summary refs log tree commit diff
path: root/elf/dl-misc.c
blob: 3d796360b325da740cd813796d5dc2b74480fd36 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
/* Miscellaneous support functions for dynamic linker
   Copyright (C) 1997, 1998 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 <unistd.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.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 *
_dl_sysdep_read_whole_file (const char *file, size_t *sizep, int prot)
{
  void *result;
  struct stat st;
  int fd = __open (file, O_RDONLY);
  if (fd < 0)
    return NULL;
  if (__fxstat (_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;


void
_dl_sysdep_output (int fd, const char *msg, ...)
{
  va_list ap;

  va_start (ap, msg);
  do
    {
      size_t len = strlen (msg);
      __write (fd, msg, len);
      msg = va_arg (ap, const char *);
    }
  while (msg != NULL);
  va_end (ap);
}


void
_dl_debug_message (int new_line, const char *msg, ...)
{
  /* We print the strings we get passed one after the other but start all
     lines using the current PID.  */
  static int pid;
  va_list ap;

  if (pid == 0)
    pid = getpid ();

  va_start (ap, msg);
  do
    if (msg[0] == '\0')
      /* Get the next argument.  */
      msg = va_arg (ap, const char *);
    else
      {
	const char *endp;

	/* We actually will print something in this line.  So print the
	   PID now if needed.  */
	if (new_line)
	  {
	    char buf[7] = "00000:\t";
	    assert (pid >= 0 && pid < 100000);
	    _itoa_word (pid, &buf[5], 10, 0);
	    __write (_dl_debug_fd, buf, 7);
	    new_line = 0;
	  }

	endp = strchr (msg, '\n');
	if (endp == NULL)
	  {
	    __write (_dl_debug_fd, msg, strlen (msg));
	    msg = va_arg (ap, const char *);
	  }
	else
	  {
	    __write (_dl_debug_fd, msg, endp - msg + 1);
	    msg = endp + 1;
	    new_line = 1;
	  }
      }
  while (msg != NULL);
  va_end (ap);
}