2 * wrappers around low-level operations to provide a simpler interface
3 * to the operations that Lisp needs
5 * The functions in this file are typically called directly from Lisp.
6 * Thus, when their signature changes, they don't need updates in a .h
7 * file somewhere, but they do need updates in the Lisp code. FIXME:
8 * It would be nice to enforce this at compile time. It mighn't even
9 * be all that hard: make the cross-compiler versions of DEFINE-ALIEN-FOO
10 * macros accumulate strings in a list which then gets written out at
11 * the end of sbcl2.h at the end of cross-compilation, then rerun
12 * 'make' in src/runtime/ using the new sbcl2.h as sbcl.h (and make
13 * sure that all the files in src/runtime/ include sbcl.h). */
16 * This software is part of the SBCL system. See the README file for
19 * This software is derived from the CMU CL system, which was
20 * written at Carnegie Mellon University and released into the
21 * public domain. The software is in the public domain and is
22 * provided with absolutely no warranty. See the COPYING and CREDITS
23 * files for more information.
26 #include <sys/types.h>
40 * stuff needed by CL:DIRECTORY and other Lisp directory operations
43 /* Unix directory operations think of "." and ".." as filenames, but
44 * Lisp directory operations do not. */
46 is_lispy_filename(const char *filename)
48 return strcmp(filename, ".") && strcmp(filename, "..");
51 /* Return a zero-terminated array of strings holding the Lispy filenames
52 * (i.e. excluding the Unix magic "." and "..") in the named directory. */
54 alloc_directory_lispy_filenames(const char *directory_name)
56 DIR *dir_ptr = opendir(directory_name);
59 if (dir_ptr) { /* if opendir success */
63 if (0 == voidacc_ctor(&va)) { /* if voidacc_ctor success */
64 struct dirent *dirent_ptr;
66 while ( (dirent_ptr = readdir(dir_ptr)) ) { /* until end of data */
67 char* original_name = dirent_ptr->d_name;
68 if (is_lispy_filename(original_name)) {
69 /* strdup(3) is in Linux and *BSD. If you port
70 * somewhere else that doesn't have it, it's easy
72 char* dup_name = strdup(original_name);
73 if (!dup_name) { /* if strdup failure */
76 if (voidacc_acc(&va, dup_name)) { /* if acc failure */
81 result = (char**)voidacc_give_away_result(&va);
86 /* ignoring closedir(3) return code, since what could we do?
88 * "Never ask questions you don't want to know the answer to."
89 * -- William Irving Zumwalt (Rich Cook, _The Wizardry Quested_) */
96 /* Free a result returned by alloc_directory_lispy_filenames(). */
98 free_directory_lispy_filenames(char** directory_lispy_filenames)
102 /* Free the strings. */
103 for (p = directory_lispy_filenames; *p; ++p) {
107 /* Free the table of strings. */
108 free(directory_lispy_filenames);
115 /* a wrapped version of readlink(2):
116 * -- If path isn't a symlink, or is a broken symlink, return 0.
117 * -- If path is a symlink, return a newly allocated string holding
118 * the thing it's linked to. */
120 wrapped_readlink(char *path)
122 int bufsiz = strlen(path) + 16;
124 char *result = malloc(bufsiz);
125 int n_read = readlink(path, result, n_read);
129 } else if (n_read < bufsiz) {
143 /* As of 0.6.12, the FFI can't handle 64-bit values. For now, we use
144 * these munged-to-32-bits values for might-be-64-bit slots of
145 * stat_wrapper as a workaround, so that at least we can still work
146 * when values are small.
148 * FIXME: But of course we should fix the FFI so that we can use the
149 * actual 64-bit values instead. */
150 typedef long ffi_dev_t; /* since Linux dev_t can be 64 bits */
151 typedef u32 ffi_off_t; /* since OpenBSD 2.8 st_size is 64 bits */
153 /* a representation of stat(2) results which doesn't depend on CPU or OS */
154 struct stat_wrapper {
155 /* KLUDGE: The verbose wrapped_st_ prefixes are to protect us from
156 * the C preprocessor as wielded by the fiends of OpenBSD, who do
158 * #define st_atime st_atimespec.tv_sec
159 * I remember when I was young and innocent, I read about how the
160 * C preprocessor isn't to be used to globally munge random
161 * lowercase symbols like this, because things like this could
162 * happen, and I nodded sagely. But now I know better.:-| This is
163 * another entry for Dan Barlow's ongoing episodic rant about C
164 * header files, I guess.. -- WHN 2001-05-10 */
165 ffi_dev_t wrapped_st_dev; /* device */
166 ino_t wrapped_st_ino; /* inode */
167 mode_t wrapped_st_mode; /* protection */
168 nlink_t wrapped_st_nlink; /* number of hard links */
169 uid_t wrapped_st_uid; /* user ID of owner */
170 gid_t wrapped_st_gid; /* group ID of owner */
171 ffi_dev_t wrapped_st_rdev; /* device type (if inode device) */
172 ffi_off_t wrapped_st_size; /* total size, in bytes */
173 unsigned long wrapped_st_blksize; /* blocksize for filesystem I/O */
174 unsigned long wrapped_st_blocks; /* number of blocks allocated */
175 time_t wrapped_st_atime; /* time_t of last access */
176 time_t wrapped_st_mtime; /* time_t of last modification */
177 time_t wrapped_st_ctime; /* time_t of last change */
181 copy_to_stat_wrapper(struct stat_wrapper *to, struct stat *from)
183 #define FROB(stem) to->wrapped_st_##stem = from->st_##stem
201 stat_wrapper(const char *file_name, struct stat_wrapper *buf)
203 struct stat real_buf;
205 if ((ret = stat(file_name,&real_buf)) >= 0)
206 copy_to_stat_wrapper(buf, &real_buf);
211 lstat_wrapper(const char *file_name, struct stat_wrapper *buf)
213 struct stat real_buf;
215 if ((ret = lstat(file_name,&real_buf)) >= 0)
216 copy_to_stat_wrapper(buf, &real_buf);
221 fstat_wrapper(int filedes, struct stat_wrapper *buf)
223 struct stat real_buf;
225 if ((ret = fstat(filedes,&real_buf)) >= 0)
226 copy_to_stat_wrapper(buf, &real_buf);
234 /* Return a newly-allocated string holding the username for "uid", or
235 * NULL if there's no such user.
237 * KLUDGE: We also return NULL if malloc() runs out of memory
238 * (returning strdup() result) since it's not clear how to handle that
239 * error better. -- WHN 2001-12-28 */
241 uid_username(int uid)
243 struct passwd *p = getpwuid(uid);
245 /* The object *p is a static struct which'll be overwritten by
246 * the next call to getpwuid(), so it'd be unsafe to return
247 * p->pw_name without copying. */
248 return strdup(p->pw_name);