            queue-work
+            tty
+            tty-gravity
+            )
+ENDIF()
+
+foreach (X IN LISTS SIMPLE_SAMPLES)
+    add_executable(${X} ${X}/main.c)
+    target_link_libraries(${X} uv_a)
+endforeach ()
+
+
+FIND_PACKAGE(CURL)
+IF(CURL_FOUND)
+    add_executable(uvwget uvwget/main.c)
+    target_link_libraries(uvwget uv_a ${CURL_LIBRARIES})
+ENDIF(CURL_FOUND)

docs/code/cgi/main.c

@@ -15,8 +15,8 @@ void cleanup_handles(uv_process_t *req, int64_t exit_status, int term_signal) {
 }
 
 void invoke_cgi_script(uv_tcp_t *client) {
-    size_t size = 500;
-    char path[size];
+    char path[500];
+    size_t size = sizeof(path);
     uv_exepath(path, &size);
     strcpy(path + (strlen(path) - strlen("cgi")), "tick");
 

docs/code/interfaces/main.c

@@ -11,17 +11,17 @@ int main() {
 
     printf("Number of interfaces: %d\n", count);
     while (i--) {
-        uv_interface_address_t interface = info[i];
+        uv_interface_address_t interface_a = info[i];
 
-        printf("Name: %s\n", interface.name);
-        printf("Internal? %s\n", interface.is_internal ? "Yes" : "No");
+        printf("Name: %s\n", interface_a.name);
+        printf("Internal? %s\n", interface_a.is_internal ? "Yes" : "No");
         
-        if (interface.address.address4.sin_family == AF_INET) {
-            uv_ip4_name(&interface.address.address4, buf, sizeof(buf));
+        if (interface_a.address.address4.sin_family == AF_INET) {
+            uv_ip4_name(&interface_a.address.address4, buf, sizeof(buf));
             printf("IPv4 address: %s\n", buf);
         }
-        else if (interface.address.address4.sin_family == AF_INET6) {
-            uv_ip6_name(&interface.address.address6, buf, sizeof(buf));
+        else if (interface_a.address.address4.sin_family == AF_INET6) {
+            uv_ip6_name(&interface_a.address.address6, buf, sizeof(buf));
             printf("IPv6 address: %s\n", buf);
         }
 

docs/code/thread-create/main.c

@@ -1,5 +1,4 @@
 #include <stdio.h>
-#include <unistd.h>
 
 #include <uv.h>
 
@@ -7,7 +6,7 @@ void hare(void *arg) {
     int tracklen = *((int *) arg);
     while (tracklen) {
         tracklen--;
-        sleep(1);
+        uv_sleep(1000);
         fprintf(stderr, "Hare ran another step\n");
     }
     fprintf(stderr, "Hare done running!\n");
@@ -18,7 +17,7 @@ void tortoise(void *arg) {
     while (tracklen) {
         tracklen--;
         fprintf(stderr, "Tortoise ran another step\n");
-        sleep(3);
+        uv_sleep(3000);
     }
     fprintf(stderr, "Tortoise done running!\n");
 }

docs/code/udp-dhcp/main.c

@@ -53,7 +53,8 @@ uv_buf_t make_discover_msg() {
     // HOPS
     buffer.base[3] = 0x0;
     // XID 4 bytes
-    buffer.base[4] = (unsigned int) random();
+    if (uv_random(NULL, NULL, &buffer.base[4], 4, 0, NULL))
+      abort();
     // SECS
     buffer.base[8] = 0x0;
     // FLAGS

docs/code/uvcat/main.c

@@ -1,7 +1,6 @@
 #include <assert.h>
 #include <stdio.h>
 #include <fcntl.h>
-#include <unistd.h>
 #include <uv.h>
 
 void on_read(uv_fs_t *req);

docs/code/uvtee/main.c

@@ -1,6 +1,5 @@
 #include <stdio.h>
 #include <fcntl.h>
-#include <unistd.h>
 #include <string.h>
 #include <stdlib.h>