third_party/ulib/musl/src/mman/posix_madvise.c

#define _GNU_SOURCE
#include <errno.h>
#include <sys/mman.h>

int posix_madvise(void* addr, size_t len, int advice) {
    if (advice == MADV_DONTNEED)
        return 0;
    errno = ENOSYS;
    return -1;
}