FreeBSD/Linux Kernel Cross Reference
sys/sys/unistd.h
1 /* $NetBSD: unistd.h,v 1.32 2005/01/25 23:55:21 wrstuden Exp $ */
2
3 /*
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)unistd.h 8.2 (Berkeley) 1/7/94
32 */
33
34 #ifndef _SYS_UNISTD_H_
35 #define _SYS_UNISTD_H_
36
37 #include <sys/featuretest.h>
38
39 /* compile-time symbolic constants */
40 #define _POSIX_JOB_CONTROL /* implementation supports job control */
41
42 /*
43 * According to POSIX 1003.1:
44 * "The saved set-user-ID capability allows a program to regain the
45 * effective user ID established at the last exec call."
46 * However, the setuid/setgid function as specified by POSIX 1003.1 does
47 * not allow changing the effective ID from the super-user without also
48 * changed the saved ID, so it is impossible to get super-user privileges
49 * back later. Instead we provide this feature independent of the current
50 * effective ID through the seteuid/setegid function. In addition, we do
51 * not use the saved ID as specified by POSIX 1003.1 in setuid/setgid,
52 * because this would make it impossible for a set-user-ID executable
53 * owned by a user other than the super-user to permanently revoke its
54 * extra privileges.
55 */
56 #ifdef _NOT_AVAILABLE
57 #define _POSIX_SAVED_IDS /* saved set-user-ID and set-group-ID */
58 #endif
59
60 #define _POSIX_VERSION 199009L
61 #define _POSIX2_VERSION 199212L
62
63 /* execution-time symbolic constants */
64 /* chown requires appropriate privileges */
65 #define _POSIX_CHOWN_RESTRICTED 1
66 /* too-long path components generate errors */
67 #define _POSIX_NO_TRUNC 1
68 /* may disable terminal special characters */
69 #define _POSIX_VDISABLE ((unsigned char)'\377')
70 /* file synchronization is available */
71 #define _POSIX_FSYNC 1
72 /* synchronized I/O is available */
73 #define _POSIX_SYNCHRONIZED_IO 1
74 /* memory mapped files */
75 #define _POSIX_MAPPED_FILES 1
76 /* memory locking of whole address space */
77 #define _POSIX_MEMLOCK 1
78 /* memory locking address ranges */
79 #define _POSIX_MEMLOCK_RANGE 1
80 /* memory access protections */
81 #define _POSIX_MEMORY_PROTECTION 1
82 /* monotonic clock */
83 #define _POSIX_MONOTONIC_CLOCK 200112L
84 /* threads */
85 #define _POSIX_THREADS 200112L
86 /* semaphores */
87 #define _POSIX_SEMAPHORES 0
88 /* barriers */
89 #define _POSIX_BARRIERS 200112L
90 /* timers */
91 #define _POSIX_TIMERS 200112L
92 /* spin locks */
93 #define _POSIX_SPIN_LOCKS 200112L
94 /* read/write locks */
95 #define _POSIX_READER_WRITER_LOCKS 200112L
96 /* XPG4.2 shared memory */
97 #define _XOPEN_SHM 0
98
99 /* access function */
100 #define F_OK 0 /* test for existence of file */
101 #define X_OK 0x01 /* test for execute or search permission */
102 #define W_OK 0x02 /* test for write permission */
103 #define R_OK 0x04 /* test for read permission */
104
105 /* whence values for lseek(2) */
106 #define SEEK_SET 0 /* set file offset to offset */
107 #define SEEK_CUR 1 /* set file offset to current plus offset */
108 #define SEEK_END 2 /* set file offset to EOF plus offset */
109
110 #if defined(_NETBSD_SOURCE)
111 /* whence values for lseek(2); renamed by POSIX 1003.1 */
112 #define L_SET SEEK_SET
113 #define L_INCR SEEK_CUR
114 #define L_XTND SEEK_END
115
116 /*
117 * fsync_range values.
