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
|
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
void
set_bit(uint8_t *bits, unsigned long index)
{
bits[index / 8] |= (1 << (7 - index % 8));
}
void
clear_bit(uint8_t *bits, unsigned long index)
{
bits[index / 8] &= ~(1 << (7 - index % 8));
}
int
has_bit(uint8_t *bits, unsigned long index)
{
return bits[index / 8] & (1 << (7 - index % 8));
}
int
set_nonblocking(int fd)
{
int oflags;
if ((oflags = fcntl(fd, F_GETFL, 0)) == -1)
return errno;
if (fcntl(fd, F_SETFL, oflags | O_NONBLOCK) == -1)
return errno;
return 0;
}
int
set_blocking(int fd)
{
int oflags;
if ((oflags = fcntl(fd, F_GETFL, 0)) == -1)
return errno;
if (fcntl(fd, F_SETFL, oflags & ~O_NONBLOCK) == -1)
return errno;
return 0;
}
int
mkdirs(char *path)
{
int err = 0;
char *spos = strchr(path + 1, '/'); // Must ignore the root
while (spos != NULL) {
*spos = '\0';
err = mkdir(path, 0777);
*spos = '/';
if (err != 0 && errno != EEXIST) {
err = errno;
break;
}
spos = strchr(spos + 1, '/');
}
return err;
}
int
vopen(int *res, int flags, const char *fmt, ...)
{
int fd, didmkdirs;
char path[PATH_MAX + 1];
va_list ap;
va_start(ap, fmt);
if (vsnprintf(path, PATH_MAX, fmt, ap) >= PATH_MAX) {
va_end(ap);
return ENAMETOOLONG;
}
va_end(ap);
didmkdirs = 0;
again:
fd = open(path, flags, 0666);
if (fd < 0 && errno == ENOENT && (flags & O_CREAT) != 0 && !didmkdirs) {
if (mkdirs(path) == 0) {
didmkdirs = 1;
goto again;
} else
return errno;
}
if (fd >= 0) {
*res = fd;
return 0;
} else
return errno;
}
int
canon_path(const char *path, char **res)
{
char rp[PATH_MAX];
if (realpath(path, rp) == NULL)
return errno;
#if 0
// This could be necessary on solaris.
if (rp[0] != '/') {
char wd[MAXPATHLEN];
if (getcwd(wd, MAXPATHLEN) == NULL)
return errno;
if (strlcat(wd, "/", MAXPATHLEN) >= MAXPATHLEN)
return ENAMETOOLONG;
if (strlcat(wd, rp, MAXPATHLEN) >= MAXPATHLEN)
return ENAMETOOLONG;
strcpy(rp, wd);
}
#endif
if ((*res = strdup(rp)) == NULL)
return ENOMEM;
return 0;
}
size_t
round_to_page(size_t size)
{
size_t psize = getpagesize();
size_t rem = size % psize;
if (rem != 0)
size += psize - rem;
return size;
}
|