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POCygwin gcc compiling error
 

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    <p>I was trying to compile a C socket program in CYGWIN gcc but when I compile the client program it gives me the following error</p> <pre><code>client.h: In function ‘error’: client.h:11:5: warning: incompatible implicit declaration of built-in function ‘exit’ [enabled by default] exit(1); ^ client.h: In function ‘main’: client.h:30:9: warning: incompatible implicit declaration of built-in function ‘exit’ [enabled by default] exit(0); ^ client.h:36:5: warning: passing argument 2 of ‘connect’ from incompatible pointer type [enabled by default] if(connect(sockfd,&amp;serv_addr,sizeof(serv_addr)) &lt; 0) ^ In file included from client.h:3:0: /usr/include/sys/socket.h:28:7: note: expected ‘const struct sockaddr *’ but argument is of type ‘struct sockaddr_in *’ int connect (int, const struct sockaddr *, socklen_t); ^ </code></pre> <p>And when I tries to compile the server program it gives me the following error</p> <pre><code>server.h: In function ‘error’: server.h:8:5: warning: incompatible implicit declaration of built-in function ‘exit’ [enabled by default] exit(1); ^ server.h: In function ‘main’: server.h:18:9: warning: incompatible implicit declaration of built-in function ‘exit’ [enabled by default] exit(1); ^ server.h:23:5: warning: incompatible implicit declaration of built-in function ‘bzero’ [enabled by default] bzero((char *) &amp;serv_addr, sizeof(serv_addr)); ^ server.h:32:64: error: ‘client’ undeclared (first use in this function) newsockfd = accept(sockfd, (struct sockaddr *) &amp;cli_addr, &amp;client); ^ server.h:32:64: note: each undeclared identifier is reported only once for each function it appears in </code></pre> <p>So what is the solution to this</p>
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    1. COFor starters, don't put code in header files. Just the function declarations. The .c files is where the actual implementation should be. That may part of the problem. It sees "exit()" being used in the header file. Also, show a minimal example (i.e. show us your code) of what is not working.
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    2. COyou can find my code here http://stackoverflow.com/questions/17971513/socket-program-in-c-cannot-compile
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    3. COAre you including `stdlib.h`? Then you can see that exit is already declared, and you shouldn't declare it again. It is a build in function that should not be redefined.
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