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[ÄÄÇ»ÅÍ, ³×Æ®¿öÅ©, Åë½Å] UDP daytime, echo ÇÁ·Î±×·¡¹Ö

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File : mydaytime-udp.c

/*-------------------------------------------------------
ÆÄÀϸí : mydaytime-udp.c
±â ´É : daytime ¼­ºñ½º¸¦ ¿ä±¸ÇÏ´Â UDP(ºñ¿¬°áÇü) Ŭ¶óÀ̾ðÆ®
ÄÄÆÄÀÏ : gcc -o mydaytime-udp mydaytime-udp.c -lsocket -lnsl
»ç¿ë¹ý : mydaytime-udp localhost
---------------------------------------------------------*/

#include
#include
#include
#include

int main(int argc, char *argv[]) {
int s, n;
int buf_len = 128;
char *haddr;
struct sockaddr_in server_addr;
char buf[buf_len+1];

if(argc != 2) {
printf("usage: %s ip_addressn", argv[0]);
exit(0);
}
haddr = argv[1];

/* ¼ÒÄÏ »ý¼º */
if((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
printf("can't create socketn");
exit(0);
}
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