built_in: improved to define DEFFILEMODE if not provided by the libc

musl libc doesn't provide the non-standard macros for common mode
bit masks, which other libc implementations like glibc define in
<sys/stat.h>.

Compile time error when building against musl libc:

--------------------------------------------------------------------------
netsniff-ng.c: In function 'read_pcap':
netsniff-ng.c:592:33: error: 'DEFFILEMODE' undeclared (first use in this function)
--------------------------------------------------------------------------

This change improves built_in.h to check if DEFFILEMODE is defined
and if not it defines it to be available internally.

Signed-off-by: Christian Wiese <chris@opensde.org>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/built_in.h b/built_in.h
index d7d4b6b..a3b7bf8 100644
--- a/built_in.h
+++ b/built_in.h
@@ -406,4 +406,8 @@ static inline u64 cpu_to_le64(u64 val)
 # define PACKET_KERNEL			7
 #endif
 
+#ifndef DEFFILEMODE
+# define DEFFILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH) /* 0666 */
+#endif
+
 #endif /* BUILT_IN_H */