[libc-commits] [libc] [libc][POSIX][unistd] Implement gethostname (PR #128142)

[Zaky Hermawan via libc-commits]

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@@ -0,0 +1,53 @@
+//===-- Linux implementation of gethostname -------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/unistd/gethostname.h"
+
+#include "hdr/types/size_t.h"
+#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/common.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/macros/config.h"
+#include "src/string/string_utils.h"
+
+#include <sys/syscall.h> // For syscall numbers.
+#include <sys/utsname.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, gethostname, (char *name, size_t size)) {
+  // Check for invalid pointer
+  if (name == nullptr) {
+    libc_errno = EFAULT;
+    return -1;
+  }
+
+  // Because there is no SYS_gethostname syscall, we use uname to get the
+  // hostname.
+  struct utsname unameData;
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ZakyHermawan wrote:

I think so, because we need to call uname,
https://github.com/llvm/llvm-project/pull/128142#discussion_r1966421485

https://github.com/llvm/llvm-project/pull/128142