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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
Copyright (C) 2010 ABRT team
Copyright (C) 2010 RedHat Inc
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* Utility routines.
*
*/
#include "abrtlib.h"
#define CONFIG_FEATURE_COPYBUF_KB 4
static const char msg_write_error[] = "write error";
static const char msg_read_error[] = "read error";
static off_t full_fd_action(int src_fd, int dst_fd, off_t size, int flags)
{
int status = -1;
off_t total = 0;
int last_was_seek = 0;
#if CONFIG_FEATURE_COPYBUF_KB <= 4
char buffer[CONFIG_FEATURE_COPYBUF_KB * 1024];
enum { buffer_size = sizeof(buffer) };
#else
char *buffer;
int buffer_size;
/* We want page-aligned buffer, just in case kernel is clever
* and can do page-aligned io more efficiently */
buffer = mmap(NULL, CONFIG_FEATURE_COPYBUF_KB * 1024,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON,
/* ignored: */ -1, 0);
buffer_size = CONFIG_FEATURE_COPYBUF_KB * 1024;
if (buffer == MAP_FAILED) {
buffer = alloca(4 * 1024);
buffer_size = 4 * 1024;
}
#endif
if (src_fd < 0)
goto out;
if (!size) {
size = buffer_size;
status = 1; /* copy until eof */
}
while (1) {
ssize_t rd;
rd = safe_read(src_fd, buffer, size > buffer_size ? buffer_size : size);
if (!rd) { /* eof - all done */
if (last_was_seek) {
if (lseek(dst_fd, -1, SEEK_CUR) < 0
|| safe_write(dst_fd, "", 1) != 1
) {
perror_msg("%s", msg_write_error);
break;
}
}
status = 0;
break;
}
if (rd < 0) {
perror_msg("%s", msg_read_error);
break;
}
/* dst_fd == -1 is a fake, else... */
if (dst_fd >= 0) {
if (flags & COPYFD_SPARSE) {
ssize_t cnt = rd;
while (--cnt >= 0)
if (buffer[cnt] != 0)
goto need2write;
if (lseek(dst_fd, rd, SEEK_CUR) < 0) {
flags &= ~COPYFD_SPARSE;
goto need2write;
}
last_was_seek = 1;
} else {
need2write:
{
ssize_t wr = full_write(dst_fd, buffer, rd);
if (wr < rd) {
perror_msg("%s", msg_write_error);
break;
}
last_was_seek = 0;
}
}
}
total += rd;
if (status < 0) { /* if we aren't copying till EOF... */
size -= rd;
if (!size) {
/* 'size' bytes copied - all done */
status = 0;
break;
}
}
}
out:
#if CONFIG_FEATURE_COPYBUF_KB > 4
if (buffer_size != 4 * 1024)
munmap(buffer, buffer_size);
#endif
return status ? -1 : total;
}
off_t copyfd_size(int fd1, int fd2, off_t size, int flags)
{
if (size) {
return full_fd_action(fd1, fd2, size, flags);
}
return 0;
}
void copyfd_exact_size(int fd1, int fd2, off_t size)
{
off_t sz = copyfd_size(fd1, fd2, size, /*flags:*/ 0);
if (sz == size)
return;
if (sz != -1)
error_msg_and_die("short read");
/* if sz == -1, copyfd_XX already complained */
xfunc_die();
}
off_t copyfd_eof(int fd1, int fd2, int flags)
{
return full_fd_action(fd1, fd2, 0, flags);
}
off_t copy_file(const char *src_name, const char *dst_name, int mode)
{
off_t r;
int src = open(src_name, O_RDONLY);
if (src < 0)
{
perror_msg("Can't open '%s'", src_name);
return -1;
}
int dst = open(dst_name, O_WRONLY | O_TRUNC | O_CREAT, mode);
if (dst < 0)
{
close(src);
perror_msg("Can't open '%s'", dst_name);
return -1;
}
r = copyfd_eof(src, dst, /*flags:*/ 0);
close(src);
close(dst);
return r;
}
|
