1 /* Miscellaneous support functions for dynamic linker
2 Copyright (C) 1997-2002, 2003, 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
30 #include <sys/param.h>
34 #include <stdio-common/_itoa.h>
35 #include <bits/libc-lock.h>
38 /* This is the only dl-sysdep.c function that is actually needed at run-time
42 _dl_sysdep_open_zero_fill (void)
44 return __open ("/dev/zero", O_RDONLY);
48 /* Read the whole contents of FILE into new mmap'd space with given
49 protections. *SIZEP gets the size of the file. On error MAP_FAILED
54 _dl_sysdep_read_whole_file (const char *file, size_t *sizep, int prot)
56 void *result = MAP_FAILED;
58 int fd = __open (file, O_RDONLY);
61 if (__fxstat64 (_STAT_VER, fd, &st) >= 0)
65 /* No need to map the file if it is empty. */
67 /* Map a copy of the file contents. */
68 result = __mmap (NULL, *sizep, prot,
85 /* Bare-bones printf implementation. This function only knows about
86 the formats and flags needed and can handle only up to 64 stripes in
89 _dl_debug_vdprintf (int fd, int tag_p, const char *fmt, va_list arg)
91 const int niovmax = 64;
92 struct iovec iov[niovmax];
99 const char *startp = fmt;
103 /* Generate the tag line once. It consists of the PID and a
104 colon followed by a tab. */
109 assert (pid >= 0 && sizeof (pid_t) <= 4);
110 p = _itoa (pid, &pidbuf[10], 10, 0);
117 /* Append to the output. */
118 assert (niov < niovmax);
119 iov[niov].iov_len = 12;
120 iov[niov++].iov_base = pidbuf;
122 /* No more tags until we see the next newline. */
126 /* Skip everything except % and \n (if tags are needed). */
127 while (*fmt != '\0' && *fmt != '%' && (! tag_p || *fmt != '\n'))
130 /* Append constant string. */
131 assert (niov < niovmax);
132 if ((iov[niov].iov_len = fmt - startp) != 0)
133 iov[niov++].iov_base = (char *) startp;
137 /* It is a format specifier. */
141 #if LONG_MAX != INT_MAX
145 /* Recognize zero-digit fill flag. */
152 /* See whether with comes from a parameter. Note that no other
153 way to specify the width is implemented. */
156 width = va_arg (arg, int);
160 /* Handle precision. */
161 if (*fmt == '.' && fmt[1] == '*')
163 prec = va_arg (arg, int);
167 /* Recognize the l modifier. It is only important on some
168 platforms where long and int have a different size. We
169 can use the same code for size_t. */
170 if (*fmt == 'l' || *fmt == 'Z')
172 #if LONG_MAX != INT_MAX
180 /* Integer formatting. */
184 /* We have to make a difference if long and int have a
186 #if LONG_MAX != INT_MAX
187 unsigned long int num = (long_mod
188 ? va_arg (arg, unsigned long int)
189 : va_arg (arg, unsigned int));
191 unsigned long int num = va_arg (arg, unsigned int);
193 /* We use alloca() to allocate the buffer with the most
194 pessimistic guess for the size. Using alloca() allows
195 having more than one integer formatting in a call. */
196 char *buf = (char *) alloca (3 * sizeof (unsigned long int));
197 char *endp = &buf[3 * sizeof (unsigned long int)];
198 char *cp = _itoa (num, endp, *fmt == 'x' ? 16 : 10, 0);
200 /* Pad to the width the user specified. */
202 while (endp - cp < width)
205 iov[niov].iov_base = cp;
206 iov[niov].iov_len = endp - cp;
212 /* Get the string argument. */
213 iov[niov].iov_base = va_arg (arg, char *);
214 iov[niov].iov_len = strlen (iov[niov].iov_base);
216 iov[niov].iov_len = MIN ((size_t) prec, iov[niov].iov_len);
221 iov[niov].iov_base = (void *) fmt;
222 iov[niov].iov_len = 1;
227 assert (! "invalid format specifier");
231 else if (*fmt == '\n')
233 /* See whether we have to print a single newline character. */
236 iov[niov].iov_base = (char *) startp;
237 iov[niov++].iov_len = 1;
240 /* No, just add it to the rest of the string. */
241 ++iov[niov - 1].iov_len;
243 /* Next line, print a tag again. */
249 /* Finally write the result. */
250 #ifdef INTERNAL_SYSCALL
251 INTERNAL_SYSCALL_DECL (err);
252 INTERNAL_SYSCALL (writev, err, 3, fd, &iov, niov);
253 #elif RTLD_PRIVATE_ERRNO
254 /* We have to take this lock just to be sure we don't clobber the private
255 errno when it's being used by another thread that cares about it.
256 Yet we must be sure not to try calling the lock functions before
257 the thread library is fully initialized. */
258 if (__builtin_expect (INTUSE (_dl_starting_up), 0))
259 __writev (fd, iov, niov);
262 __rtld_lock_lock_recursive (GL(dl_load_lock));
263 __writev (fd, iov, niov);
264 __rtld_lock_unlock_recursive (GL(dl_load_lock));
267 __writev (fd, iov, niov);
272 /* Write to debug file. */
274 _dl_debug_printf (const char *fmt, ...)
279 _dl_debug_vdprintf (GLRO(dl_debug_fd), 1, fmt, arg);
284 /* Write to debug file but don't start with a tag. */
286 _dl_debug_printf_c (const char *fmt, ...)
291 _dl_debug_vdprintf (GLRO(dl_debug_fd), -1, fmt, arg);
296 /* Write the given file descriptor. */
298 _dl_dprintf (int fd, const char *fmt, ...)
303 _dl_debug_vdprintf (fd, 0, fmt, arg);
308 /* Test whether given NAME matches any of the names of the given object. */
311 _dl_name_match_p (const char *name, struct link_map *map)
313 if (strcmp (name, map->l_name) == 0)
316 struct libname_list *runp = map->l_libname;
319 if (strcmp (name, runp->name) == 0)