demo

fsnotify-demo/demo/demo.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"context"
+	"log"
+	"os"
+	"os/signal"
+
+	"github.com/fsnotify/fsnotify"
+)
+
+func main() {
+	watcher, err := fsnotify.NewWatcher()
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer watcher.Close()
+
+	ctx, cancel := context.WithCancel(context.Background())
+
+	go func() {
+		for {
+			select {
+			case event, ok := <-watcher.Events:
+				if !ok {
+					return
+				}
+
+				log.Println("event:", event)
+				if event.Has(fsnotify.Create) {
+					log.Println("created file:", event.Name)
+				}
+			case err, ok := <-watcher.Errors:
+				if !ok {
+					return
+				}
+				log.Println("error:", err)
+			case <-ctx.Done():
+				return
+			}
+		}
+	}()
+
+	if err = watcher.Add("/home/yono/watchdir"); err != nil {
+		log.Fatal(err)
+	}
+
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, os.Interrupt)
+
+	<-c
+
+	cancel()
+}

fsnotify-demo/go.mod

@@ -0,0 +1,7 @@
+module fsnotify-demo
+
+go 1.22.4
+
+require github.com/fsnotify/fsnotify v1.7.0
+
+require golang.org/x/sys v0.4.0 // indirect

fsnotify-demo/go.sum

@@ -0,0 +1,4 @@
+github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
+github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
+golang.org/x/sys v0.4.0 h1:Zr2JFtRQNX3BCZ8YtxRE9hNJYC8J6I1MVbMg6owUp18=
+golang.org/x/sys v0.4.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

inotify/demo.c

@@ -0,0 +1,99 @@
+// build command: gcc demo.c -o demo
+
+#define _POSIX_SOURCE 0
+
+#include <stdio.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/inotify.h>
+
+extern int errno;
+int fd;
+
+void handler(int signo, siginfo_t *info, void *context) {
+    printf("interrupted\n");
+    close(fd);
+    exit(EXIT_SUCCESS);
+}
+
+void print_event_name(struct inotify_event *event) {
+    if (event->len > 0) {
+        printf("event on %s\n", event->name);
+    } else {
+        printf("\n");
+    }
+}
+
+int main(int argc, char *argv[]) {
+    errno = 0;
+
+    struct sigaction act = { 0 };
+    act.sa_flags = SA_SIGINFO;
+    act.sa_sigaction = &handler;
+
+    if (sigaction(SIGINT, &act, NULL) == -1) {
+        perror("sigaction");
+        return(EXIT_FAILURE);
+    }
+
+    fd = inotify_init();
+    if (fd == -1) {
+        perror("inotify_init");
+        return(EXIT_FAILURE);
+    }
+
+    int wd = inotify_add_watch(fd, "/home/yono/watchdir", IN_OPEN|IN_CLOSE|IN_DELETE);
+    if (wd == -1) {
+        perror("inotify_add_watch");
+        close(fd);
+        return(EXIT_FAILURE);
+    }
+
+    struct inotify_event *event;
+    uint8_t buf[1024];
+    ssize_t len;
+    uint32_t start = 0;
+    while (1) {
+        len = read(fd, buf + start, 1024);
+        if (len == -1) {
+            perror("read");
+            close(fd);
+            return(EXIT_FAILURE);
+        }
+
+        while(len >= 0x10) {
+            event = (struct inotify_event *)buf;
+            switch(event->mask) {
+                case IN_OPEN:
+                    printf("open: ");
+                    print_event_name(event);
+                    break;
+                case IN_CLOSE_WRITE:
+                case IN_CLOSE_NOWRITE:
+                    printf("close: ");
+                    print_event_name(event);
+                    break;
+                case IN_DELETE:
+                    printf("delete: ");
+                    print_event_name(event);
+                    break;
+            }
+
+            if (0x10 + event->len <= len) {
+                uint32_t evlen = event->len;
+                memcpy(buf, buf + 0x10 + evlen, len - 0x10 - evlen);
+
+                len = len - 0x10 - evlen;
+            }
+        }
+        start = len;
+    }
+    
+
+    close(fd);
+    printf("hello world\n");
+    return(0);
+}