2 * Copyright (C) 2004-2007, 2009, 2011, 2012 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 2000, 2001 Internet Software Consortium.
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
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11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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23 /*! \file isc/file.h */
29 #include <isc/types.h>
34 isc_file_settime(const char *file, isc_time_t *time);
37 isc_file_mode(const char *file, mode_t *modep);
40 isc_file_getmodtime(const char *file, isc_time_t *time);
42 * \brief Get the time of last modification of a file.
45 *\li The time that is set is relative to the (OS-specific) epoch, as are
46 * all isc_time_t structures.
53 *\li If the file could not be accessed, 'time' is unchanged.
59 * No such file exists.
60 *\li #ISC_R_INVALIDFILE
61 * The path specified was not usable by the operating system.
63 * The file's metainformation could not be retrieved because
64 * permission was denied to some part of the file's path.
66 * Hardware error interacting with the filesystem.
67 *\li #ISC_R_UNEXPECTED
68 * Something totally unexpected happened.
73 isc_file_mktemplate(const char *path, char *buf, size_t buflen);
75 * \brief Generate a template string suitable for use with isc_file_openunique().
78 *\li This function is intended to make creating temporary files
79 * portable between different operating systems.
81 *\li The path is prepended to an implementation-defined string and
82 * placed into buf. The string has no path characters in it,
83 * and its maximum length is 14 characters plus a NUL. Thus
84 * buflen should be at least strlen(path) + 15 characters or
85 * an error will be returned.
91 *\li If result == #ISC_R_SUCCESS:
92 * buf contains a string suitable for use as the template argument
93 * to isc_file_openunique().
95 *\li If result != #ISC_R_SUCCESS:
99 *\li #ISC_R_SUCCESS Success.
100 *\li #ISC_R_NOSPACE buflen indicates buf is too small for the catenation
101 * of the path with the internal template string.
105 isc_file_openunique(char *templet, FILE **fp);
107 isc_file_openuniqueprivate(char *templet, FILE **fp);
109 isc_file_openuniquemode(char *templet, int mode, FILE **fp);
111 isc_file_bopenunique(char *templet, FILE **fp);
113 isc_file_bopenuniqueprivate(char *templet, FILE **fp);
115 isc_file_bopenuniquemode(char *templet, int mode, FILE **fp);
117 * \brief Create and open a file with a unique name based on 'templet'.
118 * isc_file_bopen*() open the file in binary mode in Windows.
119 * isc_file_open*() open the file in text mode in Windows.
122 *\li 'template' is a reserved work in C++. If you want to complain
123 * about the spelling of 'templet', first look it up in the
124 * Merriam-Webster English dictionary. (http://www.m-w.com/)
126 *\li This function works by using the template to generate file names.
127 * The template must be a writable string, as it is modified in place.
128 * Trailing X characters in the file name (full file name on Unix,
129 * basename on Win32 -- eg, tmp-XXXXXX vs XXXXXX.tmp, respectively)
130 * are replaced with ASCII characters until a non-existent filename
131 * is found. If the template does not include pathname information,
132 * the files in the working directory of the program are searched.
134 *\li isc_file_mktemplate is a good, portable way to get a template.
137 *\li 'fp' is non-NULL and '*fp' is NULL.
139 *\li 'template' is non-NULL, and of a form suitable for use by
140 * the system as described above.
143 *\li If result is #ISC_R_SUCCESS:
144 * *fp points to an stream opening in stdio's "w+" mode.
146 *\li If result is not #ISC_R_SUCCESS:
149 * No file is open. Even if one was created (but unable
150 * to be reopened as a stdio FILE pointer) then it has been
153 *\li This function does *not* ensure that the template string has not been
154 * modified, even if the operation was unsuccessful.
160 * No file with a unique name could be created based on the
162 *\li #ISC_R_INVALIDFILE
163 * The path specified was not usable by the operating system.
165 * The file could not be created because permission was denied
166 * to some part of the file's path.
