9.1 SO_SNDBUF & SO_RCVBUF

ch09/README.md

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+## 第 9 章 套接字的多种可选项

ch09/get_buf.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/socket.h>
+void error_handling(char *message);
+
+int main(int argc, char *argv[])
+{
+    int sock;
+    int snd_buf, rcv_buf, state;
+    socklen_t len;
+
+    sock = socket(PF_INET, SOCK_STREAM, 0);
+    len = sizeof(snd_buf);
+    state = getsockopt(sock, SOL_SOCKET, SO_SNDBUF, (void *)&snd_buf, &len);
+    if (state)
+        error_handling("getsockopt() error");
+
+    len = sizeof(rcv_buf);
+    state = getsockopt(sock, SOL_SOCKET, SO_RCVBUF, (void *)&rcv_buf, &len);
+    if (state)
+        error_handling("getsockopt() error");
+
+    printf("Input buffer size: %d \n", rcv_buf);
+    printf("Output buffer size: %d \n", snd_buf);
+
+    return 0;
+}
+void error_handling(char *message)
+{
+    fputs(message, stderr);
+    fputc('\n', stderr);
+    exit(1);
+}

ch09/sock_type.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/socket.h>
+void error_handling(char *message);
+
+int main(int argc, char *argv[])
+{
+    int tcp_sock, udp_sock;
+    int sock_type;
+    socklen_t optlen;
+    int state;
+
+    optlen = sizeof(sock_type);
+    tcp_sock = socket(PF_INET, SOCK_STREAM, 0);
+    udp_sock = socket(PF_INET, SOCK_DGRAM, 0);
+    printf("SOCK_STREAM: %d\n", SOCK_STREAM);
+    printf("SOCK_DGRAM: %d\n", SOCK_DGRAM);
+
+    state = getsockopt(tcp_sock, SOL_SOCKET, SO_TYPE, (void *)&sock_type, &optlen);
+    if (state)
+        error_handling("getsockopt() error");
+    printf("Socket type one: %d \n", sock_type);
+
+    state = getsockopt(udp_sock, SOL_SOCKET, SO_TYPE, (void *)&sock_type, &optlen);
+    if (state)
+        error_handling("getsockopt() error");
+    printf("Socket type two: %d \n", sock_type);
+    return 0;
+}
+void error_handling(char *message)
+{
+    fputs(message, stderr);
+    fputc('\n', stderr);
+    exit(1);
+}