Move sig_to_num and num_to_sig into portability.c.

macOS doesn't have real-time signals, and it has a slightly different
set of non-portable signals from Linux.

With this, the toybox `kill -l` output matches the default macOS kill(1).

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/portability.h b/lib/portability.h
index c955eddf..69580da5 100644
--- a/lib/portability.h
+++ b/lib/portability.h
@@ -332,3 +332,12 @@ int xnotify_wait(struct xnotify *not, char **path);
 #ifdef __APPLE__
 #define f_frsize f_iosize
 #endif
+
+int sig_to_num(char *s);
+char *num_to_sig(int sig);
+
+struct signame {
+  int num;
+  char *name;
+};
+void xsignal_all_killers(void *handler);