Character driver finished

select_poll/multi1.c

@@ -18,5 +18,8 @@ int main(){
     n = read( fd2, buf, 10);
 
     printf(" read data = %s from ptwo \n", buf);
+
+    close(fd1);
+    close(fd2);
     return 0;
 }

select_poll/multi2.c

@@ -20,7 +20,7 @@ int main(){
     FD_ZERO(&read_set);
     FD_SET(fd1, &read_set);
     FD_SET(fd2, &read_set);
-
+ 
     n = select(FD_SETSIZE, &read_set, NULL, NULL, &timeout);
     if( n < 0 ){
         perror("select ");
@@ -40,6 +40,9 @@ int main(){
         n = read(fd2, buf, 10);
         printf(" read data = %s from ptwo \n", buf);
     }
+
+    // close(fd1);
+    // close(fd2);
     
     return 0;
 

select_poll/poll1.c

@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <poll.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <stdlib.h>
+
+int main(){
+    int fd1, fd2;
+    struct pollfd pollarray[10];
+    char buf[10];
+    int n;
+    
+    fd1 = open("./pone", O_RDWR);
+    fd2 = open("./ptwo", O_RDWR);
+    pollarray[0].fd = fd1;
+    pollarray[1].fd = fd2;
+    pollarray[0].events = POLLIN;
+    pollarray[1].events = POLLIN;
+
+    n = poll(pollarray, 2, 10000);
+    if(n < 0){
+        perror("poll:");
+        exit(1);
+    }
+
+    //test whether fd1 is ready or not
+    if( (pollarray[0].revents & POLLIN)){
+        printf(" reading from fd1 (pone)\n");
+        n = read(fd1, buf, 10);
+        printf(" read data = %s from pone\n", buf);
+    }
+
+
+    //test whether fd2 is ready or not
+    if( (pollarray[1].revents & POLLIN)){
+        printf(" reading from fd2 (ptwo)\n");
+        n = read(fd2, buf, 10);
+        printf(" read data = %s from ptwo\n", buf);
+    }
+
+    // close(fd1);
+    // close(fd2);
+    return 0;
+}