rc

commit 2af5bbbb5355e9fcf311673f8051952c6b9b2509
parent 943fd3314e3955c9f6094ffeaef81f0fe5ab16f8
Author: tgoodwin <tgoodwin>
Date:   Tue, 17 Feb 1998 13:48:31 +0000

Initial revision

Diffstat:
A
system-bsd.c
 | 
50
++++++++++++++++++++++++++++++++++++++++++++++++++
A
system.c
 | 
14
++++++++++++++

2 files changed, 64 insertions(+), 0 deletions(-)
diff --git a/system-bsd.c b/system-bsd.c
@@ -0,0 +1,50 @@
+/* signal-safe read and write (for BSD slow devices). writeall() also
+allows partial writes */
+
+#include <errno.h>
+
+#include "rc.h"
+#include "jbwrap.h"
+
+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) {
+		interrupt_happened = FALSE;
+		if (!sigsetjmp(slowbuf.j, 1)) {
+			slow = TRUE;
+			if (interrupt_happened)
+				break;
+			else if ((i = write(fd, safe_buf, safe_remain)) <= 0)
+				break; /* abort silently on errors in write() */
+		} else
+			break;
+		slow = FALSE;
+	}
+	slow = FALSE;
+	sigchk();
+}
+
+extern int rc_read(int fd, char *buf, size_t n) {
+	long /*ssize_t*/ r;
+	interrupt_happened = FALSE;
+	if (!sigsetjmp(slowbuf.j, 1)) {
+		slow = TRUE;
+		if (!interrupt_happened)
+			r = read(fd, buf, n);
+		else
+			r = -2;
+	} else
+		r = -2;
+	slow = FALSE;
+	if (r == -2) {
+		errno = EINTR;
+		r = -1;
+	}
+	return r;
+}
diff --git a/system.c b/system.c
@@ -0,0 +1,14 @@
+#include "rc.h"
+
+extern void writeall(int fd, char *buf, size_t remain) {
+	int i;
+
+	for (i = 0; remain > 0; buf += i, remain -= i)
+		if ((i = write(fd, buf, remain)) <= 0)
+			break; /* abort silently on errors in write() */
+	sigchk();
+}
+
+extern int rc_read(int fd, char *buf, size_t n) {
+	return read(fd, buf, n);
+}