types.h

  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/* make sure to include all global symbols */
  8#include "nolibc.h"
  9
 10#ifndef _NOLIBC_TYPES_H
 11#define _NOLIBC_TYPES_H
 12
 13#include "std.h"
 14#include <linux/mman.h>
 15#include <linux/stat.h>
 16#include <linux/time.h>
 17#include <linux/wait.h>
 18
 19
 20/* Only the generic macros and types may be defined here. The arch-specific
 21 * ones such as the O_RDONLY and related macros used by fcntl() and open()
 22 * must not be defined here.
 23 */
 24
 25/* stat flags (WARNING, octal here). We need to check for an existing
 26 * definition because linux/stat.h may omit to define those if it finds
 27 * that any glibc header was already included.
 28 */
 29#if !defined(S_IFMT)
 30#define S_IFDIR        0040000
 31#define S_IFCHR        0020000
 32#define S_IFBLK        0060000
 33#define S_IFREG        0100000
 34#define S_IFIFO        0010000
 35#define S_IFLNK        0120000
 36#define S_IFSOCK       0140000
 37#define S_IFMT         0170000
 38
 39#define S_ISDIR(mode)  (((mode) & S_IFMT) == S_IFDIR)
 40#define S_ISCHR(mode)  (((mode) & S_IFMT) == S_IFCHR)
 41#define S_ISBLK(mode)  (((mode) & S_IFMT) == S_IFBLK)
 42#define S_ISREG(mode)  (((mode) & S_IFMT) == S_IFREG)
 43#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
 44#define S_ISLNK(mode)  (((mode) & S_IFMT) == S_IFLNK)
 45#define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
 46
 47#define S_IRWXU 00700
 48#define S_IRUSR 00400
 49#define S_IWUSR 00200
 50#define S_IXUSR 00100
 51
 52#define S_IRWXG 00070
 53#define S_IRGRP 00040
 54#define S_IWGRP 00020
 55#define S_IXGRP 00010
 56
 57#define S_IRWXO 00007
 58#define S_IROTH 00004
 59#define S_IWOTH 00002
 60#define S_IXOTH 00001
 61#endif
 62
 63/* dirent types */
 64#define DT_UNKNOWN     0x0
 65#define DT_FIFO        0x1
 66#define DT_CHR         0x2
 67#define DT_DIR         0x4
 68#define DT_BLK         0x6
 69#define DT_REG         0x8
 70#define DT_LNK         0xa
 71#define DT_SOCK        0xc
 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/* flags for mmap */
 85#ifndef MAP_FAILED
 86#define MAP_FAILED ((void *)-1)
 87#endif
 88
 89/* whence values for lseek() */
 90#define SEEK_SET       0
 91#define SEEK_CUR       1
 92#define SEEK_END       2
 93
 94/* flags for reboot */
 95#define RB_AUTOBOOT     LINUX_REBOOT_CMD_RESTART
 96#define RB_HALT_SYSTEM  LINUX_REBOOT_CMD_HALT
 97#define RB_ENABLE_CAD   LINUX_REBOOT_CMD_CAD_ON
 98#define RB_DISABLE_CAD  LINUX_REBOOT_CMD_CAD_OFF
 99#define RB_POWER_OFF    LINUX_REBOOT_CMD_POWER_OFF
100#define RB_SW_SUSPEND   LINUX_REBOOT_CMD_SW_SUSPEND
101#define RB_KEXEC        LINUX_REBOOT_CMD_KEXEC
102
103/* Macros used on waitpid()'s return status */
104#define WEXITSTATUS(status) (((status) & 0xff00) >> 8)
105#define WIFEXITED(status)   (((status) & 0x7f) == 0)
106#define WTERMSIG(status)    ((status) & 0x7f)
107#define WIFSIGNALED(status) ((status) - 1 < 0xff)
108
109/* standard exit() codes */
110#define EXIT_SUCCESS 0
111#define EXIT_FAILURE 1
112
113/* for getdents64() */
114struct linux_dirent64 {
115	uint64_t       d_ino;
116	int64_t        d_off;
117	unsigned short d_reclen;
118	unsigned char  d_type;
119	char           d_name[];
120};
121
122/* The format of the struct as returned by the libc to the application, which
123 * significantly differs from the format returned by the stat() syscall flavours.
124 */
125struct stat {
126	dev_t     st_dev;     /* ID of device containing file */
127	ino_t     st_ino;     /* inode number */
128	mode_t    st_mode;    /* protection */
129	nlink_t   st_nlink;   /* number of hard links */
130	uid_t     st_uid;     /* user ID of owner */
131	gid_t     st_gid;     /* group ID of owner */
132	dev_t     st_rdev;    /* device ID (if special file) */
133	off_t     st_size;    /* total size, in bytes */
134	blksize_t st_blksize; /* blocksize for file system I/O */
135	blkcnt_t  st_blocks;  /* number of 512B blocks allocated */
136	union { time_t st_atime; struct timespec st_atim; }; /* time of last access */
137	union { time_t st_mtime; struct timespec st_mtim; }; /* time of last modification */
138	union { time_t st_ctime; struct timespec st_ctim; }; /* time of last status change */
139};
140
141typedef __kernel_clockid_t clockid_t;
142typedef int timer_t;
143
144#ifndef container_of
145#define container_of(PTR, TYPE, FIELD) ({			\
146	__typeof__(((TYPE *)0)->FIELD) *__FIELD_PTR = (PTR);	\
147	(TYPE *)((char *) __FIELD_PTR - offsetof(TYPE, FIELD));	\
148})
149#endif
150
151#endif /* _NOLIBC_TYPES_H */