2 * wrappers around low-level operations to provide a simpler interface
3 * to the operations that Lisp (and some contributed modules) 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.
28 #include <sys/types.h>
35 #ifndef LISP_FEATURE_WIN32
46 /* Although it might seem as though this should be in some standard
47 Unix header, according to Perry E. Metzger, in a message on
48 sbcl-devel dated 2004-03-29, this is the POSIXly-correct way of
49 using environ: by an explicit declaration. -- CSR, 2004-03-30 */
50 extern char **environ;
53 * stuff needed by CL:DIRECTORY and other Lisp directory operations
56 /* Unix directory operations think of "." and ".." as filenames, but
57 * Lisp directory operations do not. */
59 is_lispy_filename(const char *filename)
61 return strcmp(filename, ".") && strcmp(filename, "..");
64 /* Return a zero-terminated array of strings holding the Lispy filenames
65 * (i.e. excluding the Unix magic "." and "..") in the named directory. */
67 alloc_directory_lispy_filenames(const char *directory_name)
69 DIR *dir_ptr = opendir(directory_name);
72 if (dir_ptr) { /* if opendir success */
76 if (0 == voidacc_ctor(&va)) { /* if voidacc_ctor success */
77 struct dirent *dirent_ptr;
79 while ( (dirent_ptr = readdir(dir_ptr)) ) { /* until end of data */
80 char* original_name = dirent_ptr->d_name;
81 if (is_lispy_filename(original_name)) {
82 /* strdup(3) is in Linux and *BSD. If you port
83 * somewhere else that doesn't have it, it's easy
85 char* dup_name = strdup(original_name);
86 if (!dup_name) { /* if strdup failure */
89 if (voidacc_acc(&va, dup_name)) { /* if acc failure */
94 result = (char**)voidacc_give_away_result(&va);
99 /* ignoring closedir(3) return code, since what could we do?
101 * "Never ask questions you don't want to know the answer to."
102 * -- William Irving Zumwalt (Rich Cook, _The Wizardry Quested_) */
109 /* Free a result returned by alloc_directory_lispy_filenames(). */
111 free_directory_lispy_filenames(char** directory_lispy_filenames)
115 /* Free the strings. */
116 for (p = directory_lispy_filenames; *p; ++p) {
120 /* Free the table of strings. */
121 free(directory_lispy_filenames);
128 #ifndef LISP_FEATURE_WIN32
129 /* a wrapped version of readlink(2):
130 * -- If path isn't a symlink, or is a broken symlink, return 0.
131 * -- If path is a symlink, return a newly allocated string holding
132 * the thing it's linked to. */
134 wrapped_readlink(char *path)
136 int bufsiz = strlen(path) + 16;
138 char *result = malloc(bufsiz);
139 int n_read = readlink(path, result, bufsiz);
143 } else if (n_read < bufsiz) {
159 copy_to_stat_wrapper(struct stat_wrapper *to, struct stat *from)
161 #define FROB(stem) to->wrapped_st_##stem = from->st_##stem
162 #ifndef LISP_FEATURE_WIN32
163 #define FROB2(stem) to->wrapped_st_##stem = from->st_##stem
165 #define FROB2(stem) to->wrapped_st_##stem = 0;
184 stat_wrapper(const char *file_name, struct stat_wrapper *buf)
186 struct stat real_buf;
189 #ifdef LISP_FEATURE_WIN32
191 * Windows won't match the last component of a pathname if there
192 * is a trailing #\/ or #\\, except if it's <drive>:\ or <drive>:/
193 * in which case it behaves the other way around. So we remove the
194 * trailing directory separator unless we are being passed just a
195 * drive name (e.g. "c:\\"). Some, but not all, of this
196 * strangeness is documented at Microsoft's support site (as of
198 * <http://support.microsoft.com/default.aspx?scid=kb;en-us;168439>)
200 char file_buf[MAX_PATH];
201 strcpy(file_buf, file_name);
202 int len = strlen(file_name);
203 if (len != 0 && (file_name[len-1] == '/' || file_name[len-1] == '\\') &&
204 !(len == 3 && file_name[1] == ':' && isalpha(file_name[0])))
205 file_buf[len-1] = '\0';
206 file_name = file_buf;
209 if ((ret = stat(file_name,&real_buf)) >= 0)
210 copy_to_stat_wrapper(buf, &real_buf);
214 #ifndef LISP_FEATURE_WIN32
216 lstat_wrapper(const char *file_name, struct stat_wrapper *buf)
218 struct stat real_buf;
220 if ((ret = lstat(file_name,&real_buf)) >= 0)
221 copy_to_stat_wrapper(buf, &real_buf);
225 /* cleaner to do it here than in Lisp */
226 int lstat_wrapper(const char *file_name, struct stat_wrapper *buf)
228 return stat_wrapper(file_name, buf);
233 fstat_wrapper(int filedes, struct stat_wrapper *buf)
235 struct stat real_buf;
237 if ((ret = fstat(filedes,&real_buf)) >= 0)
238 copy_to_stat_wrapper(buf, &real_buf);
246 #ifndef LISP_FEATURE_WIN32
247 /* Return a newly-allocated string holding the username for "uid", or
248 * NULL if there's no such user.
