Initial commit

tasks/libposix/write.c

@@ -0,0 +1,44 @@
+/*
+ * l4/posix glue for write()
+ *
+ * Copyright (C) 2007 Bahadir Balban
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <l4lib/arch/syscalls.h>
+#include <l4lib/arch/syslib.h>
+#include <l4lib/ipcdefs.h>
+
+static inline int l4_write(int fd, const void *buf, size_t count)
+{
+	size_t wrcnt;
+
+	write_mr(L4SYS_ARG0, fd);
+	write_mr(L4SYS_ARG1, (const unsigned long)buf);
+	write_mr(L4SYS_ARG2, count);
+
+	/* Call pager with shmget() request. Check ipc error. */
+	if ((errno = l4_sendrecv(VFS_TID, VFS_TID, L4_IPC_TAG_WRITE)) < 0) {
+		printf("%s: L4 IPC Error: %d.\n", __FUNCTION__, errno);
+		return -1;
+	}
+	/* Check if syscall itself was successful */
+	if ((wrcnt = l4_get_retval()) < 0) {
+		printf("%s: WRITE Error: %d.\n", __FUNCTION__, (int)wrcnt);
+		errno = (int)wrcnt;
+		return -1;
+
+	}
+	return wrcnt;
+}
+
+ssize_t write(int fd, const void *buf, size_t count)
+{
+	if (!count)
+		return 0;
+
+	return l4_write(fd, buf, count);
+}
+