support _BSD_SOURCE feature test macro

patch by Isaac Dunham. matched closely (maybe not exact) to glibc's
idea of what _BSD_SOURCE should make visible.

include/sys/mman.h

@@ -27,6 +27,9 @@ int munlockall (void);
 
 #ifdef _GNU_SOURCE
 void *mremap (void *, size_t, size_t, int, ...);
+#endif
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 int madvise (void *, size_t, int);
 #endif
 

include/sys/stat.h

@@ -90,7 +90,7 @@ int utimensat(int, const char *, const struct timespec [2], int);
 int lchmod(const char *, mode_t);
 #endif
 
-#ifdef _GNU_SOURCE
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define S_IREAD S_IRUSR
 #define S_IWRITE S_IWUSR
 #define S_IEXEC S_IXUSR

include/sys/time.h

@@ -8,7 +8,8 @@ extern "C" {
 
 int gettimeofday (struct timeval *, void *);
 
-#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
+#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
+ || defined(_BSD_SOURCE)
 
 #define ITIMER_REAL    0
 #define ITIMER_VIRTUAL 1
@@ -26,7 +27,7 @@ int utimes (const char *, const struct timeval [2]);
 
 #endif
 
-#ifdef _GNU_SOURCE
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 int futimes(int, const struct timeval [2]);
 int lutimes(const char *, const struct timeval [2]);
 int settimeofday (const struct timeval *, void *);

include/sys/types.h

@@ -58,7 +58,7 @@ typedef __uint16_t u_int16_t;
 typedef __uint32_t u_int32_t;
 typedef __uint64_t u_int64_t;
 
-#ifdef _GNU_SOURCE
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 typedef char *caddr_t;
 typedef unsigned char u_char;
 typedef unsigned short u_short, ushort;

include/sys/wait.h

@@ -17,7 +17,7 @@ pid_t wait (int *);
 int waitid (idtype_t, id_t, siginfo_t *, int);
 pid_t waitpid (pid_t, int *, int );
 
-#ifdef _GNU_SOURCE
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #include <sys/resource.h>
 pid_t wait3 (int *, int, struct rusage *);
 pid_t wait4 (pid_t, int *, int, struct rusage *);