276 lines
6.6 KiB
C
276 lines
6.6 KiB
C
/* Miscellaneous support functions for dynamic linker
|
|
Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <assert.h>
|
|
#include <fcntl.h>
|
|
#include <ldsodefs.h>
|
|
#include <limits.h>
|
|
#include <link.h>
|
|
#include <stdarg.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/uio.h>
|
|
#include <stdio-common/_itoa.h>
|
|
|
|
#ifndef MAP_ANON
|
|
/* This is the only dl-sysdep.c function that is actually needed at run-time
|
|
by _dl_map_object. */
|
|
|
|
int
|
|
_dl_sysdep_open_zero_fill (void)
|
|
{
|
|
return __open ("/dev/zero", O_RDONLY);
|
|
}
|
|
#endif
|
|
|
|
/* Read the whole contents of FILE into new mmap'd space with given
|
|
protections. *SIZEP gets the size of the file. */
|
|
|
|
void *
|
|
internal_function
|
|
_dl_sysdep_read_whole_file (const char *file, size_t *sizep, int prot)
|
|
{
|
|
void *result;
|
|
struct stat64 st;
|
|
int fd = __open (file, O_RDONLY);
|
|
if (fd < 0)
|
|
return NULL;
|
|
if (__fxstat64 (_STAT_VER, fd, &st) < 0
|
|
/* No need to map the file if it is empty. */
|
|
|| st.st_size == 0)
|
|
result = NULL;
|
|
else
|
|
{
|
|
/* Map a copy of the file contents. */
|
|
result = __mmap (0, st.st_size, prot,
|
|
#ifdef MAP_COPY
|
|
MAP_COPY
|
|
#else
|
|
MAP_PRIVATE
|
|
#endif
|
|
#ifdef MAP_FILE
|
|
| MAP_FILE
|
|
#endif
|
|
, fd, 0);
|
|
if (result == MAP_FAILED)
|
|
result = NULL;
|
|
else
|
|
*sizep = st.st_size;
|
|
}
|
|
__close (fd);
|
|
return result;
|
|
}
|
|
|
|
|
|
/* Descriptor to write debug messages to. */
|
|
int _dl_debug_fd = 2;
|
|
|
|
|
|
/* Bare-bone printf implementation. This function only knows about
|
|
the formats and flags needed and can handle only up to 64 stripes in
|
|
the output. */
|
|
static void
|
|
_dl_debug_vdprintf (int fd, int tag_p, const char *fmt, va_list arg)
|
|
{
|
|
const int niovmax = 64;
|
|
struct iovec iov[niovmax];
|
|
int niov = 0;
|
|
pid_t pid = 0;
|
|
char pidbuf[7];
|
|
|
|
while (*fmt != '\0')
|
|
{
|
|
const char *startp = fmt;
|
|
|
|
if (tag_p > 0)
|
|
{
|
|
/* Generate the tag line once. It consists of the PID and a
|
|
colon followed by a tab. */
|
|
if (pid == 0)
|
|
{
|
|
char *p;
|
|
pid = __getpid ();
|
|
assert (pid >= 0 && pid < 100000);
|
|
p = _itoa_word (pid, &pidbuf[5], 10, 0);
|
|
while (p > pidbuf)
|
|
*--p = '0';
|
|
pidbuf[5] = ':';
|
|
pidbuf[6] = '\t';
|
|
}
|
|
|
|
/* Append to the output. */
|
|
assert (niov < niovmax);
|
|
iov[niov].iov_len = 7;
|
|
iov[niov++].iov_base = pidbuf;
|
|
|
|
/* No more tags until we see the next newline. */
|
|
tag_p = -1;
|
|
}
|
|
|
|
/* Skip everything except % and \n (if tags are needed). */
|
|
while (*fmt != '\0' && *fmt != '%' && (! tag_p || *fmt != '\n'))
|
|
++fmt;
|
|
|
|
/* Append constant string. */
|
|
assert (niov < niovmax);
|
|
if ((iov[niov].iov_len = fmt - startp) != 0)
|
|
iov[niov++].iov_base = (char *) startp;
|
|
|
|
if (*fmt == '%')
|
|
{
|
|
/* It is a format specifier. */
|
|
char fill = ' ';
|
|
int width = -1;
|
|
#if LONG_MAX != INT_MAX
