types.h (6248B)
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 13 14/* Only the generic macros and types may be defined here. The arch-specific 15 * ones such as the O_RDONLY and related macros used by fcntl() and open(), or 16 * the layout of sys_stat_struct must not be defined here. 17 */ 18 19/* stat flags (WARNING, octal here) */ 20#define S_IFDIR 0040000 21#define S_IFCHR 0020000 22#define S_IFBLK 0060000 23#define S_IFREG 0100000 24#define S_IFIFO 0010000 25#define S_IFLNK 0120000 26#define S_IFSOCK 0140000 27#define S_IFMT 0170000 28 29#define S_ISDIR(mode) (((mode) & S_IFDIR) == S_IFDIR) 30#define S_ISCHR(mode) (((mode) & S_IFCHR) == S_IFCHR) 31#define S_ISBLK(mode) (((mode) & S_IFBLK) == S_IFBLK) 32#define S_ISREG(mode) (((mode) & S_IFREG) == S_IFREG) 33#define S_ISFIFO(mode) (((mode) & S_IFIFO) == S_IFIFO) 34#define S_ISLNK(mode) (((mode) & S_IFLNK) == S_IFLNK) 35#define S_ISSOCK(mode) (((mode) & S_IFSOCK) == S_IFSOCK) 36 37/* dirent types */ 38#define DT_UNKNOWN 0x0 39#define DT_FIFO 0x1 40#define DT_CHR 0x2 41#define DT_DIR 0x4 42#define DT_BLK 0x6 43#define DT_REG 0x8 44#define DT_LNK 0xa 45#define DT_SOCK 0xc 46 47/* commonly an fd_set represents 256 FDs */ 48#ifndef FD_SETSIZE 49#define FD_SETSIZE 256 50#endif 51 52/* PATH_MAX and MAXPATHLEN are often used and found with plenty of different 53 * values. 54 */ 55#ifndef PATH_MAX 56#define PATH_MAX 4096 57#endif 58 59#ifndef MAXPATHLEN 60#define MAXPATHLEN (PATH_MAX) 61#endif 62 63/* Special FD used by all the *at functions */ 64#ifndef AT_FDCWD 65#define AT_FDCWD (-100) 66#endif 67 68/* whence values for lseek() */ 69#define SEEK_SET 0 70#define SEEK_CUR 1 71#define SEEK_END 2 72 73/* cmd for reboot() */ 74#define LINUX_REBOOT_MAGIC1 0xfee1dead 75#define LINUX_REBOOT_MAGIC2 0x28121969 76#define LINUX_REBOOT_CMD_HALT 0xcdef0123 77#define LINUX_REBOOT_CMD_POWER_OFF 0x4321fedc 78#define LINUX_REBOOT_CMD_RESTART 0x01234567 79#define LINUX_REBOOT_CMD_SW_SUSPEND 0xd000fce2 80 81/* Macros used on waitpid()'s return status */ 82#define WEXITSTATUS(status) (((status) & 0xff00) >> 8) 83#define WIFEXITED(status) (((status) & 0x7f) == 0) 84 85/* waitpid() flags */ 86#define WNOHANG 1 87 88/* standard exit() codes */ 89#define EXIT_SUCCESS 0 90#define EXIT_FAILURE 1 91 92/* for select() */ 93typedef struct { 94 uint32_t fd32[(FD_SETSIZE + 31) / 32]; 95} fd_set; 96 97#define FD_CLR(fd, set) do { \ 98 fd_set *__set = (set); \ 99 int __fd = (fd); \ 100 if (__fd >= 0) \ 101 __set->fd32[__fd / 32] &= ~(1U << (__fd & 31)); \ 102 } while (0) 103 104#define FD_SET(fd, set) do { \ 105 fd_set *__set = (set); \ 106 int __fd = (fd); \ 107 if (__fd >= 0) \ 108 __set->fd32[__fd / 32] |= 1U << (__fd & 31); \ 109 } while (0) 110 111#define FD_ISSET(fd, set) ({ \ 112 fd_set *__set = (set); \ 113 int __fd = (fd); \ 114 int __r = 0; \ 115 if (__fd >= 0) \ 116 __r = !!(__set->fd32[__fd / 32] & 1U << (__fd & 31)); \ 117 __r; \ 118 }) 119 120#define FD_ZERO(set) do { \ 121 fd_set *__set = (set); \ 122 int __idx; \ 123 for (__idx = 0; __idx < (FD_SETSIZE+31) / 32; __idx ++) \ 124 __set->fd32[__idx] = 0; \ 125 } while (0) 126 127/* for poll() */ 128#define POLLIN 0x0001 129#define POLLPRI 0x0002 130#define POLLOUT 0x0004 131#define POLLERR 0x0008 132#define POLLHUP 0x0010 133#define POLLNVAL 0x0020 134 135struct pollfd { 136 int fd; 137 short int events; 138 short int revents; 139}; 140 141/* for getdents64() */ 142struct linux_dirent64 { 143 uint64_t d_ino; 144 int64_t d_off; 145 unsigned short d_reclen; 146 unsigned char d_type; 147 char d_name[]; 148}; 149 150/* needed by wait4() */ 151struct rusage { 152 struct timeval ru_utime; 153 struct timeval ru_stime; 154 long ru_maxrss; 155 long ru_ixrss; 156 long ru_idrss; 157 long ru_isrss; 158 long ru_minflt; 159 long ru_majflt; 160 long ru_nswap; 161 long ru_inblock; 162 long ru_oublock; 163 long ru_msgsnd; 164 long ru_msgrcv; 165 long ru_nsignals; 166 long ru_nvcsw; 167 long ru_nivcsw; 168}; 169 170/* The format of the struct as returned by the libc to the application, which 171 * significantly differs from the format returned by the stat() syscall flavours. 172 */ 173struct stat { 174 dev_t st_dev; /* ID of device containing file */ 175 ino_t st_ino; /* inode number */ 176 mode_t st_mode; /* protection */ 177 nlink_t st_nlink; /* number of hard links */ 178 uid_t st_uid; /* user ID of owner */ 179 gid_t st_gid; /* group ID of owner */ 180 dev_t st_rdev; /* device ID (if special file) */ 181 off_t st_size; /* total size, in bytes */ 182 blksize_t st_blksize; /* blocksize for file system I/O */ 183 blkcnt_t st_blocks; /* number of 512B blocks allocated */ 184 time_t st_atime; /* time of last access */ 185 time_t st_mtime; /* time of last modification */ 186 time_t st_ctime; /* time of last status change */ 187}; 188 189/* WARNING, it only deals with the 4096 first majors and 256 first minors */ 190#define makedev(major, minor) ((dev_t)((((major) & 0xfff) << 8) | ((minor) & 0xff))) 191#define major(dev) ((unsigned int)(((dev) >> 8) & 0xfff)) 192#define minor(dev) ((unsigned int)(((dev) & 0xff)) 193 194#ifndef offsetof 195#define offsetof(TYPE, FIELD) ((size_t) &((TYPE *)0)->FIELD) 196#endif 197 198#ifndef container_of 199#define container_of(PTR, TYPE, FIELD) ({ \ 200 __typeof__(((TYPE *)0)->FIELD) *__FIELD_PTR = (PTR); \ 201 (TYPE *)((char *) __FIELD_PTR - offsetof(TYPE, FIELD)); \ 202}) 203#endif 204 205#endif /* _NOLIBC_TYPES_H */