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LibCore: Define and use a fallible, OS-independent getgrent(_r) wrapper

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Rather than maintaining a list of #ifdef guards to check systems that do
not provide the reentrant version of getgrent, we can use C++ concepts
to let the compiler perform this check for us.

While we're at it, we can also provide this wrapper as fallible to let
the caller TRY calling it.
This commit is contained in:
Timothy Flynn 2022-12-13 15:08:58 -05:00 • committed by Tim Flynn
parent 1ee808fae6
commit d09266237d
3 changed files with 61 additions and 31 deletions
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Userland/Libraries/LibCore/System.h
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@ -126,6 +126,7 @@ ErrorOr<Optional<struct passwd>> getpwent(Span<char> buffer);
ErrorOr<Optional<struct passwd>> getpwnam(StringView name);
ErrorOr<Optional<struct group>> getgrnam(StringView name);
ErrorOr<Optional<struct passwd>> getpwuid(uid_t);
ErrorOr<Optional<struct group>> getgrent(Span<char> buffer);
ErrorOr<Optional<struct group>> getgrgid(gid_t);
ErrorOr<void> clock_settime(clockid_t clock_id, struct timespec* ts);
ErrorOr<pid_t> posix_spawn(StringView path, posix_spawn_file_actions_t const* file_actions, posix_spawnattr_t const* attr, char* const arguments[], char* const envp[]);