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
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <string.h>
#include <syscall.h>
#include <time.h>
extern "C" {
int fcntl(int fd, int cmd, ...)
{
va_list ap;
va_start(ap, cmd);
u32 extra_arg = va_arg(ap, u32);
int rc = syscall(SC_fcntl, fd, cmd, extra_arg);
va_end(ap);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int create_inode_watcher(unsigned flags)
{
int rc = syscall(SC_create_inode_watcher, flags);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int inode_watcher_add_watch(int fd, char const* path, size_t path_length, unsigned event_mask)
{
Syscall::SC_inode_watcher_add_watch_params params { { path, path_length }, fd, event_mask };
int rc = syscall(SC_inode_watcher_add_watch, ¶ms);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int inode_watcher_remove_watch(int fd, int wd)
{
int rc = syscall(SC_inode_watcher_remove_watch, fd, wd);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int creat(char const* path, mode_t mode)
{
return open(path, O_CREAT | O_WRONLY | O_TRUNC, mode);
}
int open(char const* path, int options, ...)
{
if (!path) {
errno = EFAULT;
return -1;
}
auto path_length = strlen(path);
if (path_length > INT32_MAX) {
errno = EINVAL;
return -1;
}
va_list ap;
va_start(ap, options);
auto mode = (mode_t)va_arg(ap, unsigned);
va_end(ap);
Syscall::SC_open_params params { AT_FDCWD, { path, path_length }, options, mode };
int rc = syscall(SC_open, ¶ms);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int openat(int dirfd, char const* path, int options, ...)
{
if (!path) {
errno = EFAULT;
return -1;
}
auto path_length = strlen(path);
if (path_length > INT32_MAX) {
errno = EINVAL;
return -1;
}
va_list ap;
va_start(ap, options);
auto mode = (mode_t)va_arg(ap, unsigned);
va_end(ap);
Syscall::SC_open_params params { dirfd, { path, path_length }, options, mode };
int rc = syscall(SC_open, ¶ms);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_fadvise.html
int posix_fadvise(int fd, off_t offset, off_t len, int advice)
{
// Per POSIX:
// "The posix_fadvise() function shall have no effect on the semantics of other operations on the specified data,
// although it may affect the performance of other operations."
// For now, we simply ignore posix_fadvise() requests. In the future we may use them to optimize performance.
(void)fd;
(void)offset;
(void)len;
(void)advice;
return 0;
}
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/utimensat.html
int utimensat(int dirfd, char const* path, struct timespec const times[2], int flag)
{
if (!path) {
errno = EFAULT;
return -1;
}
size_t path_length = strlen(path);
if (path_length > INT32_MAX) {
errno = EINVAL;
return -1;
}
// POSIX allows AT_SYMLINK_NOFOLLOW flag or no flags.
if (flag & ~AT_SYMLINK_NOFOLLOW) {
errno = EINVAL;
return -1;
}
// Return early without error since both changes are to be omitted.
if (times && times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT)
return 0;
// According to POSIX, when times is a nullptr, it's equivalent to setting
// both last access time and last modification time to the current time.
// Setting the times argument to nullptr if it matches this case prevents
// the need to copy it in the kernel.
if (times && times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW)
times = nullptr;
if (times) {
for (int i = 0; i < 2; ++i) {
if ((times[i].tv_nsec != UTIME_NOW && times[i].tv_nsec != UTIME_OMIT)
&& (times[i].tv_nsec < 0 || times[i].tv_nsec >= 1'000'000'000L)) {
errno = EINVAL;
return -1;
}
}
}
Syscall::SC_utimensat_params params { dirfd, { path, path_length }, times, flag };
int rc = syscall(SC_utimensat, ¶ms);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
}
|
