third_party/ulib/musl/src/unistd/getlogin_r.c

#include <errno.h>
#include <string.h>
#include <unistd.h>

int getlogin_r(char* name, size_t size) {
    char* logname = getlogin();
    if (!logname)
        return ENXIO; /* or...? */
    if (strlen(logname) >= size)
        return ERANGE;
    strcpy(name, logname);
    return 0;
}