35 lines
860 B
C
35 lines
860 B
C
|
/* vi: set sw=4 ts=4: */
|
||
|
|
/*
|
||
|
|
* Utility routines.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2007 by Denys Vlasenko <vda.linux@googlemail.com>
|
||
|
|
*
|
||
|
|
* Licensed under GPLv2, see file LICENSE in this tarball for details.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "libbb.h"
|
||
|
|
|
||
|
|
/* Wrapper which restarts poll on EINTR or ENOMEM.
|
||
|
|
* On other errors does perror("poll") and returns.
|
||
|
|
* Warning! May take longer than timeout_ms to return! */
|
||
|
|
int safe_poll(struct pollfd *ufds, nfds_t nfds, int timeout)
|
||
|
|
{
|
||
|
|
while (1) {
|
||
|
|
int n = poll(ufds, nfds, timeout);
|
||
|
|
if (n >= 0)
|
||
|
|
return n;
|
||
|
|
/* Make sure we inch towards completion */
|
||
|
|
if (timeout > 0)
|
||
|
|
timeout--;
|
||
|
|
/* E.g. strace causes poll to return this */
|
||
|
|
if (errno == EINTR)
|
||
|
|
continue;
|
||
|
|
/* Kernel is very low on memory. Retry. */
|
||
|
|
/* I doubt many callers would handle this correctly! */
|
||
|
|
if (errno == ENOMEM)
|
||
|
|
continue;
|
||
|
|
bb_perror_msg("poll");
|
||
|
|
return n;
|
||
|
|
}
|
||
|
|
}
|