48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/*
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* Test out reading with poll()
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* This should run with any Unix
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*
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* Copyright (C) 2003 Alessandro Rubini and Jonathan Corbet
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* Copyright (C) 2003 O'Reilly & Associates
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*
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* The source code in this file can be freely used, adapted,
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* and redistributed in source or binary form, so long as an
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* acknowledgment appears in derived source files. The citation
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* should list that the code comes from the book "Linux Device
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* Drivers" by Alessandro Rubini and Jonathan Corbet, published
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* by O'Reilly & Associates. No warranty is attached;
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* we cannot take responsibility for errors or fitness for use.
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*
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* $Id: polltest.c,v 1.1 2003/02/07 18:01:38 corbet Exp $
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/poll.h>
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#include <fcntl.h>
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char buffer[4096];
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int main(int argc, char **argv)
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{
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struct pollfd pfd;
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int n;
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fcntl(0, F_SETFL, fcntl(0,F_GETFL) | O_NONBLOCK); /* stdin */
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pfd.fd = 0; /* stdin */
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pfd.events = POLLIN;
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while (1) {
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n=read(0, buffer, 4096);
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if (n >= 0)
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write(1, buffer, n);
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n = poll(&pfd, 1, -1);
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if (n < 0)
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break;
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}
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perror( n<0 ? "stdin" : "stdout");
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exit(1);
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}
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