inet_ntoa函数在编译时候报 ”warning: assignment makes pointer from integer without a cast“ 告警

来源：互联网发布：天猫双11交易数据编辑：程序博客网时间：2024/05/21 09:19

编译有告警代码

#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <stdio.h>/*    char *inet_ntoa(struct in_addr in)    int inet_aton(const char *cp, struct in_addr *inp);    // struct sockaddr_in server_ip;*/int main(){    int ret = 0;    char *ip_addr = NULL;    struct in_addr byte_addr = {0};    const char ipaddress[] = "192.168.1.5";    ret = inet_aton(ipaddress, &byte_addr);    printf("inet_aton return %d\n", ret);    printf("byte addr is (0x%x)\n", byte_addr.s_addr);    printf("byte 0 value[0x%x]\n", *((unsigned char *)&byte_addr.s_addr));    printf("byte 1 value[0x%x]\n", *((unsigned char *)&byte_addr.s_addr + 1));    printf("byte 2 value[0x%x]\n", *((unsigned char *)&byte_addr.s_addr + 2));    printf("byte 3 value[0x%x]\n", *((unsigned char *)&byte_addr.s_addr + 3));    /* 将网络字节序的IP地址再转换为字符串形式*/    ip_addr = inet_ntoa(byte_addr);    printf("ip address [%s]\n", ip_addr);        return 0;}

编译结果：

gcc -E server.c -o server.igcc -S server.c -o server.sserver.c: In function 'main':server.c:30:13: warning: assignment makes pointer from integer without a castgcc -g server.c -o serverserver.c: In function 'main':server.c:30:13: warning: assignment makes pointer from integer without a cast

很奇怪为什么会报告警

inet_ntoa函数原型

/* Convert Internet number in IN to ASCII representation.  The return value   is a pointer to an internal array containing the string.  */extern char *inet_ntoa (struct in_addr __in) __THROW;

该定义在 arpa/inet.h中，所以在代码中包含这个头文件，再次进行编译，无告警

gcc -E server.c -o server.igcc -S server.c -o server.sgcc -g server.c -o server

已经没有告警；应该是没有包含正确的头文件，导致引用了错误的原型声明（没有找到这个错误的原型声明在哪个头文件中）

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