kopia lustrzana https://github.com/sp9skp/spdxl
83 wiersze
1.7 KiB
C
83 wiersze
1.7 KiB
C
/*
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* dxlAPRS toolchain
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*
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* Copyright (C) Christian Rabler <oe5dxl@oevsv.at>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#ifndef O_CLOEXEC
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# define O_CLOEXEC 02000000
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#endif
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int openudp()
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{
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int fd;
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/*return socket(PF_INET, SOCK_DGRAM|O_CLOEXEC, 0);*/
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fd = socket(PF_INET, SOCK_DGRAM, 0);
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fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
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return fd;
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}
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int bindudp(int fd, unsigned port)
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{
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struct sockaddr_in addr;
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port=htons(port);
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addr.sin_addr.s_addr=0; /* =inet_addr(ipnum); */
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return bind(fd, (struct sockaddr *)&addr, sizeof(addr));
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}
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int socknonblock(int fd)
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{
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int flags=fcntl(fd, F_GETFL, 0);
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if (flags<0) return -1;
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flags|=O_NONBLOCK;
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return fcntl(fd, F_SETFL, flags);
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}
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int udpreceive(int fd, char *buf, int blen, int *fromport, int *fromip)
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{
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int adrlen, len;
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struct sockaddr_in addr;
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adrlen=sizeof(addr);
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len=recvfrom(fd, buf, blen, MSG_DONTWAIT, (struct sockaddr *) &addr, &adrlen);
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*fromport=ntohs(addr.sin_port);
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*fromip=ntohl(addr.sin_addr.s_addr);
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return len;
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}
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int udpreceiveblock(int fd, char *buf, int blen, int *fromport, int *fromip)
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{
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int adrlen, len;
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struct sockaddr_in addr;
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adrlen=sizeof(addr);
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len=recvfrom(fd, buf, blen, 0, (struct sockaddr *) &addr, &adrlen);
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*fromport=ntohs(addr.sin_port);
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*fromip=ntohl(addr.sin_addr.s_addr);
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return len;
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}
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int udpsend(int fd, char *buf, int blen, int toport, int toip)
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{
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struct sockaddr_in addr;
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port=htons(toport);
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addr.sin_addr.s_addr=htonl(toip);
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return sendto(fd, buf, blen, 0, (struct sockaddr *) &addr, sizeof(addr));
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}
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