Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
2/*
3 * Special types used by various syscalls for NOLIBC
4 * Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
5 */
6
7#ifndef _NOLIBC_TYPES_H
8#define _NOLIBC_TYPES_H
9
10#include "std.h"
11#include <linux/time.h>
12#include <linux/stat.h>
13
14
15/* Only the generic macros and types may be defined here. The arch-specific
16 * ones such as the O_RDONLY and related macros used by fcntl() and open(), or
17 * the layout of sys_stat_struct must not be defined here.
18 */
19
20/* stat flags (WARNING, octal here). We need to check for an existing
21 * definition because linux/stat.h may omit to define those if it finds
22 * that any glibc header was already included.
23 */
24#if !defined(S_IFMT)
25#define S_IFDIR 0040000
26#define S_IFCHR 0020000
27#define S_IFBLK 0060000
28#define S_IFREG 0100000
29#define S_IFIFO 0010000
30#define S_IFLNK 0120000
31#define S_IFSOCK 0140000
32#define S_IFMT 0170000
33
34#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
35#define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)
36#define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)
37#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
38#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
39#define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)
40#define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
41
42#define S_IRWXU 00700
43#define S_IRUSR 00400
44#define S_IWUSR 00200
45#define S_IXUSR 00100
46
47#define S_IRWXG 00070
48#define S_IRGRP 00040
49#define S_IWGRP 00020
50#define S_IXGRP 00010
51
52#define S_IRWXO 00007
53#define S_IROTH 00004
54#define S_IWOTH 00002
55#define S_IXOTH 00001
56#endif
57
58/* dirent types */
59#define DT_UNKNOWN 0x0
60#define DT_FIFO 0x1
61#define DT_CHR 0x2
62#define DT_DIR 0x4
63#define DT_BLK 0x6
64#define DT_REG 0x8
65#define DT_LNK 0xa
66#define DT_SOCK 0xc
67
68/* commonly an fd_set represents 256 FDs */
69#ifndef FD_SETSIZE
70#define FD_SETSIZE 256
71#endif
72
73/* PATH_MAX and MAXPATHLEN are often used and found with plenty of different
74 * values.
75 */
76#ifndef PATH_MAX
77#define PATH_MAX 4096
78#endif
79
80#ifndef MAXPATHLEN
81#define MAXPATHLEN (PATH_MAX)
82#endif
83
84/* whence values for lseek() */
85#define SEEK_SET 0
86#define SEEK_CUR 1
87#define SEEK_END 2
88
89/* cmd for reboot() */
90#define LINUX_REBOOT_MAGIC1 0xfee1dead
91#define LINUX_REBOOT_MAGIC2 0x28121969
92#define LINUX_REBOOT_CMD_HALT 0xcdef0123
93#define LINUX_REBOOT_CMD_POWER_OFF 0x4321fedc
94#define LINUX_REBOOT_CMD_RESTART 0x01234567
95#define LINUX_REBOOT_CMD_SW_SUSPEND 0xd000fce2
96
97/* Macros used on waitpid()'s return status */
98#define WEXITSTATUS(status) (((status) & 0xff00) >> 8)
99#define WIFEXITED(status) (((status) & 0x7f) == 0)
100#define WTERMSIG(status) ((status) & 0x7f)
101#define WIFSIGNALED(status) ((status) - 1 < 0xff)
102
103/* waitpid() flags */
104#define WNOHANG 1
105
106/* standard exit() codes */
107#define EXIT_SUCCESS 0
108#define EXIT_FAILURE 1
109
110#define FD_SETIDXMASK (8 * sizeof(unsigned long))
111#define FD_SETBITMASK (8 * sizeof(unsigned long)-1)
112
113/* for select() */
114typedef struct {
115 unsigned long fds[(FD_SETSIZE + FD_SETBITMASK) / FD_SETIDXMASK];
116} fd_set;
117
