diff options
Diffstat (limited to 'lib/libc/gen/aux.c')
| -rw-r--r-- | lib/libc/gen/aux.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/lib/libc/gen/aux.c b/lib/libc/gen/aux.c new file mode 100644 index 0000000..4bf8643 --- /dev/null +++ b/lib/libc/gen/aux.c @@ -0,0 +1,171 @@ +/*- + * Copyright 2010, 2012 Konstantin Belousov <kib@FreeBSD.ORG>. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "namespace.h" +#include <elf.h> +#include <errno.h> +#include <link.h> +#include <pthread.h> +#include <string.h> +#include "un-namespace.h" +#include "libc_private.h" + +extern char **environ; +extern int _DYNAMIC; +#pragma weak _DYNAMIC + +void *__elf_aux_vector; +static pthread_once_t aux_vector_once = PTHREAD_ONCE_INIT; + +static void +init_aux_vector_once(void) +{ + Elf_Addr *sp; + + sp = (Elf_Addr *)environ; + while (*sp++ != 0) + ; + __elf_aux_vector = (Elf_Auxinfo *)sp; +} + +void +__init_elf_aux_vector(void) +{ + + if (&_DYNAMIC != NULL) + return; + _once(&aux_vector_once, init_aux_vector_once); +} + +static pthread_once_t aux_once = PTHREAD_ONCE_INIT; +static int pagesize, osreldate, canary_len, ncpus, pagesizes_len; +static char *canary, *pagesizes; + +static void +init_aux(void) +{ + Elf_Auxinfo *aux; + + for (aux = __elf_aux_vector; aux->a_type != AT_NULL; aux++) { + switch (aux->a_type) { + case AT_CANARY: + canary = (char *)(aux->a_un.a_ptr); + break; + + case AT_CANARYLEN: + canary_len = aux->a_un.a_val; + break; + + case AT_PAGESIZES: + pagesizes = (char *)(aux->a_un.a_ptr); + break; + + case AT_PAGESIZESLEN: + pagesizes_len = aux->a_un.a_val; + break; + + case AT_PAGESZ: + pagesize = aux->a_un.a_val; + break; + + case AT_OSRELDATE: + osreldate = aux->a_un.a_val; + break; + + case AT_NCPUS: + ncpus = aux->a_un.a_val; + break; + } + } +} + +int +_elf_aux_info(int aux, void *buf, int buflen) +{ + int res; + + __init_elf_aux_vector(); + if (__elf_aux_vector == NULL) + return (ENOSYS); + _once(&aux_once, init_aux); + + switch (aux) { + case AT_CANARY: + if (canary != NULL && canary_len >= buflen) { + memcpy(buf, canary, buflen); + memset(canary, 0, canary_len); + canary = NULL; + res = 0; + } else + res = ENOENT; + break; + case AT_PAGESIZES: + if (pagesizes != NULL && pagesizes_len >= buflen) { + memcpy(buf, pagesizes, buflen); + res = 0; + } else + res = ENOENT; + break; + + case AT_PAGESZ: + if (buflen == sizeof(int)) { + if (pagesize != 0) { + *(int *)buf = pagesize; + res = 0; + } else + res = ENOENT; + } else + res = EINVAL; + break; + case AT_OSRELDATE: + if (buflen == sizeof(int)) { + if (osreldate != 0) { + *(int *)buf = osreldate; + res = 0; + } else + res = ENOENT; + } else + res = EINVAL; + break; + case AT_NCPUS: + if (buflen == sizeof(int)) { + if (ncpus != 0) { + *(int *)buf = ncpus; + res = 0; + } else + res = ENOENT; + } else + res = EINVAL; + break; + default: + res = ENOENT; + break; + } + return (res); +} |
