?? getsockopt.c
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#include <assert.h>#include <errno.h>#include <stdio.h>#include <string.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_getsockopt(int socket, int level, int option_name, void *_RESTRICT option_value, socklen_t *_RESTRICT option_len);int getsockopt(int socket, int level, int option_name, void *_RESTRICT option_value, socklen_t *_RESTRICT 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_getsockopt(socket, level, option_name, option_value, option_len); }#if DEBUG fprintf(stderr, "getsockopt: not implemented for fd %d\n", socket);#endif errno= ENOSYS; return -1;}static int _tcp_getsockopt(int socket, int level, int option_name, void *_RESTRICT option_value, socklen_t *_RESTRICT option_len){ int i; if (level == SOL_SOCKET && option_name == SO_KEEPALIVE) { i= 1; /* Keepalive is always on */ if (*option_len < sizeof(i)) memcpy(option_value, &i, *option_len); else memcpy(option_value, &i, sizeof(i)); *option_len= sizeof(i); return 0; }#if DEBUG fprintf(stderr, "_tcp_getsocketopt: level %d, name %d\n", level, option_name);#endif errno= ENOSYS; return -1;}?? 快捷鍵說明
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