1 /* Miscellaneous support functions for dynamic linker
2 Copyright (C) 1997,1998,1999,2000,2001,2002 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>
33 #include <stdio-common/_itoa.h>
34 #include <bits/libc-lock.h>
37 /* This is the only dl-sysdep.c function that is actually needed at run-time
41 _dl_sysdep_open_zero_fill (void)
43 return __open ("/dev/zero", O_RDONLY);
47 /* Read the whole contents of FILE into new mmap'd space with given
48 protections. *SIZEP gets the size of the file. On error MAP_FAILED
53 _dl_sysdep_read_whole_file (const char *file, size_t *sizep, int prot)
55 void *result = MAP_FAILED;
57 int fd = __open (file, O_RDONLY);
60 if (__fxstat64 (_STAT_VER, fd, &st) >= 0)
64 /* No need to map the file if it is empty. */
66 /* Map a copy of the file contents. */
67 result = __mmap (NULL, *sizep, prot,
84 /* Bare-bone printf implementation. This function only knows about
85 the formats and flags needed and can handle only up to 64 stripes in
88 _dl_debug_vdprintf (int fd, int tag_p, const char *fmt, va_list arg)
90 const int niovmax = 64;
91 struct iovec iov[niovmax];
98 const char *startp = fmt;
102 /* Generate the tag line once. It consists of the PID and a
103 colon followed by a tab. */
108 assert (pid >= 0 && pid < 100000);
109 p = _itoa (pid, &pidbuf[5], 10, 0);
116 /* Append to the output. */
117 assert (niov < niovmax);
118 iov[niov].iov_len = 7;
119 iov[niov++].iov_base = pidbuf;
121 /* No more tags until we see the next newline. */
125 /* Skip everything except % and \n (if tags are needed). */
126 while (*fmt != '\0' && *fmt != '%' && (! tag_p || *fmt != '\n'))
129 /* Append constant string. */
130 assert (niov < niovmax);
131 if ((iov[niov].iov_len = fmt - startp) != 0)
132 iov[niov++].iov_base = (char *) startp;
136 /* It is a format specifier. */
140 #if LONG_MAX != INT_MAX
144 /* Recognize zero-digit fill flag. */
151 /* See whether with comes from a parameter. Note that no other
152 way to specify the width is implemented. */
155 width = va_arg (arg, int);
159 /* Handle precision. */
160 if (*fmt == '.' && fmt[1] == '*')
162 prec = va_arg (arg, int);
166 /* Recognize the l modifier. It is only important on some
167 platforms where long and int have a different size. We
168 can use the same code for size_t. */
169 if (*fmt == 'l' || *fmt == 'Z')
171 #if LONG_MAX != INT_MAX
179 /* Integer formatting. */
183 /* We have to make a difference if long and int have a
185 #if LONG_MAX != INT_MAX
186 unsigned long int num = (long_mod
187 ? va_arg (arg, unsigned long int)
188 : va_arg (arg, unsigned int));
190 unsigned long int num = va_arg (arg, unsigned int);
192 /* We use alloca() to allocate the buffer with the most
193 pessimistic guess for the size. Using alloca() allows
194 having more than one integer formatting in a call. */
195 char *buf = (char *) alloca (3 * sizeof (unsigned long int));
196 char *endp = &buf[3 * sizeof (unsigned long int)];
197 char *cp = _itoa (num, endp, *fmt == 'x' ? 16 : 10, 0);
199 /* Pad to the width the user specified. */
201 while (endp - cp < width)
204 iov[niov].iov_base = cp;
205 iov[niov].iov_len = endp - cp;
211 /* Get the string argument. */
212 iov[niov].iov_base = va_arg (arg, char *);
213 iov[niov].iov_len = strlen (iov[niov].iov_base);
215 iov[niov].iov_len = MIN ((size_t) prec, iov[niov].iov_len);
220 iov[niov].iov_base = (void *) fmt;
221 iov[niov].iov_len = 1;
226 assert (! "invalid format specifier");
230 else if (*fmt == '\n')
232 /* See whether we have to print a single newline character. */
235 iov[niov].iov_base = (char *) startp;
236 iov[niov++].iov_len = 1;
239 /* No, just add it to the rest of the string. */
240 ++iov[niov - 1].iov_len;
242 /* Next line, print a tag again. */
248 /* Finally write the result. */
249 #ifdef INTERNAL_SYSCALL
250 INTERNAL_SYSCALL (writev, 3, fd, iov, niov);
251 #elif RTLD_PRIVATE_ERRNO
252 /* We have to take this lock just to be sure we don't clobber the private
253 errno when it's being used by another thread that cares about it. */
254 __libc_lock_lock_recursive (GL(dl_load_lock));
255 __writev (fd, iov, niov);
256 __libc_lock_unlock_recursive (GL(dl_load_lock));
258 __writev (fd, iov, niov);
263 /* Write to debug file. */
265 _dl_debug_printf (const char *fmt, ...)
270 _dl_debug_vdprintf (GL(dl_debug_fd), 1, fmt, arg);
273 INTDEF(_dl_debug_printf)
276 /* Write to debug file but don't start with a tag. */
278 _dl_debug_printf_c (const char *fmt, ...)
283 _dl_debug_vdprintf (GL(dl_debug_fd), -1, fmt, arg);
288 /* Write the given file descriptor. */
290 _dl_dprintf (int fd, const char *fmt, ...)
295 _dl_debug_vdprintf (fd, 0, fmt, arg);