168 * Hardware error interacting with the filesystem.
169 *\li #ISC_R_UNEXPECTED
170 * Something totally unexpected happened.
174 isc_file_remove(const char *filename);
176 * \brief Remove the file named by 'filename'.
180 isc_file_rename(const char *oldname, const char *newname);
182 * \brief Rename the file 'oldname' to 'newname'.
186 isc_file_exists(const char *pathname);
188 * \brief Return #ISC_TRUE if the calling process can tell that the given file exists.
189 * Will not return true if the calling process has insufficient privileges
190 * to search the entire path.
194 isc_file_isabsolute(const char *filename);
196 * \brief Return #ISC_TRUE if the given file name is absolute.
200 isc_file_isplainfile(const char *name);
202 * \brief Check that the file is a plain file
206 * Success. The file is a plain file.
207 *\li #ISC_R_INVALIDFILE
208 * The path specified was not usable by the operating system.
209 *\li #ISC_R_FILENOTFOUND
210 * The file does not exist. This return code comes from
211 * errno=ENOENT when stat returns -1. This code is mentioned
212 * here, because in logconf.c, it is the one rcode that is
213 * permitted in addition to ISC_R_SUCCESS. This is done since
214 * the next call in logconf.c is to isc_stdio_open(), which
215 * will create the file if it can.
216 *\li #other ISC_R_* errors translated from errno
217 * These occur when stat returns -1 and an errno.
221 isc_file_iscurrentdir(const char *filename);
223 * \brief Return #ISC_TRUE if the given file name is the current directory (".").
227 isc_file_ischdiridempotent(const char *filename);
229 * Return #ISC_TRUE if calling chdir(filename) multiple times will give
230 * the same result as calling it once.
234 isc_file_basename(const char *filename);
236 * Return the final component of the path in the file name.
240 isc_file_progname(const char *filename, char *buf, size_t buflen);
242 * \brief Given an operating system specific file name "filename"
243 * referring to a program, return the canonical program name.
246 * Any directory prefix or executable file name extension (if
247 * used on the OS in case) is stripped. On systems where program
248 * names are case insensitive, the name is canonicalized to all
249 * lower case. The name is written to 'buf', an array of 'buflen'
250 * chars, and null terminated.
254 *\li #ISC_R_NOSPACE The name did not fit in 'buf'.
258 isc_file_template(const char *path, const char *templet, char *buf,
261 * Create an OS specific template using 'path' to define the directory
262 * 'templet' to describe the filename and store the result in 'buf'
263 * such that path can be renamed to buf atomically.
267 isc_file_renameunique(const char *file, char *templet);
269 * Rename 'file' using 'templet' as a template for the new file name.
273 isc_file_absolutepath(const char *filename, char *path, size_t pathlen);
275 * Given a file name, return the fully qualified path to the file.
279 * XXX We should also have a isc_file_writeeopen() function
280 * for safely open a file in a publicly writable directory
281 * (see write_open() in BIND 8's ns_config.c).
285 isc_file_truncate(const char *filename, isc_offset_t size);
287 * Truncate/extend the file specified to 'size' bytes.
291 isc_file_safecreate(const char *filename, FILE **fp);
293 * Open 'filename' for writing, truncating if necessary. Ensure that
294 * if it existed it was a normal file. If creating the file, ensure
295 * that only the owner can read/write it.
299 isc_file_splitpath(isc_mem_t *mctx, char *path,
300 char **dirname, char **basename);
302 * Split a path into dirname and basename. If 'path' contains no slash
303 * (or, on windows, backslash), then '*dirname' is set to ".".
305 * Allocates memory for '*dirname', which can be freed with isc_mem_free().
308 * - ISC_R_SUCCESS on success
309 * - ISC_R_INVALIDFILE if 'path' is empty or ends with '/'
310 * - ISC_R_NOMEMORY if unable to allocate memory
315 #endif /* ISC_FILE_H */