117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
/* Using NaCl interface tables.
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Copyright (C) 2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _NACL_INTERFACES_H
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#define _NACL_INTERFACES_H 1
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#include <errno.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <sys/types.h>
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/* <nacl-irt.h> is massaged from native_client/src/untrusted/irt/irt.h so
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that it uses nacl_abi_*_t type names. We must define those types first. */
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/* These are the same in the IRT ABI as in the libc ABI. */
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typedef blksize_t nacl_abi_blksize_t;
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typedef dev_t nacl_abi_dev_t;
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typedef gid_t nacl_abi_gid_t;
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typedef ino_t nacl_abi_ino_t;
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typedef mode_t nacl_abi_mode_t;
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typedef nlink_t nacl_abi_nlink_t;
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typedef size_t nacl_abi_size_t;
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typedef time_t nacl_abi_time_t;
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typedef uid_t nacl_abi_uid_t;
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typedef struct dirent nacl_abi_dirent_t;
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typedef struct timeval nacl_abi_timeval_t;
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typedef struct timespec nacl_abi_timespec_t;
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/* This is unsigned in the IRT ABI, but it's traditionally 'long int',
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so we stick with that. */
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typedef clock_t nacl_abi_clock_t;
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typedef int32_t nacl_abi_blkcnt_t;
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/* This is different by design. */
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typedef struct nacl_abi_stat nacl_abi_stat_t;
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#include <nacl-irt.h>
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/* This is how we access the IRT interface-query function.
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This formulation makes it usable as if it were a function name. */
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#define __nacl_irt_query (*(TYPE_nacl_irt_query) GLRO(dl_sysinfo))
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/* This describes one IRT (or IRT-like) interface that libc uses.
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This structure contains no pointers, so it can go into rodata
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without relocs. Instead, the actual tables we use for these
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interfaces live in a parallel section in writable data. */
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struct nacl_interface {
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size_t table_size;
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size_t namelen;
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char name[];
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};
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/* Increment for 'const struct nacl_interface *' pointers. */
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static inline const struct nacl_interface *
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next_nacl_interface (const struct nacl_interface *i)
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{
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uintptr_t align = __alignof (*i);
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return (const void *) (((uintptr_t) &i->name[i->namelen] + align - 1)
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& -align);
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}
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#if IS_IN (libpthread)
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# define libpthread_hidden_proto(name) hidden_proto (name)
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#else
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# define libpthread_hidden_proto(name)
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#endif
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#define DECLARE_INTERFACE(module, type) \
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extern struct type __##type; module##_hidden_proto (__##type);
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#define NACL_MANDATORY_INTERFACE(module, id, type) \
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DECLARE_INTERFACE (module, type)
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#define NACL_OPTIONAL_INTERFACE(module, id, type) \
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DECLARE_INTERFACE (module, type)
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#include "nacl-interface-list.h"
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#undef NACL_MANDATORY_INTERFACE
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#undef NACL_OPTIONAL_INTERFACE
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extern void __nacl_initialize_interfaces (void) attribute_hidden;
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extern bool __nacl_supply_interface_libc (const char *ident, size_t ident_len,
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const void *table, size_t tablesize)
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internal_function attribute_hidden;
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extern bool __nacl_supply_interface_rtld (const char *ident, size_t ident_len,
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const void *table, size_t tablesize);
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internal_function;
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/* Convenience function for handling IRT call return values. */
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static inline int
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__nacl_fail (int err)
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{
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errno = err;
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return -1;
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}
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#define NACL_CALL(err, val) \
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({ int _err = (err); _err ? __nacl_fail (_err) : (val); })
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#endif /* nacl-interfaces.h */
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