1 /* vi: set sw=4 ts=4: */
2 /*
3  * Utility routines.
4  *
5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6  *
7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8  */
9 #include "libbb.h"
10 
11 /* try to open up the specified device */
device_open(const char * device,int mode)12 int FAST_FUNC device_open(const char *device, int mode)
13 {
14 	int m, f, fd;
15 
16 	m = mode | O_NONBLOCK;
17 
18 	/* Retry up to 5 times */
19 	/* TODO: explain why it can't be considered insane */
20 	for (f = 0; f < 5; f++) {
21 		fd = open(device, m, 0600);
22 		if (fd >= 0)
23 			break;
24 	}
25 	if (fd < 0)
26 		return fd;
27 	/* Reset original flags. */
28 	if (m != mode)
29 		fcntl(fd, F_SETFL, mode);
30 	return fd;
31 }
32