关于select函数，哪位高手帮我看看下面这个系统调用的程序那里有问题，帮我修改一下，谢谢。__mplex_error_include_function_undeclared_

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关于select函数，哪位高手帮我看看下面这个系统调用的程序那里有问题，帮我修改一下，谢谢。

来源: 互联网发布时间：2016-10-29

本文导语: [root@localhost mplex]# make gcc -o mplex mplex.c mplex.c:39:26: error: macro "FD_ISSET" requires 2 arguments, but only 1 given mplex.c: In function ‘main’: mplex.c:39: error: ‘FD_ISSET’ undeclared (first use in this function) mplex.c:39: error: (Ea...

[root@localhost mplex]# make
gcc -o mplex mplex.c
mplex.c:39:26: error: macro "FD_ISSET" requires 2 arguments, but only 1 given
mplex.c: In function ‘main’:
mplex.c:39: error: ‘FD_ISSET’ undeclared (first use in this function)
mplex.c:39: error: (Each undeclared identifier is reported only once
mplex.c:39: error: for each function it appears in.)
mplex.c:39: error: expected expression before ‘||’ token
mplex.c:39: error: expected statement before ‘)’ token

#include
#include
#include
#include

#define BUFSZ 80

void err_quit(char *msg);

int main()
{
int fds[2];
char buf[BUFSZ];
int i,rc,maxfd;
fd_set watchset; //read this set of file descriptors;
fd_set inset; // copy of watchset for select to update

//open the pipes
if((fds[0] = open("pipe1",O_RDONLY | O_NONBLOCK))