118#define FD_CLR(fd, set) do { \
119 fd_set *__set = (set); \
120 int __fd = (fd); \
121 if (__fd >= 0) \
122 __set->fds[__fd / FD_SETIDXMASK] &= \
123 ~(1U << (__fd & FX_SETBITMASK)); \
124 } while (0)
125
126#define FD_SET(fd, set) do { \
127 fd_set *__set = (set); \
128 int __fd = (fd); \
129 if (__fd >= 0) \
130 __set->fds[__fd / FD_SETIDXMASK] |= \
131 1 << (__fd & FD_SETBITMASK); \
132 } while (0)
133
134#define FD_ISSET(fd, set) ({ \
135 fd_set *__set = (set); \
136 int __fd = (fd); \
137 int __r = 0; \
138 if (__fd >= 0) \
139 __r = !!(__set->fds[__fd / FD_SETIDXMASK] & \
1401U << (__fd & FD_SET_BITMASK)); \
141 __r; \
142 })
143
144#define FD_ZERO(set) do { \
145 fd_set *__set = (set); \
146 int __idx; \
147 int __size = (FD_SETSIZE+FD_SETBITMASK) / FD_SETIDXMASK;\
148 for (__idx = 0; __idx < __size; __idx++) \
149 __set->fds[__idx] = 0; \
150 } while (0)
151
152/* for poll() */
153#define POLLIN 0x0001
154#define POLLPRI 0x0002
155#define POLLOUT 0x0004
156#define POLLERR 0x0008
157#define POLLHUP 0x0010
158#define POLLNVAL 0x0020
159
160struct pollfd {
161 int fd;
162 short int events;
163 short int revents;
164};
165
166/* for getdents64() */
167struct linux_dirent64 {
168 uint64_t d_ino;
169 int64_t d_off;
170 unsigned short d_reclen;
171 unsigned char d_type;
172 char d_name[];
173};
174
175/* needed by wait4() */
176struct rusage {
177 struct timeval ru_utime;
178 struct timeval ru_stime;
179 long ru_maxrss;
180 long ru_ixrss;
181 long ru_idrss;
182 long ru_isrss;
183 long ru_minflt;
184 long ru_majflt;
185 long ru_nswap;
186 long ru_inblock;
187 long ru_oublock;
188 long ru_msgsnd;
189 long ru_msgrcv;
190 long ru_nsignals;
191 long ru_nvcsw;
192 long ru_nivcsw;
193};
194
195/* The format of the struct as returned by the libc to the application, which
196 * significantly differs from the format returned by the stat() syscall flavours.
197 */
198struct stat {
199 dev_t st_dev; /* ID of device containing file */
200 ino_t st_ino; /* inode number */
201 mode_t st_mode; /* protection */
202 nlink_t st_nlink; /* number of hard links */
203 uid_t st_uid; /* user ID of owner */
204 gid_t st_gid; /* group ID of owner */
205 dev_t st_rdev; /* device ID (if special file) */
206 off_t st_size; /* total size, in bytes */
207 blksize_t st_blksize; /* blocksize for file system I/O */
208 blkcnt_t st_blocks; /* number of 512B blocks allocated */
209 time_t st_atime; /* time of last access */
210 time_t st_mtime; /* time of last modification */
211 time_t st_ctime; /* time of last status change */
212};
213
214/* WARNING, it only deals with the 4096 first majors and 256 first minors */
215#define makedev(major, minor) ((dev_t)((((major) & 0xfff) << 8) | ((minor) & 0xff)))
216#define major(dev) ((unsigned int)(((dev) >> 8) & 0xfff))
217#define minor(dev) ((unsigned int)(((dev) & 0xff))
218
219#ifndef offsetof
220#define offsetof(TYPE, FIELD) ((size_t) &((TYPE *)0)->FIELD)
221#endif
222
223#ifndef container_of
224#define container_of(PTR, TYPE, FIELD) ({ \
225 __typeof__(((TYPE *)0)->FIELD) *__FIELD_PTR = (PTR); \
226 (TYPE *)((char *) __FIELD_PTR - offsetof(TYPE, FIELD)); \
227})
228#endif
229
230/* make sure to include all global symbols */
231#include "nolibc.h"
232
233#endif /* _NOLIBC_TYPES_H */