1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (C) 2018 Universita` di Pisa
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32 #include <sys/types.h>
33 #include <sys/stat.h>
34 #include <sys/ioctl.h>
35 #include <sys/mman.h>
36 #include <fcntl.h>
37 #include <stdlib.h>
38 #include <stdio.h>
39 #include <stdarg.h>
40 #include <string.h>
41 #include <unistd.h>
42 #include <errno.h>
43 #include <net/netmap_user.h>
44 #define LIBNETMAP_NOTHREADSAFE
45 #include "libnetmap.h"
46
47 static void
nmctx_default_error(struct nmctx * ctx,const char * errmsg)48 nmctx_default_error(struct nmctx *ctx, const char *errmsg)
49 {
50 fprintf(stderr, "%s\n", errmsg);
51 }
52
53 static void *
nmctx_default_malloc(struct nmctx * ctx,size_t sz)54 nmctx_default_malloc(struct nmctx *ctx, size_t sz)
55 {
56 (void)ctx;
57 return malloc(sz);
58 }
59
60 static void
nmctx_default_free(struct nmctx * ctx,void * p)61 nmctx_default_free(struct nmctx *ctx, void *p)
62 {
63 (void)ctx;
64 free(p);
65 }
66
67 static struct nmctx nmctx_global = {
68 .verbose = 1,
69 .error = nmctx_default_error,
70 .malloc = nmctx_default_malloc,
71 .free = nmctx_default_free,
72 .lock = NULL,
73 };
74
75 static struct nmctx *nmctx_default = &nmctx_global;
76
77 struct nmctx *
nmctx_get(void)78 nmctx_get(void)
79 {
80 return nmctx_default;
81 }
82
83 struct nmctx *
nmctx_set_default(struct nmctx * ctx)84 nmctx_set_default(struct nmctx *ctx)
85 {
86 struct nmctx *old = nmctx_default;
87 nmctx_default = ctx;
88 return old;
89 }
90
91 #define MAXERRMSG 1000
92 void
nmctx_ferror(struct nmctx * ctx,const char * fmt,...)93 nmctx_ferror(struct nmctx *ctx, const char *fmt, ...)
94 {
95 char errmsg[MAXERRMSG];
96 va_list ap;
97 int rv;
98
99 if (!ctx->verbose)
100 return;
101
102 va_start(ap, fmt);
103 rv = vsnprintf(errmsg, MAXERRMSG, fmt, ap);
104 va_end(ap);
105
106 if (rv > 0) {
107 if (rv < MAXERRMSG) {
108 ctx->error(ctx, errmsg);
109 } else {
110 ctx->error(ctx, "error message too long");
111 }
112 } else {
113 ctx->error(ctx, "internal error");
114 }
115 }
116
117 void *
nmctx_malloc(struct nmctx * ctx,size_t sz)118 nmctx_malloc(struct nmctx *ctx, size_t sz)
119 {
120 return ctx->malloc(ctx, sz);
121 }
122
123 void
nmctx_free(struct nmctx * ctx,void * p)124 nmctx_free(struct nmctx *ctx, void *p)
125 {
126 ctx->free(ctx, p);
127 }
128
129 void
nmctx_lock(struct nmctx * ctx)130 nmctx_lock(struct nmctx *ctx)
131 {
132 if (ctx->lock != NULL)
133 ctx->lock(ctx, 1);
134 }
135
136 void
nmctx_unlock(struct nmctx * ctx)137 nmctx_unlock(struct nmctx *ctx)
138 {
139 if (ctx->lock != NULL)
140 ctx->lock(ctx, 0);
141 }
142