12.1 select调用

NaZixia · Feb 29, 2024 · 96a5e77 · 96a5e77
1 parent fce068c
commit 96a5e77
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diff --git a/12IO复用/1select调用事例/1select b/12IO复用/1select调用事例/1select
diff --git a/12IO复用/1select调用事例/1select.cpp b/12IO复用/1select调用事例/1select.cpp
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/select.h>
+#include <sys/time.h>
+
+#define BUF_SIZE 30
+
+int main(int argc,char *argv[])
+{
+ char buf[BUF_SIZE];
+ fd_set reads,temps;
+ int result,str_len;
+ struct timeval timeout;
+ FD_ZERO(&reads);
+ FD_SET(0,&reads);
+
+ while(1){
+ temps=reads;
+ timeout.tv_sec=5;
+ timeout.tv_usec=0;
+ result=select(1,&temps,0,0,&timeout);
+ if(result==-1){
+ fputs("error select\n",stdout);
+ break;
+ }
+ else if(result==0){
+ fputs("time out\n",stdout);
+ break;
+ }
+ else{ 
+ if(FD_ISSET(0,&temps)){
+ str_len=read(0,buf,BUF_SIZE);
+ buf[str_len]=0;
+ printf("message: %s",buf);
+ }
+ }
+ }
+
+ return 0;
+}
+
+