xref: /linux/tools/include/nolibc/types.h (revision 06d07429858317ded2db7986113a9e0129cd599b)
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/mman.h>
12 #include <linux/reboot.h> /* for LINUX_REBOOT_* */
13 #include <linux/stat.h>
14 #include <linux/time.h>
15 #include <linux/wait.h>
16 #include <linux/resource.h>
17 
18 
19 /* Only the generic macros and types may be defined here. The arch-specific
20  * ones such as the O_RDONLY and related macros used by fcntl() and open()
21  * must not be defined here.
22  */
23 
24 /* stat flags (WARNING, octal here). We need to check for an existing
25  * definition because linux/stat.h may omit to define those if it finds
26  * that any glibc header was already included.
27  */
28 #if !defined(S_IFMT)
29 #define S_IFDIR        0040000
30 #define S_IFCHR        0020000
31 #define S_IFBLK        0060000
32 #define S_IFREG        0100000
33 #define S_IFIFO        0010000
34 #define S_IFLNK        0120000
35 #define S_IFSOCK       0140000
36 #define S_IFMT         0170000
37 
38 #define S_ISDIR(mode)  (((mode) & S_IFMT) == S_IFDIR)
39 #define S_ISCHR(mode)  (((mode) & S_IFMT) == S_IFCHR)
40 #define S_ISBLK(mode)  (((mode) & S_IFMT) == S_IFBLK)
41 #define S_ISREG(mode)  (((mode) & S_IFMT) == S_IFREG)
42 #define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
43 #define S_ISLNK(mode)  (((mode) & S_IFMT) == S_IFLNK)
44 #define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
45 
46 #define S_IRWXU 00700
47 #define S_IRUSR 00400
48 #define S_IWUSR 00200
49 #define S_IXUSR 00100
50 
51 #define S_IRWXG 00070
52 #define S_IRGRP 00040
53 #define S_IWGRP 00020
54 #define S_IXGRP 00010
55 
56 #define S_IRWXO 00007
57 #define S_IROTH 00004
58 #define S_IWOTH 00002
59 #define S_IXOTH 00001
60 #endif
61 
62 /* dirent types */
63 #define DT_UNKNOWN     0x0
64 #define DT_FIFO        0x1
65 #define DT_CHR         0x2
66 #define DT_DIR         0x4
67 #define DT_BLK         0x6
68 #define DT_REG         0x8
69 #define DT_LNK         0xa
70 #define DT_SOCK        0xc
71 
72 /* commonly an fd_set represents 256 FDs */
73 #ifndef FD_SETSIZE
74 #define FD_SETSIZE     256
75 #endif
76 
77 /* PATH_MAX and MAXPATHLEN are often used and found with plenty of different
78  * values.
79  */
80 #ifndef PATH_MAX
81 #define PATH_MAX       4096
82 #endif
83 
84 #ifndef MAXPATHLEN
85 #define MAXPATHLEN     (PATH_MAX)
86 #endif
87 
88 /* flags for mmap */
89 #ifndef MAP_FAILED
90 #define MAP_FAILED ((void *)-1)
91 #endif
92 
93 /* whence values for lseek() */
94 #define SEEK_SET       0
95 #define SEEK_CUR       1
96 #define SEEK_END       2
97 
98 /* flags for reboot */
99 #define RB_AUTOBOOT     LINUX_REBOOT_CMD_RESTART
100 #define RB_HALT_SYSTEM  LINUX_REBOOT_CMD_HALT
101 #define RB_ENABLE_CAD   LINUX_REBOOT_CMD_CAD_ON
102 #define RB_DISABLE_CAD  LINUX_REBOOT_CMD_CAD_OFF
103 #define RB_POWER_OFF    LINUX_REBOOT_CMD_POWER_OFF
104 #define RB_SW_SUSPEND   LINUX_REBOOT_CMD_SW_SUSPEND
105 #define RB_KEXEC        LINUX_REBOOT_CMD_KEXEC
106 
107 /* Macros used on waitpid()'s return status */
108 #define WEXITSTATUS(status) (((status) & 0xff00) >> 8)
109 #define WIFEXITED(status)   (((status) & 0x7f) == 0)
110 #define WTERMSIG(status)    ((status) & 0x7f)
111 #define WIFSIGNALED(status) ((status) - 1 < 0xff)
112 
113 /* standard exit() codes */
114 #define EXIT_SUCCESS 0
115 #define EXIT_FAILURE 1
116 
117 #define FD_SETIDXMASK (8 * sizeof(unsigned long))
118 #define FD_SETBITMASK (8 * sizeof(unsigned long)-1)
