Adding upstream version 0.0~git20221206.8b7148f.upstream/0.0_git20221206.8b7148f

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/libc-bottom-half/cloudlibc/src/libc/unistd/pread.c b/libc-bottom-half/cloudlibc/src/libc/unistd/pread.c
new file mode 100644
index 0000000..c9944bc
--- /dev/null
+++ b/libc-bottom-half/cloudlibc/src/libc/unistd/pread.c
@@ -0,0 +1,31 @@
+// Copyright (c) 2015-2016 Nuxi, https://nuxi.nl/
+//
+// SPDX-License-Identifier: BSD-2-Clause
+
+#include <wasi/api.h>
+#include <errno.h>
+#include <unistd.h>
+
+ssize_t pread(int fildes, void *buf, size_t nbyte, off_t offset) {
+  if (offset < 0) {
+    errno = EINVAL;
+    return -1;
+  }
+  __wasi_iovec_t iov = {.buf = buf, .buf_len = nbyte};
+  size_t bytes_read;
+  __wasi_errno_t error =
+      __wasi_fd_pread(fildes, &iov, 1, offset, &bytes_read);
+  if (error != 0) {
+    __wasi_fdstat_t fds;
+    if (error == ENOTCAPABLE && __wasi_fd_fdstat_get(fildes, &fds) == 0) {
+      // Determine why we got ENOTCAPABLE.
+      if ((fds.fs_rights_base & __WASI_RIGHTS_FD_READ) == 0)
+        error = EBADF;
+      else
+        error = ESPIPE;
+    }
+    errno = error;
+    return -1;
+  }
+  return bytes_read;
+}