mirror of
https://github.com/troglobit/libuev.git
synced 2026-10-01 05:22:25 +07:00
Joachim Nilsson
2bea4192db
If an I/O watcher callback fails to read(), returning zero, we check events for UEV_HUP to detect EOF or socket remote end shutdown(). Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
/* Example of how to handle stdin redirect
|
|
*
|
|
* The problem is non-trivial since Linux epoll, which libuEv uses, does
|
|
* not support I/O watchers for regular files or directories.
|
|
*
|
|
* This works:
|
|
* echo foo | redirect
|
|
* This doesn't:
|
|
* redirect < foo.txt
|
|
*
|
|
* However, with a little bit of hacking libuEv can be made to handle
|
|
* reading from stdin as a special case.
|
|
*/
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include "src/uev.h"
|
|
|
|
void process_stdin(uev_t *w, void *arg, int events)
|
|
{
|
|
char buf[256];
|
|
int len;
|
|
|
|
if (UEV_ERROR == events) {
|
|
warnx("Spurious problem with the stdin watcher, restarting.");
|
|
uev_io_start(w);
|
|
}
|
|
|
|
len = read(w->fd, buf, sizeof(buf));
|
|
if (len == -1) {
|
|
warn("Error reading from stdin");
|
|
return;
|
|
}
|
|
|
|
if (len == 0 || UEV_HUP == events) {
|
|
warnx("Connection closed.");
|
|
return;
|
|
}
|
|
|
|
printf("Read %d bytes\n", len);
|
|
if (write(STDOUT_FILENO, buf, len) != len)
|
|
warn("Failed writing to stdout");
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int ret;
|
|
uev_t watcher;
|
|
uev_ctx_t ctx;
|
|
|
|
uev_init(&ctx);
|
|
|
|
ret = uev_io_init(&ctx, &watcher, process_stdin, NULL, STDIN_FILENO, UEV_READ);
|
|
if (ret)
|
|
err(errno, "Failed setting up STDIN watcher");
|
|
|
|
return uev_run(&ctx, 0);
|
|
}
|
|
|
|
/**
|
|
* Local Variables:
|
|
* compile-command: "make redirect; echo hej > hej.txt; ./redirect < hej.txt"
|
|
* indent-tabs-mode: t
|
|
* c-file-style: "linux"
|
|
* End:
|
|
*/
|