Even after trying all orders of header file inclusion,
I still get the error for netinet/in.h
/usr/include/netinet/in.h:34: error: expected identifier before numeric constant
I have included the following header files
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <linux/if_tun.h>
#include <sys/select.h>
#include <fcntl.h>
#include <sys/types.h>
#include <errno.h>
#include <netinet/ip.h>
#include <netinet/in.h>
How do I get rid of this error?
I compile with gcc -g3 -Wall.
netinet/in.h doesn't have header guard so what's happening is some variable is already been defined in netinet/ip.h header file. try pushing netinet/in.h to beginning of the file.
Related
I've created a c project and this is the beginning of the main.c file:
#include <curl/curl.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "include/httpdef.h"
//...some code
The httpdef.h beginning is this:
#ifndef httpdef
#define httpdef
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include <curl/curl.h>
//definitions
#endif
At the very first line of both files I get the error from the gcc compiler:
macro name must be an identifier
What could be the problem?
EDIT: I realized now that actually the compiler doesn't give any error, it's my vim plugin (YouCOmpleteMe) that generates this error. If I compile everything works and the error doesn't appear
I am having issues compiling my code. It seems to an issue with the include headers
Here are my headers:
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#include <limits.h>
#include <signal.h>
#include <unistd.h>
#include <sys/uio.h>
#include <sys/mman.h>
#include <asm/page.h>
#define __KERNEL__
#include <asm/unistd.h>
Here's what I am using to compile:
gcc -o file file.c -I/usr/src/linux-headers-4.12.0-kali2-common/include/asm-generic
I keep getting this error when I compile:
fatal error: uapi/asm-generic/signal.h: No such file or directory
#include <uapi/asm-generic/signal.h>
If I try adding asm/ or asm-generic/ to signal.h, I get:
redefinition of ‘struct timeval’
I have a c Program and it was running Perfectly, but now i want to run it in Windows. So i am trying to compile the code in the Windows 7 Operating System, using Turboc3.
When i am compiling, i am getting an error "Unable to open include file Protocols.h"
But the Protocols.h file exists in the Directory. And all the directories are set perfectly in the C compiler.
From .c file it will include one .h file, and from that .h file another .h file is included.
But still i am facing the same issue, Can anyone help me out.
The header i have is like below:
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <signal.h>
//#include <wait.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/types.h>
//#include <ipc.h>
//#include <shm.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#define socklen_t int
/* limit values */
#define MAX_TAGS 500
#define MAX_OBJECTS 500
#include "Protocols.h"
If you really set the correct path in you compiler, you could try to hardcode the path like #include "/path/name.h".
If this works, you have some issue with your compiler and maybe not set the path (the right way).
If this does not work it seems, that the file is not existing or broken in some way. In this case: Get a new version of the headerfile and make sure, that it is in the right place.
I have a piece of code that used to work in some environment a long time ago. I'm pretty sure it was a FreeBSD machine so I got FreeBSD 8.3 and I'm trying to make this file but it's not working.
When I try to compile it it complains with:
f.c: In function 'tcp'>
f.c:24: error: storage size of 'socket_stru' isn't known
f.c:29: error: 'IPPROTO_TCP' undeclared (first use in this function)
...
I've been looking around and I see these are all specified in the sys/socket.h file. This is my actual file:
#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <sys/socket.h>
#include <unistd.h>
#include "f.h"
int tcp4 (in_addr_t ip, int port, int qsize )
{
struct sockaddr_in socket_stru; // line 24
socket_stru.sin_family = AF_INET;
socket_stru.sin_port = htons(port);
socket_stru.sin_addr.s_addr = ip;
int actual_socket = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); // line 29
...
I feel like my code somehow doesn't "read" the sys/socket.h file so it doesn't know about socket_stru and IPPROTO_TCP, but I'm just really lost.
Any ideas?
None of the other answers worked for me. After taking a look inside the sys/socket.h file, I didn't even see a definition for struct sockaddr_in.
What worked for me was to #include one of the following files when using the corresponding struct sockaddr_* type:
if you're using struct sockaddr_in, #include <netinet/in.h>
if you're using struct sockaddr_un, #include <sys/un.h>
if you're using struct sockaddr_ns, #include <netns/ns.h>
if you're using struct sockaddr_ndd, #include <sys/ndd_var.h>
More information on the header files for socket programming can be found here.
I cut and paste your code into a file (removing only the #include f.h and closed off the function call.) It compiles just fine on Linux.
I suspect there may be header files differences on BSD. For socket programming, I typically include ALL these header files. And I know my socket code compiles on BSD as well. I suspect one of these header files brings in the definition for sockaddr_in. I recall when I ported by socket code to BSD, I had to explicitly add a few of these.
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/time.h>
#include <stdlib.h>
#include <memory.h>
#include <ifaddrs.h>
#include <net/if.h>
#include <stdarg.h>
/* the next two includes probably aren't relevant for you, but I typically use them all anyway */
#include <math.h>
#include <sys/termios.h>
Hope this helps
I had the same problem, but the following include fixed the issue for me
#include <arpa/inet.h>
Just add #include <resolv.h> to your source and you are good to go.
According to freebsd developer's handbook you need
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
Everything goes well with this statement:
fnmatch(pattern, href, FNM_EXTMATCH);
when I oder the header files as below:
#include <fnmatch.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "link.h"
But the gcc says that FNM_EXTMATCH not defined when I order the head files instead as below:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fnmatch.h>
#include "link.h"
So where is the conflict?
FNM_EXTMATCH is a GNU extension. If you wish to use it, put
#define _GNU_SOURCE
at the top of your file (before any #include statements). Note, however, that it will not be portable to non-GNU systems -- those without gcc and glibc.