X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=unix%2Fuxsignal.c;fp=unix%2Fuxsignal.c;h=e21e0e8052d66216eca88923650152fb4d31bd66;hb=c64ad3bb0ceb7d453f3ee6e6f6a1727a6a8da9cc;hp=0000000000000000000000000000000000000000;hpb=95cd4797691e46e7cd6646a20226d306f734e6d9;p=PuTTY.git

diff --git a/unix/uxsignal.c b/unix/uxsignal.c
new file mode 100644
index 00000000..e21e0e80
--- /dev/null
+++ b/unix/uxsignal.c
@@ -0,0 +1,45 @@
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+/*
+ * Calling signal() is non-portable, as it varies in meaning
+ * between platforms and depending on feature macros, and has
+ * stupid semantics at least some of the time.
+ *
+ * This function provides the same interface as the libc function,
+ * but provides consistent semantics.  It assumes POSIX semantics
+ * for sigaction() (so you might need to do some more work if you
+ * port to something ancient like SunOS 4)
+ */
+void (*putty_signal(int sig, void (*func)(int)))(int) {
+    struct sigaction sa;
+    struct sigaction old;
+    
+    sa.sa_handler = func;
+    if(sigemptyset(&sa.sa_mask) < 0)
+	return SIG_ERR;
+    sa.sa_flags = SA_RESTART;
+    if(sigaction(sig, &sa, &old) < 0)
+	return SIG_ERR;
+    return old.sa_handler;
+}
+
+void block_signal(int sig, int block_it)
+{
+    sigset_t ss;
+
+    sigemptyset(&ss);
+    sigaddset(&ss, sig);
+    if(sigprocmask(block_it ? SIG_BLOCK : SIG_UNBLOCK, &ss, 0) < 0) {
+	perror("sigprocmask");
+	exit(1);
+    }
+}
+
+/*
+Local Variables:
+c-basic-offset:4
+comment-column:40
+End:
+*/