20110512-2206

cygwin.c

@@ -0,0 +1,62 @@
+/* compatability layer for u9fs support on CYGWIN */
+
+#include <unistd.h>
+#include <errno.h>
+
+ssize_t
+pread(int fd, void *p, size_t n, off_t off)
+{
+	off_t ooff;
+	int oerrno;
+
+	if ((ooff  = lseek(fd, off, SEEK_SET)) == -1)
+		return -1;
+
+	n = read(fd, p, n);
+
+	oerrno = errno;
+	lseek(fd, ooff, SEEK_SET);
+	errno = oerrno;
+
+	return n;
+}
+
+ssize_t
+pwrite(int fd, const void *p, size_t n, off_t off)
+{
+	off_t ooff;
+	int oerrno;
+
+	if ((ooff  = lseek(fd, off, SEEK_SET)) == -1)
+		return -1;
+
+	n = write(fd, p, n);
+
+	oerrno = errno;
+	lseek(fd, ooff, SEEK_SET);
+	errno = oerrno;
+
+	return n;
+}
+
+int
+setreuid(int ruid, int euid)
+{
+	if (ruid != -1)
+		if (setuid(ruid) == -1)
+			return(-1);
+	if (euid != -1)
+		if (seteuid(euid) == -1)
+			return(-1);
+}
+
+int
+setregid(int rgid, int egid)
+{
+	if (rgid != -1)
+		if (setgid(rgid) == -1)
+			return(-1);
+	if (egid != -1)
+		if (setegid(egid) == -1)
+			return(-1);
+}