1 files changed, 60 insertions, 0 deletions
diff --git a/system-bsd.c b/system-bsd.c
new file mode 100644
index 0000000..3babaea
--- /dev/null
+++ b/system-bsd.c
@@ -0,0 +1,60 @@
+/* signal-safe read and write (for BSD slow devices). writeall() also
+allows partial writes */
+
+#include <errno.h>
+
+#include "rc.h"
+#include "jbwrap.h"
+#include "wait.h"
+
+Jbwrap slowbuf;
+volatile sig_atomic_t slow;
+
+static char *safe_buf;
+static size_t safe_remain;
+
+extern void writeall(int fd, char *buf, size_t remain) {
+	int i;
+
+	safe_buf = buf;
+	safe_remain = remain;
+	for (i = 0; safe_remain > 0; buf += i, safe_remain -= i) {
+		if (sigsetjmp(slowbuf.j, 1) == 0) {
+			slow = TRUE;
+			if ((i = write(fd, safe_buf, safe_remain)) <= 0)
+				break; /* abort silently on errors in write() */
+		} else
+			break;
+	}
+	slow = FALSE;
+	sigchk();
+}
+
+extern int rc_read(int fd, char *buf, size_t n) {
+	ssize_t r;
+
+	if (sigsetjmp(slowbuf.j, 1) == 0) {
+		slow = TRUE;
+		r = read(fd, buf, n);
+	} else {
+		errno = EINTR;
+		r = -1;
+	}
+	slow = FALSE;
+
+	return r;
+}
+
+static int r = -1;
+extern pid_t rc_wait(int *stat) {
+	if (sigsetjmp(slowbuf.j, 1) == 0) {
+		slow = TRUE;
+		r = wait(stat);
+	} else {
+		errno = EINTR;
+		r = -1;
+	}
+	slow = FALSE;
+
+	return r;
+}