/* * walk_nss.h * NSS walking template for nss_nonlocal proxy * * Copyright © 2011 Anders Kaseorg and Tim Abbott * * * This file is part of nss_nonlocal. * * nss_nonlocal is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * nss_nonlocal is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with nss_nonlocal; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301 USA */ { static bool initialized = false; static service_user *startp; static void *fct_start; service_user *nip; union { __typeof__(self) l; void *ptr; } fct; int old_errno = errno; if (!initialized) { if (w.lookup(&startp, w.fct_name, &fct_start) != 0) { *w.status = NSS_STATUS_UNAVAIL; goto walk_nss_out; } __sync_synchronize(); initialized = true; } nip = startp; fct.ptr = fct_start; if (w.buf != NULL) { *w.buf = malloc(*w.buflen); errno = old_errno; if (*w.buf == NULL) { *w.status = NSS_STATUS_TRYAGAIN; *w.errnop = ENOMEM; goto walk_nss_out; } } do { walk_nss_morebuf: if (fct.ptr == NULL) *w.status = NSS_STATUS_UNAVAIL; else if (self != NULL && fct.l == self) *w.status = NSS_STATUS_NOTFOUND; else *w.status = DL_CALL_FCT(fct.l, args); if (*w.status == NSS_STATUS_TRYAGAIN && w.errnop != NULL && *w.errnop == ERANGE) { if (w.buf == NULL) break; free(*w.buf); *w.buflen *= 2; *w.buf = malloc(*w.buflen); errno = old_errno; if (*w.buf == NULL) { *w.errnop = ENOMEM; goto walk_nss_out; } goto walk_nss_morebuf; } } while (__nss_next(&nip, w.fct_name, &fct.ptr, *w.status, w.all_values) == 0); if (w.buf != NULL && *w.status != NSS_STATUS_SUCCESS) { free(*w.buf); *w.buf = NULL; } walk_nss_out: ; }