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//===-- 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.
utsname unameData;
int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_uname, &unameData);
if (ret < 0) {
libc_errno = static_cast<int>(-ret);
return -1;
}
// Guarantee that the name will be null terminated.
// The amount of bytes copied is min(size + 1, strlen(nodename) + 1)
// +1 to account for the null terminator (the last copied byte is a NULL).
internal::strlcpy(name, unameData.nodename, size + 1);
// Checks if the length of the hostname was greater than or equal to size
if (internal::string_length(unameData.nodename) >= size) {
libc_errno = ENAMETOOLONG;
return -1;
}
return 0;
}
} // namespace LIBC_NAMESPACE_DECL
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