xref: /freebsd-11-stable/lib/libc/include/libc_private.h

/*
 * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>.
 * 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.
 * 3. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 * $FreeBSD: head/lib/libc/include/libc_private.h 234657 2012-04-24 17:51:36Z kib $
 *
 * Private definitions for libc, libc_r and libpthread.
 *
 */

#ifndef _LIBC_PRIVATE_H_
#define _LIBC_PRIVATE_H_
#include <sys/_pthreadtypes.h>

/*
 * This global flag is non-zero when a process has created one
 * or more threads. It is used to avoid calling locking functions
 * when they are not required.
 */
extern int	__isthreaded;

/*
 * Elf_Auxinfo *__elf_aux_vector, the pointer to the ELF aux vector
 * provided by kernel. Either set for us by rtld, or found at runtime
 * on stack for static binaries.
 *
 * Type is void to avoid polluting whole libc with ELF types.
 */
extern void	*__elf_aux_vector;

/*
 * libc should use libc_dlopen internally, which respects a global
 * flag where loading of new shared objects can be restricted.
 */
void *libc_dlopen(const char *, int);

/*
 * For dynamic linker.
 */
void _rtld_error(const char *fmt, ...);

/*
 * File lock contention is difficult to diagnose without knowing
 * where locks were set. Allow a debug library to be built which
 * records the source file and line number of each lock call.
 */
#ifdef	_FLOCK_DEBUG
#define _FLOCKFILE(x)	_flockfile_debug(x, __FILE__, __LINE__)
#else
#define _FLOCKFILE(x)	_flockfile(x)
#endif

/*
 * Macros for locking and unlocking FILEs. These test if the
 * process is threaded to avoid locking when not required.
 */
#define	FLOCKFILE(fp)		if (__isthreaded) _FLOCKFILE(fp)
#define	FUNLOCKFILE(fp)		if (__isthreaded) _funlockfile(fp)

struct _spinlock;
extern struct _spinlock __stdio_thread_lock;
#define STDIO_THREAD_LOCK()				\
do {							\
	if (__isthreaded)				\
		_SPINLOCK(&__stdio_thread_lock);	\
} while (0)
#define STDIO_THREAD_UNLOCK()				\
do {							\
	if (__isthreaded)				\
		_SPINUNLOCK(&__stdio_thread_lock);	\
} while (0)

/*
 * Indexes into the pthread jump table.
 *
 * Warning! If you change this type, you must also change the threads
 * libraries that reference it (libc_r, libpthread).
 */
typedef enum {
	PJT_ATFORK,
	PJT_ATTR_DESTROY,
	PJT_ATTR_GETDETACHSTATE,
	PJT_ATTR_GETGUARDSIZE,
	PJT_ATTR_GETINHERITSCHED,
	PJT_ATTR_GETSCHEDPARAM,
	PJT_ATTR_GETSCHEDPOLICY,
	PJT_ATTR_GETSCOPE,
	PJT_ATTR_GETSTACKADDR,
	PJT_ATTR_GETSTACKSIZE,
	PJT_ATTR_INIT,
	PJT_ATTR_SETDETACHSTATE,
	PJT_ATTR_SETGUARDSIZE,
	PJT_ATTR_SETINHERITSCHED,
	PJT_ATTR_SETSCHEDPARAM,
	PJT_ATTR_SETSCHEDPOLICY,
	PJT_ATTR_SETSCOPE,
	PJT_ATTR_SETSTACKADDR,
	PJT_ATTR_SETSTACKSIZE,
	PJT_CANCEL,
	PJT_CLEANUP_POP,
	PJT_CLEANUP_PUSH,
	PJT_COND_BROADCAST,
	PJT_COND_DESTROY,
	PJT_COND_INIT,
	PJT_COND_SIGNAL,
	PJT_COND_TIMEDWAIT,
	PJT_COND_WAIT,
	PJT_DETACH,
	PJT_EQUAL,
	PJT_EXIT,
	PJT_GETSPECIFIC,
	PJT_JOIN,
	PJT_KEY_CREATE,
	PJT_KEY_DELETE,
	PJT_KILL,
	PJT_MAIN_NP,
	PJT_MUTEXATTR_DESTROY,
	PJT_MUTEXATTR_INIT,
	PJT_MUTEXATTR_SETTYPE,
	PJT_MUTEX_DESTROY,
	PJT_MUTEX_INIT,
	PJT_MUTEX_LOCK,
	PJT_MUTEX_TRYLOCK,
	PJT_MUTEX_UNLOCK,
	PJT_ONCE,
	PJT_RWLOCK_DESTROY,
	PJT_RWLOCK_INIT,
	PJT_RWLOCK_RDLOCK,
	PJT_RWLOCK_TRYRDLOCK,
	PJT_RWLOCK_TRYWRLOCK,
	PJT_RWLOCK_UNLOCK,
	PJT_RWLOCK_WRLOCK,
	PJT_SELF,
	PJT_SETCANCELSTATE,
	PJT_SETCANCELTYPE,
	PJT_SETSPECIFIC,
	PJT_SIGMASK,
	PJT_TESTCANCEL,
	PJT_CLEANUP_POP_IMP,
	PJT_CLEANUP_PUSH_IMP,
	PJT_CANCEL_ENTER,
	PJT_CANCEL_LEAVE,
	PJT_MAX
} pjt_index_t;

