summaryrefslogtreecommitdiffstats
path: root/src/util/posix_signals.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/util/posix_signals.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/src/util/posix_signals.c b/src/util/posix_signals.c
new file mode 100644
index 0000000..8ccddf0
--- /dev/null
+++ b/src/util/posix_signals.c
@@ -0,0 +1,126 @@
+/*++
+/* NAME
+/* posix_signals 3
+/* SUMMARY
+/* POSIX signal handling compatibility
+/* SYNOPSIS
+/* #include <posix_signals.h>
+/*
+/* int sigemptyset(m)
+/* sigset_t *m;
+/*
+/* int sigaddset(set, signum)
+/* sigset_t *set;
+/* int signum;
+/*
+/* int sigprocmask(how, set, old)
+/* int how;
+/* sigset_t *set;
+/* sigset_t *old;
+/*
+/* int sigaction(sig, act, oact)
+/* int sig;
+/* struct sigaction *act;
+/* struct sigaction *oact;
+/* DESCRIPTION
+/* These routines emulate the POSIX signal handling interface.
+/* AUTHOR(S)
+/* Pieter Schoenmakers
+/* Eindhoven University of Technology
+/* P.O. Box 513
+/* 5600 MB Eindhoven
+/* The Netherlands
+/*--*/
+
+/* System library. */
+
+#include "sys_defs.h"
+#include <signal.h>
+#include <errno.h>
+
+/* Utility library.*/
+
+#include "posix_signals.h"
+
+#ifdef MISSING_SIGSET_T
+
+int sigemptyset(sigset_t *m)
+{
+ return *m = 0;
+}
+
+int sigaddset(sigset_t *set, int signum)
+{
+ *set |= sigmask(signum);
+ return 0;
+}
+
+int sigprocmask(int how, sigset_t *set, sigset_t *old)
+{
+ int previous;
+
+ if (how == SIG_BLOCK)
+ previous = sigblock(*set);
+ else if (how == SIG_SETMASK)
+ previous = sigsetmask(*set);
+ else if (how == SIG_UNBLOCK) {
+ int m = sigblock(0);
+
+ previous = sigsetmask(m & ~*set);
+ } else {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (old)
+ *old = previous;
+ return 0;
+}
+
+#endif
+
+#ifdef MISSING_SIGACTION
+
+static struct sigaction actions[NSIG] = {};
+
+static int sighandle(int signum)
+{
+ if (signum == SIGCHLD) {
+ /* XXX If the child is just stopped, don't invoke the handler. */
+ }
+ actions[signum].sa_handler(signum);
+}
+
+int sigaction(int sig, struct sigaction *act, struct sigaction *oact)
+{
+ static int initialized = 0;
+
+ if (!initialized) {
+ int i;
+
+ for (i = 0; i < NSIG; i++)
+ actions[i].sa_handler = SIG_DFL;
+ initialized = 1;
+ }
+ if (sig <= 0 || sig >= NSIG) {
+ errno = EINVAL;
+ return -1;
+ }
+ if (oact)
+ *oact = actions[sig];
+
+ {
+ struct sigvec mine = {
+ sighandle, act->sa_mask,
+ act->sa_flags & SA_RESTART ? SV_INTERRUPT : 0
+ };
+
+ if (sigvec(sig, &mine, NULL))
+ return -1;
+ }
+
+ actions[sig] = *act;
+ return 0;
+}
+
+#endif