Add generic_signal() handler, which sets toys.signal and writes byte to toys.signalfd if set.

2 files changed, 13 insertions, 0 deletions

diff --git a/lib/lib.c b/lib/lib.c
index 1ab80351..bbe8f33c 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -614,12 +614,24 @@ static struct signame signames[] = {
 // not in posix: SIGNIFY(STKFLT), SIGNIFY(WINCH), SIGNIFY(IO), SIGNIFY(PWR)
 // obsolete: SIGNIFY(PROF) SIGNIFY(POLL)
 
+// Handler that sets toys.signal, and writes to toys.signalfd if set
+void generic_signal(int sig)
+{
+  if (toys.signalfd) {
+    char c = sig;
+
+    writeall(toys.signalfd, &c, 1);
+  }
+  toys.signal = sig;
+}
+
 // Install the same handler on every signal that defaults to killing the process
 void sigatexit(void *handler)
 {
   int i;
   for (i=0; signames[i].num != SIGCHLD; i++) signal(signames[i].num, handler);
 }
+
 // Convert name to signal number.  If name == NULL print names.
 int sig_to_num(char *pidstr)
 {
diff --git a/lib/lib.h b/lib/lib.h
index f8fcd8fe..097e67d8 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -174,6 +174,7 @@ struct mtab_list *xgetmountlist(char *path);
 
 // signal
 
+void generic_signal(int signal);
 void sigatexit(void *handler);
 int sig_to_num(char *pidstr);
 char *num_to_sig(int sig);