Created
November 4, 2014 09:59
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udp server sample using libuv
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#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include "uv.h" | |
#define CHECK(r, msg) \ | |
if (r<0) { \ | |
fprintf(stderr, "%s: %s\n", msg, uv_strerror(r)); \ | |
exit(1); \ | |
} | |
static uv_loop_t *uv_loop; | |
static uv_udp_t server; | |
static void on_recv(uv_udp_t* handle, ssize_t nread, const uv_buf_t* rcvbuf, const struct sockaddr* addr, unsigned flags) { | |
if (nread > 0) { | |
printf("%lu\n",nread); | |
printf("%s",rcvbuf->base); | |
} | |
printf("free :%lu %p\n",rcvbuf->len,rcvbuf->base); | |
free(rcvbuf->base); | |
} | |
static void on_alloc(uv_handle_t* client, size_t suggested_size, uv_buf_t* buf) { | |
buf->base = malloc(suggested_size); | |
buf->len = suggested_size; | |
printf("malloc:%lu %p\n",buf->len,buf->base); | |
} | |
int main(int argc,char *argv[]) { | |
int status; | |
struct sockaddr_in addr; | |
uv_loop = uv_default_loop(); | |
status = uv_udp_init(uv_loop,&server); | |
CHECK(status,"init"); | |
uv_ip4_addr("0.0.0.0", 11000, &addr); | |
status = uv_udp_bind(&server, (const struct sockaddr*)&addr,0); | |
CHECK(status,"bind"); | |
status = uv_udp_recv_start(&server, on_alloc, on_recv); | |
CHECK(status,"recv"); | |
uv_run(uv_loop, UV_RUN_DEFAULT); | |
return 0; | |
} |
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LIBUV_HOME := $(HOME)/src/github.com/joyent/libuv | |
LIBUV := $(LIBUV_HOME)/build/Release/libuv.a | |
INC = $(LIBUV_HOME)/include | |
all: | |
gcc -o main -I$(INC) -Wall main.c $(LIBUV) | |
PHONY: all |
You can use uv_ip4_name() on the returned addr
parameter.
char sender[17] = { 0 };
uv_ip4_name((const struct sockaddr_in*) addr, sender, 16);
printf("Recv from %s\n", sender);
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Is there a way to get the IP address of the interface which received the frame in on_recv?