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March 21, 2020 09:41
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poll example
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#include <stdio.h> | |
#include <unistd.h> | |
#include <poll.h> | |
#define TIMEOUT 5 /* poll timeout, in seconds */ | |
int main (void) { | |
struct pollfd fds[2]; | |
int ret; | |
/* watch stdin for input */ | |
fds[0].fd = STDIN_FILENO; | |
fds[0].events = POLLIN; | |
/* watch stdout for ability to write (almost always true) */ | |
fds[1].fd = STDOUT_FILENO; | |
fds[1].events = POLLOUT; | |
/* All set, block! */ | |
ret = poll (fds, 2, TIMEOUT * 1000); | |
if (ret == −1) { | |
perror ("poll"); | |
return 1; | |
} | |
if (!ret) { | |
printf ("%d seconds elapsed.\n", TIMEOUT); | |
return 0; | |
} | |
if (fds[0].revents & POLLIN) | |
printf ("stdin is readable\n"); | |
if (fds[1].revents & POLLOUT) | |
printf ("stdout is writable\n"); | |
return 0; | |
} | |
/* | |
$ ./poll | |
stdout is writable | |
$ ./poll < some_file | |
stdin is readable | |
stdout is writable | |
*/ |
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