third_party/ulib/musl/src/stdio/fgetc.c

#include "stdio_impl.h"

int fgetc(FILE* f) {
    int c;
    if (atomic_load(&f->lock) < 0 || !__lockfile(f))
        return getc_unlocked(f);
    c = getc_unlocked(f);
    __unlockfile(f);
    return c;
}