|
|
int long_mod = 0;
|
|
#endif
|
|
|
|
/* Recognize zero-digit fill flag. */
|
|
if (*++fmt == '0')
|
|
{
|
|
fill = '0';
|
|
++fmt;
|
|
}
|
|
|
|
/* See whether with comes from a parameter. Note that no other
|
|
way to specify the width is implemented. */
|
|
if (*fmt == '*')
|
|
{
|
|
width = va_arg (arg, int);
|
|
++fmt;
|
|
}
|
|
|
|
/* Recognize the l modifier. It is only important on some
|
|
platforms where long and int have a different size. We
|
|
can use the same code for size_t. */
|
|
if (*fmt == 'l' || *fmt == 'Z')
|
|
{
|
|
#if LONG_MAX != INT_MAX
|
|
long_mod = 1;
|
|
#endif
|
|
++fmt;
|
|
}
|
|
|
|
switch (*fmt)
|
|
{
|
|
/* Integer formatting. */
|
|
case 'u':
|
|
case 'x':
|
|
{
|
|
/* We have to make a difference if long and int have a
|
|
different size. */
|
|
#if LONG_MAX != INT_MAX
|
|
unsigned long int num = (long_mod
|
|
? va_arg (arg, unsigned long int)
|
|
: va_arg (arg, unsigned int));
|
|
#else
|
|
unsigned long int num = va_arg (arg, unsigned int);
|
|
#endif
|
|
/* We use alloca() to allocate the buffer with the most
|
|
pessimistic guess for the size. Using alloca() allows
|
|
having more than one integer formatting in a call. */
|
|
char *buf = (char *) alloca (3 * sizeof (unsigned long int));
|
|
char *endp = &buf[3 * sizeof (unsigned long int)];
|
|
char *cp = _itoa_word (num, endp, *fmt == 'x' ? 16 : 10, 0);
|
|
|
|
/* Pad to the width the user specified. */
|
|
if (width != -1)
|
|
while (endp - cp < width)
|
|
*--cp = fill;
|
|
|
|
iov[niov].iov_base = cp;
|
|
iov[niov].iov_len = endp - cp;
|
|
++niov;
|
|
}
|
|
break;
|
|
|
|
case 's':
|
|
/* Get the string argument. */
|
|
iov[niov].iov_base = va_arg (arg, char *);
|
|
iov[niov].iov_len = strlen (iov[niov].iov_base);
|
|
++niov;
|
|
break;
|
|
|
|
default:
|
|
assert (! "invalid format specifier");
|
|
}
|
|
++fmt;
|
|
}
|
|
else if (*fmt == '\n')
|
|
{
|
|
/* See whether we have to print a single newline character. */
|
|
if (fmt == startp)
|
|
{
|
|
iov[niov].iov_base = (char *) startp;
|
|
iov[niov++].iov_len = 1;
|
|
}
|
|
else
|
|
/* No, just add it to the rest of the string. */
|
|
++iov[niov - 1].iov_len;
|
|
|
|
/* Next line, print a tag again. */
|
|
tag_p = 1;
|
|
++fmt;
|
|
}
|
|
}
|
|
|
|
/* Finally write the result. */
|
|
__writev (fd, iov, niov);
|
|
}
|
|
|
|
|
|
/* Write to debug file. */
|
|
void
|
|
_dl_debug_printf (const char *fmt, ...)
|
|
{
|
|
va_list arg;
|
|
|
|
va_start (arg, fmt);
|
|
_dl_debug_vdprintf (_dl_debug_fd, 1, fmt, arg);
|
|
va_end (arg);
|
|
}
|
|
|
|
|
|
/* Write to debug file but don't start with a tag. */
|
|
void
|
|
_dl_debug_printf_c (const char *fmt, ...)
|
|
{
|
|
va_list arg;
|
|
|
|
va_start (arg, fmt);
|
|
_dl_debug_vdprintf (_dl_debug_fd, -1, fmt, arg);
|
|
va_end (arg);
|
|
}
|
|
|
|
|
|
/* Write the given file descriptor. */
|
|
void
|
|
_dl_dprintf (int fd, const char *fmt, ...)
|
|
{
|
|
va_list arg;
|
|
|
|
va_start (arg, fmt);
|
|
_dl_debug_vdprintf (fd, 0, fmt, arg);
|
|
va_end (arg);
|
|
}
|