mirror of
https://github.com/riba2534/TCP-IP-NetworkNote.git
synced 2026-02-03 10:03:17 +08:00
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#define BUF_SIZE 30
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void error_handling(char *message);
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int main(int argc, char *argv[])
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{
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int recv_sock;
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int str_len;
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char buf[BUF_SIZE];
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struct sockaddr_in adr;
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if (argc != 2)
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{
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printf("Usage : %s <PORT>\n", argv[0]);
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exit(1);
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}
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recv_sock = socket(PF_INET, SOCK_DGRAM, 0);
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memset(&adr, 0, sizeof(adr));
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adr.sin_family = AF_INET;
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adr.sin_addr.s_addr = htonl(INADDR_ANY);
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adr.sin_port = htons(atoi(argv[1]));
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if (bind(recv_sock, (struct sockaddr *)&adr, sizeof(adr)) == -1)
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error_handling("bind() error");
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while (1)
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{
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//通过 recvfrom 函数接受数据。如果不需要知道传输数据的主机地址信息，可以向recvfrom函数的第5 6参数分贝传入 NULL 0
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str_len = recvfrom(recv_sock, buf, BUF_SIZE - 1, 0, NULL, 0);
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if (str_len < 0)
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break;
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buf[str_len] = 0;
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fputs(buf, stdout);
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}
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close(recv_sock);
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return 0;
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}
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void error_handling(char *message)
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{
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fputs(message, stderr);
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fputc('\n', stderr);
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exit(1);
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} |