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
|
/*
* Utility routines.
*
* Licensed under GPLv2, see file COPYING in this tarball for details.
*/
#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 status = -1;
off_t total = 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 */
status = 0;
break;
}
if (rd < 0) {
perror_msg(msg_read_error);
break;
}
/* dst_fd == -1 is a fake, else... */
if (dst_fd >= 0) {
ssize_t wr = full_write(dst_fd, buffer, rd);
if (wr < rd) {
perror_msg(msg_write_error);
break;
}
}
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)
{
if (size) {
return full_fd_action(fd1, fd2, size);
}
return 0;
}
void copyfd_exact_size(int fd1, int fd2, off_t size)
{
off_t sz = copyfd_size(fd1, fd2, size);
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)
{
return full_fd_action(fd1, fd2, 0);
}
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);
close(src);
close(dst);
return r;
}
|
