22 lines
450 B
C
22 lines
450 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <sys/select.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
|
|
int read_with_timeout(int fd, char *buf, size_t count, long usec)
|
|
{
|
|
const long M = 1000 * 1000;
|
|
struct timeval tv = { usec / M, usec % M };
|
|
fd_set fds;
|
|
int err;
|
|
|
|
FD_ZERO(&fds);
|
|
FD_SET(fd, &fds);
|
|
err = select(fd + 1, &fds, NULL, NULL, &tv);
|
|
if (err < 0)
|
|
return err;
|
|
if (FD_ISSET(fd, &fds))
|
|
return read(fd, buf, count);
|
|
return -EAGAIN;
|
|
}
|