?? setsockopt.c
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#include <assert.h>#include <errno.h>#include <stdio.h>#include <sys/ioctl.h>#include <sys/socket.h>#include <sys/types.h>#include <net/gen/in.h>#include <net/gen/tcp.h>#include <net/gen/tcp_io.h>#define DEBUG 0static int _tcp_setsockopt(int socket, int level, int option_name, const void *option_value, socklen_t option_len);int setsockopt(int socket, int level, int option_name, const void *option_value, socklen_t option_len){ int r; nwio_tcpopt_t tcpopt; r= ioctl(socket, NWIOGTCPOPT, &tcpopt); if (r != -1 || errno != ENOTTY) { if (r == -1) { /* Bad file descriptor */ return -1; } return _tcp_setsockopt(socket, level, option_name, option_value, option_len); }#if DEBUG fprintf(stderr, "setsockopt: not implemented for fd %d\n", socket);#endif errno= ENOSYS; return -1;}static int _tcp_setsockopt(int socket, int level, int option_name, const void *option_value, socklen_t option_len){ int i; if (level == SOL_SOCKET && option_name == SO_KEEPALIVE) { if (option_len != sizeof(i)) { errno= EINVAL; return -1; } i= *(int *)option_value; if (!i) { /* At the moment there is no way to turn off * keepalives. */ errno= ENOSYS; return -1; } return 0; }#if DEBUG fprintf(stderr, "_tcp_setsocketopt: level %d, name %d\n", level, option_name);#endif errno= ENOSYS; return -1;}
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