| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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 | |
| 10 | #include "libbb.h" |
| 11 | |
| 12 | /* try to open up the specified device */ |
| 13 | int FAST_FUNC device_open(const char *device, int mode) |
| 14 | { |
| 15 | int m, f, fd; |
| 16 | |
| 17 | m = mode | O_NONBLOCK; |
| 18 | |
| 19 | /* Retry up to 5 times */ |
| 20 | /* TODO: explain why it can't be considered insane */ |
| 21 | for (f = 0; f < 5; f++) { |
| 22 | fd = open(device, m, 0600); |
| 23 | if (fd >= 0) |
| 24 | break; |
| 25 | } |
| 26 | if (fd < 0) |
| 27 | return fd; |
| 28 | /* Reset original flags. */ |
| 29 | if (m != mode) |
| 30 | fcntl(fd, F_SETFL, mode); |
| 31 | return fd; |
| 32 | } |