typedef int (*pthread_func_t)(void);
typedef pthread_func_t pthread_func_entry_t[2];

extern pthread_func_entry_t __thr_jtable[];

/*
 * yplib internal interfaces
 */
#ifdef YP
int _yp_check(char **);
#endif

/*
 * Initialise TLS for static programs
 */
void _init_tls(void);

/*
 * Provides pthread_once()-like functionality for both single-threaded
 * and multi-threaded applications.
 */
int _once(pthread_once_t *, void (*)(void));

/*
 * Set the TLS thread pointer
 */
void _set_tp(void *tp);

/*
 * This is a pointer in the C run-time startup code. It is used
 * by getprogname() and setprogname().
 */
extern const char *__progname;

/*
 * This function is used by the threading libraries to notify malloc that a
 * thread is exiting.
 */
void _malloc_thread_cleanup(void);

/*
 * These functions are used by the threading libraries in order to protect
 * malloc across fork().
 */
void _malloc_prefork(void);
void _malloc_postfork(void);

/*
 * Function to clean up streams, called from abort() and exit().
 */
extern void (*__cleanup)(void);

/*
 * Get kern.osreldate to detect ABI revisions.  Explicitly
 * ignores value of $OSVERSION and caches result.  Prototypes
 * for the wrapped "new" pad-less syscalls are here for now.
 */
extern int __getosreldate(void);
#include <sys/_types.h>
/* Without pad */
extern __off_t	__sys_lseek(int, __off_t, int);
extern int	__sys_ftruncate(int, __off_t);
extern int	__sys_truncate(const char *, __off_t);
extern __ssize_t __sys_pread(int, void *, __size_t, __off_t);
extern __ssize_t __sys_pwrite(int, const void *, __size_t, __off_t);
extern void *	__sys_mmap(void *, __size_t, int, int, int, __off_t);

/* With pad */
extern __off_t	__sys_freebsd6_lseek(int, int, __off_t, int);
extern int	__sys_freebsd6_ftruncate(int, int, __off_t);
extern int	__sys_freebsd6_truncate(const char *, int, __off_t);
extern __ssize_t __sys_freebsd6_pread(int, void *, __size_t, int, __off_t);
extern __ssize_t __sys_freebsd6_pwrite(int, const void *, __size_t, int, __off_t);
extern void *	__sys_freebsd6_mmap(void *, __size_t, int, int, int, int, __off_t);

/* Without back-compat translation */
extern int	__sys_fcntl(int, int, ...);

/* execve() with PATH processing to implement posix_spawnp() */
int _execvpe(const char *, char * const *, char * const *);

int _elf_aux_info(int aux, void *buf, int buflen);
struct dl_phdr_info;
int __elf_phdr_match_addr(struct dl_phdr_info *, void *);
void __init_elf_aux_vector(void);

void	_pthread_cancel_enter(int);
void	_pthread_cancel_leave(int);

#endif /* _LIBC_PRIVATE_H_ */