58 lines
963 B
C
58 lines
963 B
C
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/* bsd-socket(2)-lookalike */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <net/gen/socket.h>
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#include <net/gen/emu.h>
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#include <net/gen/tcp.h>
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#include <net/gen/in.h>
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#include <net/gen/tcp_hdr.h>
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#include <net/gen/tcp_io.h>
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int
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socket(int domain, int type, int protocol)
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{
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int s;
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char *tcpname;
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/* only domain is AF_INET */
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if(domain != AF_INET) {
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errno = EAFNOSUPPORT;
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return -1;
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}
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/* only type is SOCK_STREAM */
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if(type != SOCK_STREAM) {
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errno = EPROTONOSUPPORT;
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return -1;
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}
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/* default protocol type is TCP */
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if(!protocol)
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protocol = IPPROTO_TCP;
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/* only protocol type is TCP */
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if(protocol != IPPROTO_TCP) {
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errno = EPROTONOSUPPORT;
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return -1;
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}
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/* tcp device name */
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if(!tcpname)
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tcpname = getenv("TCP_DEVICE");
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if(!tcpname || !*tcpname)
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tcpname = "/dev/tcp";
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if((s = open(tcpname, O_RDWR)) < 0) {
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perror(tcpname);
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return -1;
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}
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return s;
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}
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