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
|
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This 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.
This 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 this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA */
#include "mysys_priv.h"
#include "mysys_err.h"
#include <errno.h>
#ifdef HAVE_PREAD
#include <unistd.h>
#endif
/* Read a chunk of bytes from a file */
uint my_pread(File Filedes, byte *Buffer, uint Count, my_off_t offset,
myf MyFlags)
{
uint readbytes;
DBUG_ENTER("my_pread");
DBUG_PRINT("my",("Fd: %d Seek: %lu Buffer: %lx Count: %u MyFlags: %d",
Filedes, (ulong) offset, Buffer, Count, MyFlags));
for (;;)
{
#ifndef __WIN__
errno=0; /* Linux doesn't reset this */
#endif
#ifndef HAVE_PREAD
readbytes= (uint) -1;
if (lseek(Filedes, offset, MY_SEEK_SET) == -1L ||
(readbytes = (uint) read(Filedes, Buffer, Count)) != Count)
#else
if ((readbytes = (uint) pread(Filedes, Buffer, Count, offset)) != Count)
#endif
{
my_errno=errno;
DBUG_PRINT("warning",("Read only %ld bytes off %ld from %d, errno: %d",
readbytes,Count,Filedes,my_errno));
#ifdef THREAD
if (readbytes == 0 && errno == EINTR)
continue; /* Interrupted */
#endif
if (MyFlags & (MY_WME | MY_FAE | MY_FNABP))
{
if ((int) readbytes == -1)
my_error(EE_READ, MYF(ME_BELL+ME_WAITTANG),
my_filename(Filedes),my_errno);
else if (MyFlags & (MY_NABP | MY_FNABP))
my_error(EE_EOFERR, MYF(ME_BELL+ME_WAITTANG),
my_filename(Filedes),my_errno);
}
if ((int) readbytes == -1 || (MyFlags & (MY_FNABP | MY_NABP)))
DBUG_RETURN(MY_FILE_ERROR); /* Return with error */
}
if (MyFlags & (MY_NABP | MY_FNABP))
DBUG_RETURN(0); /* Ok vid l{sning */
DBUG_RETURN(readbytes); /* purecov: inspected */
}
} /* my_pread */
/* Write a chunk of bytes to a file */
uint my_pwrite(int Filedes, const byte *Buffer, uint Count, my_off_t offset,
myf MyFlags)
{
uint writenbytes,errors;
ulong written;
DBUG_ENTER("my_pwrite");
DBUG_PRINT("my",("Fd: %d Seek: %lu Buffer: %lx Count: %d MyFlags: %d",
Filedes, (ulong) offset,Buffer, Count, MyFlags));
errors=0; written=0L;
for (;;)
{
#ifndef HAVE_PREAD
writenbytes= (uint) -1;
if (lseek(Filedes, offset, MY_SEEK_SET) != -1L &&
(writenbytes = (uint) write(Filedes, Buffer, Count)) == Count)
#else
if ((writenbytes = (uint) pwrite(Filedes, Buffer, Count,offset)) == Count)
#endif
break;
if ((int) writenbytes != -1)
{ /* Safegueard */
written+=writenbytes;
Buffer+=writenbytes;
Count-=writenbytes;
offset+=writenbytes;
}
my_errno=errno;
DBUG_PRINT("error",("Write only %d bytes",writenbytes));
#ifndef NO_BACKGROUND
#ifdef THREAD
if (my_thread_var->abort)
MyFlags&= ~ MY_WAIT_IF_FULL; /* End if aborted by user */
#endif
if (my_errno == ENOSPC && (MyFlags & MY_WAIT_IF_FULL))
{
if (!(errors++ % MY_WAIT_GIVE_USER_A_MESSAGE))
my_error(EE_DISK_FULL,MYF(ME_BELL | ME_NOREFRESH),
my_filename(Filedes));
VOID(sleep(MY_WAIT_FOR_USER_TO_FIX_PANIC));
continue;
}
if ((writenbytes == 0 && my_errno == EINTR) ||
(writenbytes > 0 && (uint) writenbytes != (uint) -1))
continue; /* Retry */
#endif
if (MyFlags & (MY_NABP | MY_FNABP))
{
if (MyFlags & (MY_WME | MY_FAE | MY_FNABP))
{
my_error(EE_WRITE, MYF(ME_BELL+ME_WAITTANG),
my_filename(Filedes),my_errno);
}
DBUG_RETURN(MY_FILE_ERROR); /* Error on read */
}
else
break; /* Return bytes written */
}
if (MyFlags & (MY_NABP | MY_FNABP))
DBUG_RETURN(0); /* Want only errors */
DBUG_RETURN(writenbytes+written); /* purecov: inspected */
} /* my_write */
|
