Include <fcntl.h> unconditionally

It is used for open() which is in POSIX.1-2001, POSIX.1-2008.

libpcap has included <fcntl.h> unconditionally since at least 1999.

(cherry picked from commit f81ffd1)

Author: fxlb

CMakeLists.txt

@@ -344,7 +344,6 @@ cmake_pop_check_state()
 #
 # Header files.
 #
-check_include_file(fcntl.h HAVE_FCNTL_H)
 check_include_file(rpc/rpc.h HAVE_RPC_RPC_H)
 check_include_file(net/if.h HAVE_NET_IF_H)
 if(HAVE_RPC_RPC_H)

cmakeconfig.h.in

@@ -39,9 +39,6 @@
 /* Define to 1 if you have the `EVP_DecryptInit_ex' function. */
 #cmakedefine HAVE_EVP_DECRYPTINIT_EX 1
 
-/* Define to 1 if you have the <fcntl.h> header file. */
-#cmakedefine HAVE_FCNTL_H 1
-
 /* Define to 1 if you have the `fork' function. */
 #cmakedefine HAVE_FORK 1
 

configure.ac

@@ -31,7 +31,7 @@ fi
 AC_LBL_C_INIT(V_CCOPT, V_INCLS)
 AC_LBL_C_INLINE
 
-AC_CHECK_HEADERS(fcntl.h rpc/rpc.h rpc/rpcent.h net/if.h)
+AC_CHECK_HEADERS(rpc/rpc.h rpc/rpcent.h net/if.h)
 #
 # Get the size of a void *, to know whether this is a 32-bit or 64-bit build.
 #

tcpdump.c

@@ -63,9 +63,7 @@ The Regents of the University of California.  All rights reserved.\n";
 
 #include <sys/stat.h>
 
-#ifdef HAVE_FCNTL_H
 #include <fcntl.h>
-#endif
 
 #ifdef HAVE_LIBCRYPTO
 #include <openssl/crypto.h>