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92954ffa5a
During testing of localedef running in a minimal container there were several error cases which were hard to diagnose since they appeared as strerror (errno) values printed by the higher level functions. This change adds three new verbose messages for potential failure paths. The new messages give the user the opportunity to use -v and display additional information about why localedef might be failing. I found these messages useful myself while writing a localedef container test for --no-hard-links. Since the changes cleanup the code that handle codeset normalization we add tst-localedef-path-norm which contains many sub-tests to verify the correct expected normalization of codeset strings both when installing to default paths (the only time normalization is enabled) and installing to absolute paths. During the refactoring I created at least one buffer-overflow which valgrind caught, but these tests did not catch because the exec in the container had a very clean heap with zero-initialized memory. However, between valgrind and the tests the results are clean. The new tst-localedef-path-norm passes without regression on x86_64. Change-Id: I28b9f680711ff00252a2cb15625b774cc58ecb9d
124 lines
4.8 KiB
C
124 lines
4.8 KiB
C
/* Common extra functions.
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Copyright (C) 2016-2020 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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<https://www.gnu.org/licenses/>. */
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/* This header file should only contain definitions compatible with
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C90. (Using __attribute__ is fine because <features.h> provides a
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fallback.) */
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#ifndef SUPPORT_H
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#define SUPPORT_H
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#include <stddef.h>
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#include <sys/cdefs.h>
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/* For mode_t. */
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#include <sys/stat.h>
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/* For ssize_t and off64_t. */
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#include <sys/types.h>
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__BEGIN_DECLS
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/* Write a message to standard output. Can be used in signal
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handlers. */
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void write_message (const char *message) __attribute__ ((nonnull (1)));
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/* Avoid all the buffer overflow messages on stderr. */
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void ignore_stderr (void);
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/* Set fortification error handler. Used when tests want to verify that bad
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code is caught by the library. */
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void set_fortify_handler (void (*handler) (int sig));
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/* Report an out-of-memory error for the allocation of SIZE bytes in
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FUNCTION, terminating the process. */
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void oom_error (const char *function, size_t size)
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__attribute__ ((nonnull (1)));
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/* Return a pointer to a memory region of SIZE bytes. The memory is
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initialized to zero and will be shared with subprocesses (across
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fork). The returned pointer must be freed using
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support_shared_free; it is not compatible with the malloc
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functions. */
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void *support_shared_allocate (size_t size);
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/* Deallocate a pointer returned by support_shared_allocate. */
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void support_shared_free (void *);
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/* Write CONTENTS to the file PATH. Create or truncate the file as
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needed. The file mode is 0666 masked by the umask. Terminate the
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process on error. */
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void support_write_file_string (const char *path, const char *contents);
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/* Quote the contents of the byte array starting at BLOB, of LENGTH
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bytes, in such a way that the result string can be included in a C
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literal (in single/double quotes, without putting the quotes into
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the result). */
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char *support_quote_blob (const void *blob, size_t length);
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/* Quote the contents of the string, in such a way that the result
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string can be included in a C literal (in single/double quotes,
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without putting the quotes into the result). */
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char *support_quote_string (const char *);
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/* Returns non-zero if the file descriptor is a regular file on a file
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system which supports holes (that is, seeking and writing does not
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allocate storage for the range of zeros). FD must refer to a
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regular file open for writing, and initially empty. */
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int support_descriptor_supports_holes (int fd);
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/* Error-checking wrapper functions which terminate the process on
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error. */
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void *xmalloc (size_t) __attribute__ ((malloc));
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void *xcalloc (size_t n, size_t s) __attribute__ ((malloc));
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void *xrealloc (void *p, size_t n);
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void *xposix_memalign (size_t alignment, size_t n);
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char *xasprintf (const char *format, ...)
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__attribute__ ((format (printf, 1, 2), malloc));
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char *xstrdup (const char *);
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char *xstrndup (const char *, size_t);
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char *xsetlocale (int category, const char *locale);
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/* These point to the TOP of the source/build tree, not your (or
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support's) subdirectory. */
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extern const char support_srcdir_root[];
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extern const char support_objdir_root[];
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/* Corresponds to the path to the runtime linker used by the testsuite,
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e.g. OBJDIR_PATH/elf/ld-linux-x86-64.so.2 */
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extern const char support_objdir_elf_ldso[];
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/* Corresponds to the --prefix= passed to configure. */
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extern const char support_install_prefix[];
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/* Corresponds to the install's lib/ or lib64/ directory. */
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extern const char support_libdir_prefix[];
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/* Corresponds to the install's bin/ directory. */
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extern const char support_bindir_prefix[];
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/* Corresponds to the install's sbin/ directory. */
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extern const char support_sbindir_prefix[];
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/* Corresponds to the install's sbin/ directory (without prefix). */
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extern const char support_install_rootsbindir[];
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/* Corresponds to the install's compiled locale directory. */
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extern const char support_complocaledir_prefix[];
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extern ssize_t support_copy_file_range (int, off64_t *, int, off64_t *,
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size_t, unsigned int);
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__END_DECLS
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#endif /* SUPPORT_H */
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