1 files changed, 41 insertions, 0 deletions
diff --git a/src/io/io-uio.c b/src/io/io-uio.c
new file mode 100644
index 0000000..dd9f873
--- /dev/null
+++ b/src/io/io-uio.c
@@ -0,0 +1,41 @@
+#include "io.h"
+#include <stdint.h>
+#include <err.h>
+#include <sys/uio.h>
+
+static size_t
+io_uio_do(const struct io *io, const void *ptr, const size_t offset, const size_t size, ssize_t (*iofun)(pid_t, const struct iovec*, unsigned long, const struct iovec*, unsigned long, unsigned long))
+{
+   const struct iovec lio = { .iov_base = (void*)ptr, .iov_len = size };
+   const struct iovec rio = { .iov_base = (void*)(intptr_t)offset, .iov_len = size };
+   return iofun(io->pid, &lio, 1, &rio, 1, 0);
+}
+
+static size_t
+io_uio_write(const struct io *io, const void *ptr, const size_t offset, const size_t size)
+{
+   const size_t ret = io_uio_do(io, ptr, offset, size, process_vm_writev);
+
+   if (ret == (size_t)-1)
+      warn("process_vm_writev(%u)", io->pid);
+
+   return (ret == (size_t)-1 ? 0 : ret);
+}
+
+static size_t
+io_uio_read(const struct io *io, void *ptr, const size_t offset, const size_t size)
+{
+   const size_t ret = io_uio_do(io, ptr, offset, size, process_vm_readv);
+
+   if (ret == (size_t)-1)
+      warn("process_vm_readv(%u)", io->pid);
+
+   return (ret == (size_t)-1 ? 0 : ret);
+}
+
+bool
+io_uio_init(struct io *io, const pid_t pid)
+{
+   *io = (struct io){ .pid = pid, .read = io_uio_read, .write = io_uio_write };
+   return true;
+}