udp測試程式 +　makefile

01 /*
02 ** talker.c -- a datagram "client" demo
03 */
04
05 #include
06 #include
07 #include
08 #include
09 #include
10 #include
11 #include
12 #include
13 #include
14 #include
15
16 #define SERVERPORT "4950"    // the port users will be connecting to
17
18 int main(int argc, char *argv[])
19 {
20     int sockfd;
21     struct addrinfo hints, *servinfo, *p;
22     int rv;
23     int numbytes;
24
25     if (argc != 3) {
26         fprintf(stderr,"usage: talker hostname messagen");
27         exit(1);
28     }
29
30     memset(&hints, 0, sizeof hints);
31     hints.ai_family = AF_UNSPEC;
32     hints.ai_socktype = SOCK_DGRAM;
33
34     if ((rv = getaddrinfo(argv[1], SERVERPORT, &hints, &servinfo)) != 0) {
35         fprintf(stderr, "getaddrinfo: %sn", gai_strerror(rv));
36         return 1;
37     }
38
39     // loop through all the results and make a socket
40     for(p = servinfo; p != NULL; p = p->ai_next) {
41         if ((sockfd = socket(p->ai_family, p->ai_socktype,
42                 p->ai_protocol)) == -1) {
43             perror("talker: socket");
44             continue;
45         }
46
47         break;
48     }
49
50     if (p == NULL) {
51         fprintf(stderr, "talker: failed to bind socketn");
52         return 2;
53     }
54
55     if ((numbytes = sendto(sockfd, argv[2], strlen(argv[2]), 0,
56              p->ai_addr, p->ai_addrlen)) == -1) {
57         perror("talker: sendto");
58         exit(1);
59     }
60
61     freeaddrinfo(servinfo);
62
63     printf("talker: sent %d bytes to %sn", numbytes, argv[1]);
64     close(sockfd);
65
66     return 0;
67 }

#    $Id: Makefile,v 1.5 2005/09/20 10:56:17 beah Exp $
#CROSS   = ppc_440ep-
#CROSS     = arm-soft_uclibc-linux-gnu-
CROSS    = arm-hismall-linux-
#CROSS    =
CC        = $(CROSS)gcc
STRIP    = $(CROSS)strip

BINDIR = /usr/local/sbin
MANDIR = /usr/local/man
CFLAGS+= -g -Wall
# CFLAGS+= -DHAS_FGETLN -DHAS_STRLCPY
# CFLAGS+= -Wall -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations
# CFLAGS+= -Wshadow -Wpointer-arith -Wcast-qual -Wsign-compare
LDFLAGS+= -lpthread

all:        talker
    $(STRIP) talker
    cp talker /tftpboot/
    cp talker /target/

talker:        talker.o
    $(CC) $(LDFLAGS) talker.o  $(LDLIBS) -o talker

talker.o:    talker.c
    $(CC) $(CFLAGS) -c talker.c


install:    all
    install -o root -g bin -m 0555 talker $(BINDIR)
#    install -o root -g wheel -m 0755 -d $(MANDIR)/man8
#    install -o root -g bin -m 0444 talker.8 $(MANDIR)/man8

clean:
    rm -f talker *.o