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/* 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>
__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);
/* 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);
char *xasprintf (const char *format, ...)
__attribute__ ((format (printf, 1, 2), malloc));
char *xstrdup (const char *);
char *xstrndup (const char *, size_t);
__END_DECLS
#endif /* SUPPORT_H */
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