250 * KLUDGE: We also return NULL if malloc() runs out of memory
251 * (returning strdup() result) since it's not clear how to handle that
252 * error better. -- WHN 2001-12-28 */
254 uid_username(int uid)
256 struct passwd *p = getpwuid(uid);
258 /* The object *p is a static struct which'll be overwritten by
259 * the next call to getpwuid(), so it'd be unsafe to return
260 * p->pw_name without copying. */
261 return strdup(p->pw_name);
268 uid_homedir(uid_t uid)
270 struct passwd *p = getpwuid(uid);
272 /* Let's be careful about this, shall we? */
273 size_t len = strlen(p->pw_dir);
274 if (p->pw_dir[len-1] == '/') {
275 return strdup(p->pw_dir);
277 char *result = malloc(len + 2);
279 int nchars = sprintf(result,"%s/",p->pw_dir);
280 if (nchars == len + 1) {
293 #endif /* !LISP_FEATURE_WIN32 */
296 * functions to get miscellaneous C-level variables
298 * (Doing this by calling functions lets us borrow the smarts of the C
299 * linker, so that things don't blow up when libc versions and thus
300 * variable locations change between compile time and run time.)
309 #ifdef LISP_FEATURE_WIN32
310 #define WIN32_LEAN_AND_MEAN
314 * faked-up implementation of select(). Right now just enough to get through
317 int select(int top_fd, DWORD *read_set, DWORD *write_set, DWORD *except_set, time_t *timeout)
320 * FIXME: Going forward, we may want to use MsgWaitForMultipleObjects
321 * in order to support a windows message loop inside serve-event.
323 HANDLE handles[MAXIMUM_WAIT_OBJECTS];
324 int fds[MAXIMUM_WAIT_OBJECTS];
333 for (i = 0; i < top_fd; i++) {
334 if (except_set) except_set[i >> 5] = 0;
335 if (write_set && (write_set[i >> 5] & (1 << (i & 31)))) polling_write = 1;
336 if (read_set[i >> 5] & (1 << (i & 31))) {
337 read_set[i >> 5] &= ~(1 << (i & 31));
338 fds[num_handles] = i;
339 handles[num_handles++] = (HANDLE) _get_osfhandle(i);
343 win_timeout = INFINITE;
344 if (timeout) win_timeout = (timeout[0] * 1000) + timeout[1];
346 /* Last parameter here is timeout in milliseconds. */
347 /* retval = WaitForMultipleObjects(num_handles, handles, 0, INFINITE); */
348 retval = WaitForMultipleObjects(num_handles, handles, 0, win_timeout);
350 if (retval < WAIT_ABANDONED) {
351 /* retval, at this point, is the index of the single live HANDLE/fd. */
352 read_set[fds[retval] >> 5] |= (1 << (fds[retval] & 31));
355 return polling_write;
359 * Windows doesn't have gettimeofday(), and we need it for the compiler,
360 * for serve-event, and for a couple other things. We don't need a timezone
361 * yet, however, and the closest we can easily get to a timeval is the
362 * seconds part. So that's what we do.
364 int gettimeofday(long *timeval, long *timezone)
366 timeval[0] = time(NULL);
374 /* We will need to define these things or their equivalents for Win32
375 eventually, but for now let's get it working for everyone else. */
376 #ifndef LISP_FEATURE_WIN32
377 /* From SB-BSD-SOCKETS, to get h_errno */
383 /* From SB-POSIX, wait-macros */
384 int wifexited(int status) {
385 return WIFEXITED(status);
387 int wexitstatus(int status) {
388 return WEXITSTATUS(status);
390 int wifsignaled(int status) {
391 return WIFSIGNALED(status);
393 int wtermsig(int status) {
394 return WTERMSIG(status);
396 int wifstopped(int status) {
397 return WIFSTOPPED(status);
399 int wstopsig(int status) {
400 return WSTOPSIG(status);
402 /* FIXME: POSIX also defines WIFCONTINUED, but that appears not to
403 exist on at least Linux... */
404 #endif /* !LISP_FEATURE_WIN32 */
406 /* From SB-POSIX, stat-macros */
407 int s_isreg(mode_t mode)
409 return S_ISREG(mode);
411 int s_isdir(mode_t mode)
413 return S_ISDIR(mode);
415 int s_ischr(mode_t mode)
417 return S_ISCHR(mode);
419 int s_isblk(mode_t mode)
421 return S_ISBLK(mode);
423 int s_isfifo(mode_t mode)
425 return S_ISFIFO(mode);
427 #ifndef LISP_FEATURE_WIN32
428 int s_islnk(mode_t mode)
431 return S_ISLNK(mode);
433 return ((mode & S_IFMT) == S_IFLNK);
436 int s_issock(mode_t mode)
439 return S_ISSOCK(mode);
441 return ((mode & S_IFMT) == S_IFSOCK);
444 #endif /* !LISP_FEATURE_WIN32 */