119 
120 /* for select() */
121 typedef struct {
122 	unsigned long fds[(FD_SETSIZE + FD_SETBITMASK) / FD_SETIDXMASK];
123 } fd_set;
124 
125 #define FD_CLR(fd, set) do {						\
126 		fd_set *__set = (set);					\
127 		int __fd = (fd);					\
128 		if (__fd >= 0)						\
129 			__set->fds[__fd / FD_SETIDXMASK] &=		\
130 				~(1U << (__fd & FX_SETBITMASK));	\
131 	} while (0)
132 
133 #define FD_SET(fd, set) do {						\
134 		fd_set *__set = (set);					\
135 		int __fd = (fd);					\
136 		if (__fd >= 0)						\
137 			__set->fds[__fd / FD_SETIDXMASK] |=		\
138 				1 << (__fd & FD_SETBITMASK);		\
139 	} while (0)
140 
141 #define FD_ISSET(fd, set) ({						\
142 			fd_set *__set = (set);				\
143 			int __fd = (fd);				\
144 		int __r = 0;						\
145 		if (__fd >= 0)						\
146 			__r = !!(__set->fds[__fd / FD_SETIDXMASK] &	\
147 1U << (__fd & FD_SET_BITMASK));						\
148 		__r;							\
149 	})
150 
151 #define FD_ZERO(set) do {						\
152 		fd_set *__set = (set);					\
153 		int __idx;						\
154 		int __size = (FD_SETSIZE+FD_SETBITMASK) / FD_SETIDXMASK;\
155 		for (__idx = 0; __idx < __size; __idx++)		\
156 			__set->fds[__idx] = 0;				\
157 	} while (0)
158 
159 /* for poll() */
160 #define POLLIN          0x0001
161 #define POLLPRI         0x0002
162 #define POLLOUT         0x0004
163 #define POLLERR         0x0008
164 #define POLLHUP         0x0010
165 #define POLLNVAL        0x0020
166 
167 struct pollfd {
168 	int fd;
169 	short int events;
170 	short int revents;
171 };
172 
173 /* for getdents64() */
174 struct linux_dirent64 {
175 	uint64_t       d_ino;
176 	int64_t        d_off;
177 	unsigned short d_reclen;
178 	unsigned char  d_type;
179 	char           d_name[];
180 };
181 
182 /* The format of the struct as returned by the libc to the application, which
183  * significantly differs from the format returned by the stat() syscall flavours.
184  */
185 struct stat {
186 	dev_t     st_dev;     /* ID of device containing file */
187 	ino_t     st_ino;     /* inode number */
188 	mode_t    st_mode;    /* protection */
189 	nlink_t   st_nlink;   /* number of hard links */
190 	uid_t     st_uid;     /* user ID of owner */
191 	gid_t     st_gid;     /* group ID of owner */
192 	dev_t     st_rdev;    /* device ID (if special file) */
193 	off_t     st_size;    /* total size, in bytes */
194 	blksize_t st_blksize; /* blocksize for file system I/O */
195 	blkcnt_t  st_blocks;  /* number of 512B blocks allocated */
196 	union { time_t st_atime; struct timespec st_atim; }; /* time of last access */
197 	union { time_t st_mtime; struct timespec st_mtim; }; /* time of last modification */
198 	union { time_t st_ctime; struct timespec st_ctim; }; /* time of last status change */
199 };
200 
201 /* WARNING, it only deals with the 4096 first majors and 256 first minors */
202 #define makedev(major, minor) ((dev_t)((((major) & 0xfff) << 8) | ((minor) & 0xff)))
203 #define major(dev) ((unsigned int)(((dev) >> 8) & 0xfff))
204 #define minor(dev) ((unsigned int)(((dev) & 0xff))
205 
206 #ifndef offsetof
207 #define offsetof(TYPE, FIELD) ((size_t) &((TYPE *)0)->FIELD)
208 #endif
209 
210 #ifndef container_of
211 #define container_of(PTR, TYPE, FIELD) ({			\
212 	__typeof__(((TYPE *)0)->FIELD) *__FIELD_PTR = (PTR);	\
213 	(TYPE *)((char *) __FIELD_PTR - offsetof(TYPE, FIELD));	\
214 })
215 #endif
216 
217 /* make sure to include all global symbols */
218 #include "nolibc.h"
219 
220 #endif /* _NOLIBC_TYPES_H */
221