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LibCore: Add Core::System::readlink

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This commit is contained in:
Peter Elliott 2022-10-24 22:15:58 -06:00 • committed by Linus Groh
parent 612a3324d7
commit 415eb17490
2 changed files with 22 additions and 0 deletions
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21
Userland/Libraries/LibCore/System.cpp
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@ -1326,4 +1326,25 @@ ErrorOr<void> access(StringView pathname, int mode)
#endif
}
ErrorOr<String> readlink(StringView pathname)
{
// FIXME: Try again with a larger buffer.
char data[PATH_MAX];
#ifdef AK_OS_SERENITY
Syscall::SC_readlink_params small_params {
{ pathname.characters_without_null_termination(), pathname.length() },
{ data, sizeof(data) }
};
int rc = syscall(SC_readlink, &small_params);
HANDLE_SYSCALL_RETURN_VALUE("readlink", rc, String(data, rc));
#else
String path_string = pathname;
int rc = ::readlink(path_string.characters(), data, sizeof(data));
if (rc == -1)
return Error::from_syscall("readlink"sv, -errno);
return String(data, rc);
#endif
}
}