118 *
119 * Note the following flag values were chosen to not overlap
120 * values for SEEK_XXX flags. While not currently implemented,
121 * it is possible to extend this call to respect SEEK_CUR and
122 * SEEK_END offset addressing modes.
123 */
124 #define FDATASYNC 0x0010 /* sync data and minimal metadata */
125 #define FFILESYNC 0x0020 /* sync data and metadata */
126 #define FDISKSYNC 0x0040 /* flush disk caches after sync */
127 #endif
128
129 /* configurable pathname variables; use as argument to pathconf(3) */
130 #define _PC_LINK_MAX 1
131 #define _PC_MAX_CANON 2
132 #define _PC_MAX_INPUT 3
133 #define _PC_NAME_MAX 4
134 #define _PC_PATH_MAX 5
135 #define _PC_PIPE_BUF 6
136 #define _PC_CHOWN_RESTRICTED 7
137 #define _PC_NO_TRUNC 8
138 #define _PC_VDISABLE 9
139 #define _PC_SYNC_IO 10
140 #define _PC_FILESIZEBITS 11
141
142 /* configurable system variables; use as argument to sysconf(3) */
143 /*
144 * XXX The value of _SC_CLK_TCK is embedded in <time.h>.
145 * XXX The value of _SC_PAGESIZE is embedded in <sys/shm.h>.
146 */
147 #define _SC_ARG_MAX 1
148 #define _SC_CHILD_MAX 2
149 #define _O_SC_CLK_TCK 3 /* Old version, always 100 */
150 #define _SC_NGROUPS_MAX 4
151 #define _SC_OPEN_MAX 5
152 #define _SC_JOB_CONTROL 6
153 #define _SC_SAVED_IDS 7
154 #define _SC_VERSION 8
155 #define _SC_BC_BASE_MAX 9
156 #define _SC_BC_DIM_MAX 10
157 #define _SC_BC_SCALE_MAX 11
158 #define _SC_BC_STRING_MAX 12
159 #define _SC_COLL_WEIGHTS_MAX 13
160 #define _SC_EXPR_NEST_MAX 14
161 #define _SC_LINE_MAX 15
162 #define _SC_RE_DUP_MAX 16
163 #define _SC_2_VERSION 17
164 #define _SC_2_C_BIND 18
165 #define _SC_2_C_DEV 19
166 #define _SC_2_CHAR_TERM 20
167 #define _SC_2_FORT_DEV 21
168 #define _SC_2_FORT_RUN 22
169 #define _SC_2_LOCALEDEF 23
170 #define _SC_2_SW_DEV 24
171 #define _SC_2_UPE 25
172 #define _SC_STREAM_MAX 26
173 #define _SC_TZNAME_MAX 27
174 #define _SC_PAGESIZE 28
175 #define _SC_PAGE_SIZE _SC_PAGESIZE /* 1170 compatibility */
176 #define _SC_FSYNC 29
177 #define _SC_XOPEN_SHM 30
178 #define _SC_SYNCHRONIZED_IO 31
179 #define _SC_IOV_MAX 32
180 #define _SC_MAPPED_FILES 33
181 #define _SC_MEMLOCK 34
182 #define _SC_MEMLOCK_RANGE 35
183 #define _SC_MEMORY_PROTECTION 36
184 #define _SC_LOGIN_NAME_MAX 37
185 #define _SC_MONOTONIC_CLOCK 38
186 #define _SC_CLK_TCK 39 /* New, variable version */
187 #define _SC_ATEXIT_MAX 40
188 #define _SC_THREADS 41
189 #define _SC_SEMAPHORES 42
190 #define _SC_BARRIERS 43
191 #define _SC_TIMERS 44
192 #define _SC_SPIN_LOCKS 45
193 #define _SC_READER_WRITER_LOCKS 46
194 #define _SC_GETGR_R_SIZE_MAX 47
195 #define _SC_GETPW_R_SIZE_MAX 48
196
197 /* configurable system strings */
198 #define _CS_PATH 1
199
200 #endif /* !_SYS_UNISTD_H_ */
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