1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 30 #include <sys/types.h> 31 #include <sys/stat.h> 32 #include <sys/ioctl.h> 33 #include <sys/mman.h> 34 #include <fcntl.h> 35 #include <stdlib.h> 36 #include <stdio.h> 37 #include <stdarg.h> 38 #include <string.h> 39 #include <unistd.h> 40 #include <errno.h> 41 #include <net/netmap_user.h> 42 #define LIBNETMAP_NOTHREADSAFE 43 #include "libnetmap.h" 44 45 static void 46 nmctx_default_error(struct nmctx *ctx, const char *errmsg) 47 { 48 (void)ctx; 49 fprintf(stderr, "%s\n", errmsg); 50 } 51 52 static void * 53 nmctx_default_malloc(struct nmctx *ctx, size_t sz) 54 { 55 (void)ctx; 56 return malloc(sz); 57 } 58 59 static void 60 nmctx_default_free(struct nmctx *ctx, void *p) 61 { 62 (void)ctx; 63 free(p); 64 } 65 66 static struct nmctx nmctx_global = { 67 .verbose = 1, 68 .error = nmctx_default_error, 69 .malloc = nmctx_default_malloc, 70 .free = nmctx_default_free, 71 .lock = NULL, 72 }; 73 74 static struct nmctx *nmctx_default = &nmctx_global; 75 76 struct nmctx * 77 nmctx_get(void) 78 { 79 return nmctx_default; 80 } 81 82 struct nmctx * 83 nmctx_set_default(struct nmctx *ctx) 84 { 85 struct nmctx *old = nmctx_default; 86 nmctx_default = ctx; 87 return old; 88 } 89 90 #define MAXERRMSG 1000 91 void 92 nmctx_ferror(struct nmctx *ctx, const char *fmt, ...) 93 { 94 char errmsg[MAXERRMSG]; 95 va_list ap; 96 int rv; 97 98 if (!ctx->verbose) 99 return; 100 101 va_start(ap, fmt); 102 rv = vsnprintf(errmsg, MAXERRMSG, fmt, ap); 103 va_end(ap); 104 105 if (rv > 0) { 106 if (rv < MAXERRMSG) { 107 ctx->error(ctx, errmsg); 108 } else { 109 ctx->error(ctx, "error message too long"); 110 } 111 } else { 112 ctx->error(ctx, "internal error"); 113 } 114 } 115 116 void * 117 nmctx_malloc(struct nmctx *ctx, size_t sz) 118 { 119 return ctx->malloc(ctx, sz); 120 } 121 122 void 123 nmctx_free(struct nmctx *ctx, void *p) 124 { 125 ctx->free(ctx, p); 126 } 127 128 void 129 nmctx_lock(struct nmctx *ctx) 130 { 131 if (ctx->lock != NULL) 132 ctx->lock(ctx, 1); 133 } 134 135 void 136 nmctx_unlock(struct nmctx *ctx) 137 { 138 if (ctx->lock != NULL) 139 ctx->lock(ctx, 0); 140 } 141