287 lines
6.7 KiB
C
287 lines
6.7 KiB
C
/* Miscellaneous support functions for dynamic linker
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Copyright (C) 1997,1998,1999,2000,2001,2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <assert.h>
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#include <fcntl.h>
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#include <ldsodefs.h>
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#include <limits.h>
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#include <link.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <stdio-common/_itoa.h>
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#ifndef MAP_ANON
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/* This is the only dl-sysdep.c function that is actually needed at run-time
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by _dl_map_object. */
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int
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_dl_sysdep_open_zero_fill (void)
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{
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return __open ("/dev/zero", O_RDONLY);
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}
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#endif
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/* Read the whole contents of FILE into new mmap'd space with given
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protections. *SIZEP gets the size of the file. On error MAP_FAILED
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is returned. */
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void *
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internal_function
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_dl_sysdep_read_whole_file (const char *file, size_t *sizep, int prot)
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{
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void *result = MAP_FAILED;
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struct stat64 st;
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int fd = __open (file, O_RDONLY);
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if (fd >= 0)
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{
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if (__fxstat64 (_STAT_VER, fd, &st) >= 0)
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{
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*sizep = st.st_size;
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/* No need to map the file if it is empty. */
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if (*sizep != 0)
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/* Map a copy of the file contents. */
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result = __mmap (NULL, *sizep, prot,
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#ifdef MAP_COPY
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MAP_COPY
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#else
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MAP_PRIVATE
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#endif
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#ifdef MAP_FILE
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| MAP_FILE
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#endif
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, fd, 0);
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}
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__close (fd);
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}
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return result;
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}
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/* Bare-bone printf implementation. This function only knows about
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the formats and flags needed and can handle only up to 64 stripes in
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the output. */
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static void
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_dl_debug_vdprintf (int fd, int tag_p, const char *fmt, va_list arg)
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{
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const int niovmax = 64;
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struct iovec iov[niovmax];
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int niov = 0;
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pid_t pid = 0;
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char pidbuf[7];
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while (*fmt != '\0')
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{
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const char *startp = fmt;
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if (tag_p > 0)
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{
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/* Generate the tag line once. It consists of the PID and a
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colon followed by a tab. */
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if (pid == 0)
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{
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char *p;
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pid = __getpid ();
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assert (pid >= 0 && pid < 100000);
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p = _itoa (pid, &pidbuf[5], 10, 0);
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while (p > pidbuf)
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*--p = '0';
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pidbuf[5] = ':';
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pidbuf[6] = '\t';
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}
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/* Append to the output. */
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assert (niov < niovmax);
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iov[niov].iov_len = 7;
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iov[niov++].iov_base = pidbuf;
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/* No more tags until we see the next newline. */
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tag_p = -1;
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}
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/* Skip everything except % and \n (if tags are needed). */
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while (*fmt != '\0' && *fmt != '%' && (! tag_p || *fmt != '\n'))
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++fmt;
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/* Append constant string. */
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assert (niov < niovmax);
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if ((iov[niov].iov_len = fmt - startp) != 0)
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iov[niov++].iov_base = (char *) startp;
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if (*fmt == '%')
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{
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/* It is a format specifier. */
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char fill = ' ';
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int width = -1;
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int prec = -1;
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#if LONG_MAX != INT_MAX
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int long_mod = 0;
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#endif
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/* Recognize zero-digit fill flag. */
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if (*++fmt == '0')
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{
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fill = '0';
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++fmt;
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}
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/* See whether with comes from a parameter. Note that no other
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way to specify the width is implemented. */
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if (*fmt == '*')
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{
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width = va_arg (arg, int);
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++fmt;
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}
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/* Handle precision. */
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if (*fmt == '.' && fmt[1] == '*')
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{
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prec = va_arg (arg, int);
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fmt += 2;
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}
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/* Recognize the l modifier. It is only important on some
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platforms where long and int have a different size. We
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can use the same code for size_t. */
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if (*fmt == 'l' || *fmt == 'Z')
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{
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#if LONG_MAX != INT_MAX
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long_mod = 1;
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#endif
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++fmt;
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}
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switch (*fmt)
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{
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/* Integer formatting. */
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case 'u':
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case 'x':
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{
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/* We have to make a difference if long and int have a
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different size. */
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#if LONG_MAX != INT_MAX
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unsigned long int num = (long_mod
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? va_arg (arg, unsigned long int)
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: va_arg (arg, unsigned int));
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#else
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unsigned long int num = va_arg (arg, unsigned int);
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#endif
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/* We use alloca() to allocate the buffer with the most
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pessimistic guess for the size. Using alloca() allows
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having more than one integer formatting in a call. */
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char *buf = (char *) alloca (3 * sizeof (unsigned long int));
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char *endp = &buf[3 * sizeof (unsigned long int)];
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char *cp = _itoa (num, endp, *fmt == 'x' ? 16 : 10, 0);
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/* Pad to the width the user specified. */
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if (width != -1)
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while (endp - cp < width)
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*--cp = fill;
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iov[niov].iov_base = cp;
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iov[niov].iov_len = endp - cp;
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++niov;
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}
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break;
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case 's':
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/* Get the string argument. */
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iov[niov].iov_base = va_arg (arg, char *);
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iov[niov].iov_len = strlen (iov[niov].iov_base);
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if (prec != -1)
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iov[niov].iov_len = MIN (prec, iov[niov].iov_len );
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++niov;
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break;
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case '%':
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iov[niov].iov_base = (void *) fmt;
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iov[niov].iov_len = 1;
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++niov;
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break;
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default:
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assert (! "invalid format specifier");
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}
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++fmt;
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}
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else if (*fmt == '\n')
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{
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/* See whether we have to print a single newline character. */
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if (fmt == startp)
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{
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iov[niov].iov_base = (char *) startp;
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iov[niov++].iov_len = 1;
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}
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else
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/* No, just add it to the rest of the string. */
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++iov[niov - 1].iov_len;
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/* Next line, print a tag again. */
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tag_p = 1;
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++fmt;
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}
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}
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/* Finally write the result. */
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__writev (fd, iov, niov);
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}
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/* Write to debug file. */
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void
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_dl_debug_printf (const char *fmt, ...)
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{
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va_list arg;
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va_start (arg, fmt);
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_dl_debug_vdprintf (GL(dl_debug_fd), 1, fmt, arg);
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va_end (arg);
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}
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INTDEF(_dl_debug_printf)
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/* Write to debug file but don't start with a tag. */
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void
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_dl_debug_printf_c (const char *fmt, ...)
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{
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va_list arg;
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va_start (arg, fmt);
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_dl_debug_vdprintf (GL(dl_debug_fd), -1, fmt, arg);
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va_end (arg);
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}
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/* Write the given file descriptor. */
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void
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_dl_dprintf (int fd, const char *fmt, ...)
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{
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va_list arg;
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va_start (arg, fmt);
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_dl_debug_vdprintf (fd, 0, fmt, arg);
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va_end (arg);
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}
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