1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/**
* slibc — Yet another C library
* Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _UNISTD_H
#define _UNISTD_H
#include <slibc/version.h>
#include <slibc/features.h>
#define __NEED_size_t
#define __NEED_ssize_t
#define __NEED_uid_t /* TODO not implement */
#define __NEED_gid_t /* TODO not implement */
#define __NEED_off_t /* TODO not implement */
#define __NEED_pid_t /* TODO not implement */
#define __NEED_ptrdiff_t
#define __NEED_intptr_t
#define __NEED_useconds_t /* TODO not implement */
#include <bits/types.h>
/**
* `NULL`'s canonical header is <stddef.h>.
*/
#ifndef NULL
# define NULL ((void*)0)
#endif
/**
* The file descriptor for stdin.
* The file with input.
*/
#define STDIN_FILENO 0
/**
* The file descriptor for stdout.
* The file for output.
*/
#define STDOUT_FILENO 1
/**
* The file descriptor for stderr.
* The file for error messages and warnings.
*/
#define STDERR_FILENO 2
/**
* Set the high end of the calling process's
* data segment.
*
* The high end is defined as the last byte
* in the segment plus 1.
*
* Using `brk` is highly discouraged. `malloc`,
* `calloc` and `free`, and its related functions,
* fall be used instead as they are much more
* conformable. Use of `brk` can couse errors
* when using `malloc`, `free`, &c. Thus, `brk`
* shall (bascially) only be used if you are
* writting an alterantive malloc-implementation.
*
* `brk` was marked LEGACY in SUSv2, and it
* was removed from the POSIX standard in revision
* POSIX.1-2001. It is however fundamental in
* implementing a fast `malloc`-implementation.
*
* @param address The process's new high end of its data segment.
* If lower than the current low end, nothing will
* happen and the function will return with a success
* status.
* @return Zero on succes, -1 on error. On error, `errno`
* is set to indicate the error.
*
* @throws ENOMEM The process can allocate the requested amount
* of memory. Either the process store limit would
* have been exceeded, RAM and swap memory would
* have been exhausted, or the request would cause
* the data segment to overlap another segment.
*/
int brk(void*) /* TODO implement brk */
__GCC_ONLY(__attribute__((warn_unused_result)));
/**
* Set and get the current high end of the calling
* process's data segment.
*
* There is some documents that state that the new,
* rather than the previous, high end is returned.
* Additionally, some documentions do not document
* possible failure. Thus only `sbrk(0)` is guaranteed
* to be portable. The return type differs between
* implementations; common return types are `int`,
* `ssize_t`, `ptrdiff_t`, `ptrdiff_t`, `intptr_t`,
* and `void*`. Note that `int` is
* microarchitecture-portable.
*
* `sbrk` was marked LEGACY in SUSv2, and it
* was removed from the POSIX standard in revision
* POSIX.1-2001. It is however fundamental in
* implementing a fast `malloc`-implementation.
*
* @param delta The incremant of the size of the data segment,
* zero means that the high end shall not be moved
* (thus the current high end is returned,) a
* positive value will cause the segment to grow,
* a negative value will cause the segment to shrink.
* @return The previous high end. `(void*)-1` is returned on error.
*
* @throws ENOMEM The process can allocate the requested amount
* of memory. Either the process store limit would
* have been exceeded, RAM and swap memory would
* have been exhausted, or the request would cause
* the data segment to overlap another segment.
*/
void* sbrk(ptrdiff_t) /* TODO implement sbrk */
__GCC_ONLY(__attribute__((warn_unused_result)));
/* TODO implement exit-functions */
void _exit(int) __noreturn;
/* TODO implement I/O */
int isatty(int);
#endif
|
