By the way, the emcc compile command is emcc -g getip.c -o getip.js.
The emcc version is newest because I just installed it yesterday.
On Thursday, May 10, 2018 at 9:34:16 AM UTC+8, zhatian diao wrote:
>
> thanks for your reply!
>
> Here is the c source code:
>
> ---------------------------------------------
>
> #include <arpa/inet.h>
> #include <sys/socket.h>
> #include <netdb.h>
> #include <ifaddrs.h>
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <string.h>
>
> char * myFunction ();
>
> int main(int argc, char *argv[])
> {
> char *str = myFunction();
> printf("%s\n", str);
> return 0;
>
> }
>
> char * myFunction () {
>
> char *sub_str = malloc(1100 * sizeof(char));
> //char* sub_str = new char[100];
> char *split = ":";
> char *end = ";";
> struct ifaddrs *ifaddr, *ifa;
> int family, s;
> int x=0;
> char host[NI_MAXHOST];
>
> if (getifaddrs(&ifaddr) == -1)
> {
> perror("getifaddrs");
> exit(EXIT_FAILURE);
> }
>
>
> for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next)
> {
> if (ifa->ifa_addr == NULL)
> continue;
>
> s=getnameinfo(ifa->ifa_addr,sizeof(struct
> sockaddr_in),host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
>
> if(ifa->ifa_addr->sa_family==AF_INET)
> {
> if (s != 0)
> {
> printf("getnameinfo() failed: %s\n",
> gai_strerror(s));
> exit(EXIT_FAILURE);
> }
> if(x==0){
> strcpy(sub_str, ifa->ifa_name);
> strcat(sub_str, split);
> strcat(sub_str, host);
> strcat(sub_str, end);
> }else{
> strcat(sub_str, ifa->ifa_name);
> strcat(sub_str, split);
> strcat(sub_str, host);
> strcat(sub_str, end);
>
> }
> x++;
> }
> }
>
> int len = strlen(sub_str);
> sub_str[len - 1] = '\0';
> freeifaddrs(ifaddr);
> return sub_str;
>
> }
>
>
> ---------------------------------------------------
>
> and the command-line flags is gcc -o getip getip.c
>
> On Thursday, May 10, 2018 at 12:00:00 AM UTC+8, Brion Vibber wrote:
>>
>> On Wed, May 9, 2018, 6:28 AM zhatian diao <[email protected]> wrote:
>>
>>> Hello everyone , I m new to emcc.
>>>
>>> Today I followed the user guide to install emcc and run the hello
>>> world example successfully.
>>>
>>
>> Welcome! :)
>>
>>
>>> However, things went wrong when I tried to compile another c file to
>>> js file.
>>>
>>> At first, I got an error
>>>
>>> testfiles/getip.c:10:17: fatal error: 'linux/if_link.h' file not
>>> found
>>> #include <linux/if_link.h>
>>> ^~~~~~~~~~~~~~~~~
>>> 1 error generated.
>>> ERROR:root:compiler frontend failed to generate LLVM bitcode,
>>> halting
>>>
>>> The strange thing is that I compiled the c file early with gcc
>>> without error. It can be run successfully.
>>>
>>
>> emscripten is not Linux, and does not include Linux-specific kernel
>> interfaces. Think of it as cross-compiling to another operating system...
>> If your source code needs linux/if_link.h for Linux-specific code, it will
>> need to be modified to build for emscripten.
>>
>> Note that the networking support in emscripten is limited because the web
>> runtime limited what is possible; you can't look up IP addresses or connect
>> to arbitrary hosts or ports. Make sure your test program is something that
>> would actually work.
>>
>>
>>> So I changed my code and removed "<linux/if_link.h>". I got another
>>> compile warning: warning:unresolved symbol: htons.
>>>
>>
>> It s source c code can also be compiled with gcc.
>>>
>>> Is there anything I missed or unconfigured?
>>>
>>>
>>>
>>>
>>> Compile enviroment : ubuntu
>>>
>>> head include:
>>>
>>> #include <arpa/inet.h>
>>> #include <sys/socket.h>
>>> #include <netdb.h>
>>> #include <ifaddrs.h>
>>> #include <stdio.h>
>>> #include <stdlib.h>
>>> #include <unistd.h>
>>> #include <string.h>
>>> #include <linux/if_link.h>
>>>
>>
>> htons is defined in arpa/inet.h which you're also including, so it should
>> work. Can you provide a minimal test case? (Small complete .c file that can
>> be compiled, and the command-line flags you're using to compile it)
>>
>> -- brion
>>
>
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