/* Common extra functions.

   Copyright (C) 2016-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library 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.

   The GNU C Library 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 the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

/* This header file should only contain definitions compatible with

   C90.  (Using __attribute__ is fine because <features.h> provides a

   fallback.)  */

#ifndef SUPPORT_H

#define SUPPORT_H

#include <stddef.h>

#include <sys/cdefs.h>

/* For mode_t.  */

#include <sys/stat.h>

/* For ssize_t and off64_t.  */

#include <sys/types.h>

__BEGIN_DECLS

/* Write a message to standard output.  Can be used in signal

   handlers.  */

void write_message (const char *message) __attribute__ ((nonnull (1)));

/* Avoid all the buffer overflow messages on stderr.  */

void ignore_stderr (void);

/* Set fortification error handler.  Used when tests want to verify that bad

   code is caught by the library.  */

void set_fortify_handler (void (*handler) (int sig));

/* Report an out-of-memory error for the allocation of SIZE bytes in

   FUNCTION, terminating the process.  */

void oom_error (const char *function, size_t size)

  __attribute__ ((nonnull (1)));

/* Return a pointer to a memory region of SIZE bytes.  The memory is

   initialized to zero and will be shared with subprocesses (across

   fork).  The returned pointer must be freed using

   support_shared_free; it is not compatible with the malloc

   functions.  */

void *support_shared_allocate (size_t size);

/* Deallocate a pointer returned by support_shared_allocate.  */

void support_shared_free (void *);

/* Write CONTENTS to the file PATH.  Create or truncate the file as

   needed.  The file mode is 0666 masked by the umask.  Terminate the

   process on error.  */

void support_write_file_string (const char *path, const char *contents);

/* Quote the contents of the byte array starting at BLOB, of LENGTH

   bytes, in such a way that the result string can be included in a C

   literal (in single/double quotes, without putting the quotes into

   the result).  */

char *support_quote_blob (const void *blob, size_t length);

/* Quote the contents of the string, in such a way that the result

   string can be included in a C literal (in single/double quotes,

   without putting the quotes into the result).  */

char *support_quote_string (const char *);

/* Returns non-zero if the file descriptor is a regular file on a file

   system which supports holes (that is, seeking and writing does not

   allocate storage for the range of zeros).  FD must refer to a

   regular file open for writing, and initially empty.  */

int support_descriptor_supports_holes (int fd);

/* Error-checking wrapper functions which terminate the process on

   error.  */

void *xmalloc (size_t) __attribute__ ((malloc));

void *xcalloc (size_t n, size_t s) __attribute__ ((malloc));

void *xrealloc (void *p, size_t n);

void *xposix_memalign (size_t alignment, size_t n);

char *xasprintf (const char *format, ...)

  __attribute__ ((format (printf, 1, 2), malloc));

char *xstrdup (const char *);

char *xstrndup (const char *, size_t);

/* These point to the TOP of the source/build tree, not your (or

   support's) subdirectory.  */

extern const char support_srcdir_root[];

extern const char support_objdir_root[];

/* Corresponds to the path to the runtime linker used by the testsuite,

   e.g. OBJDIR_PATH/elf/ld-linux-x86-64.so.2  */

extern const char support_objdir_elf_ldso[];

/* Corresponds to the --prefix= passed to configure.  */

extern const char support_install_prefix[];

/* Corresponds to the install's lib/ or lib64/ directory.  */

extern const char support_libdir_prefix[];

/* Corresponds to the install's bin/ directory.  */

extern const char support_bindir_prefix[];

/* Corresponds to the install's sbin/ directory.  */

extern const char support_install_rootsbindir[];

extern ssize_t support_copy_file_range (int, off64_t *, int, off64_t *,

					size_t, unsigned int);

__END_DECLS

#endif /* SUPPORT_H */