]>
Commit | Line | Data |
---|---|---|
718e3744 | 1 | /* |
2 | * Network library. | |
3 | * Copyright (C) 1997 Kunihiro Ishiguro | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with GNU Zebra; see the file COPYING. If not, write to the Free | |
19 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | * 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #include <zebra.h> | |
a269d613 | 24 | #include "log.h" |
25 | #include "network.h" | |
718e3744 | 26 | |
27 | /* Read nbytes from fd and store into ptr. */ | |
28 | int | |
02ff83c5 | 29 | readn (int fd, u_char *ptr, int nbytes) |
718e3744 | 30 | { |
31 | int nleft; | |
32 | int nread; | |
33 | ||
34 | nleft = nbytes; | |
35 | ||
36 | while (nleft > 0) | |
37 | { | |
38 | nread = read (fd, ptr, nleft); | |
39 | ||
40 | if (nread < 0) | |
41 | return (nread); | |
42 | else | |
43 | if (nread == 0) | |
44 | break; | |
45 | ||
46 | nleft -= nread; | |
47 | ptr += nread; | |
48 | } | |
49 | ||
50 | return nbytes - nleft; | |
51 | } | |
52 | ||
53 | /* Write nbytes from ptr to fd. */ | |
54 | int | |
b04c699e | 55 | writen(int fd, const u_char *ptr, int nbytes) |
718e3744 | 56 | { |
57 | int nleft; | |
58 | int nwritten; | |
59 | ||
60 | nleft = nbytes; | |
61 | ||
62 | while (nleft > 0) | |
63 | { | |
64 | nwritten = write(fd, ptr, nleft); | |
65 | ||
66 | if (nwritten <= 0) | |
67 | return (nwritten); | |
68 | ||
69 | nleft -= nwritten; | |
70 | ptr += nwritten; | |
71 | } | |
72 | return nbytes - nleft; | |
73 | } | |
a269d613 | 74 | |
75 | int | |
76 | set_nonblocking(int fd) | |
77 | { | |
42218e71 | 78 | int flags; |
79 | ||
80 | /* According to the Single UNIX Spec, the return value for F_GETFL should | |
81 | never be negative. */ | |
82 | if ((flags = fcntl(fd, F_GETFL)) < 0) | |
83 | { | |
84 | zlog_warn("fcntl(F_GETFL) failed for fd %d: %s", | |
85 | fd, safe_strerror(errno)); | |
86 | return -1; | |
87 | } | |
88 | if (fcntl(fd, F_SETFL, (flags | O_NONBLOCK)) < 0) | |
a269d613 | 89 | { |
90 | zlog_warn("fcntl failed setting fd %d non-blocking: %s", | |
91 | fd, safe_strerror(errno)); | |
92 | return -1; | |
93 | } | |
94 | return 0; | |
95 | } |