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LibCore: Define and use a fallible, OS-independent getpwent(_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 getpwent, 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 14:49:32 -05:00 • committed by Tim Flynn
parent b367da592c
commit 1ee808fae6
3 changed files with 58 additions and 27 deletions
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Userland/Libraries/LibCore/System.h
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@ -122,6 +122,7 @@ ErrorOr<int> tcsetpgrp(int fd, pid_t pgrp);
ErrorOr<void> chmod(StringView pathname, mode_t mode);
ErrorOr<void> lchown(StringView pathname, uid_t uid, gid_t gid);
ErrorOr<void> chown(StringView pathname, uid_t uid, gid_t gid);
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);