unistd.h

 1/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
 2/*
 3 * unistd function definitions for NOLIBC
 4 * Copyright (C) 2017-2022 Willy Tarreau <w@1wt.eu>
 5 */
 6
 7/* make sure to include all global symbols */
 8#include "nolibc.h"
 9
10#ifndef _NOLIBC_UNISTD_H
11#define _NOLIBC_UNISTD_H
12
13#include "std.h"
14#include "arch.h"
15#include "types.h"
16#include "sys.h"
17
18
19#define STDIN_FILENO  0
20#define STDOUT_FILENO 1
21#define STDERR_FILENO 2
22
23#define F_OK 0
24#define X_OK 1
25#define W_OK 2
26#define R_OK 4
27
28/*
29 * int access(const char *path, int amode);
30 * int faccessat(int fd, const char *path, int amode, int flag);
31 */
32
33static __attribute__((unused))
34int sys_faccessat(int fd, const char *path, int amode, int flag)
35{
36	return my_syscall4(__NR_faccessat, fd, path, amode, flag);
37}
38
39static __attribute__((unused))
40int faccessat(int fd, const char *path, int amode, int flag)
41{
42	return __sysret(sys_faccessat(fd, path, amode, flag));
43}
44
45static __attribute__((unused))
46int access(const char *path, int amode)
47{
48	return faccessat(AT_FDCWD, path, amode, 0);
49}
50
51
52static __attribute__((unused))
53int msleep(unsigned int msecs)
54{
55	struct timeval my_timeval = { msecs / 1000, (msecs % 1000) * 1000 };
56
57	if (sys_select(0, NULL, NULL, NULL, &my_timeval) < 0)
58		return (my_timeval.tv_sec * 1000) +
59			(my_timeval.tv_usec / 1000) +
60			!!(my_timeval.tv_usec % 1000);
61	else
62		return 0;
63}
64
65static __attribute__((unused))
66unsigned int sleep(unsigned int seconds)
67{
68	struct timeval my_timeval = { seconds, 0 };
69
70	if (sys_select(0, NULL, NULL, NULL, &my_timeval) < 0)
71		return my_timeval.tv_sec + !!my_timeval.tv_usec;
72	else
73		return 0;
74}
75
76static __attribute__((unused))
77int usleep(unsigned int usecs)
78{
79	struct timeval my_timeval = { usecs / 1000000, usecs % 1000000 };
80
81	return sys_select(0, NULL, NULL, NULL, &my_timeval);
82}
83
84static __attribute__((unused))
85int tcsetpgrp(int fd, pid_t pid)
86{
87	return ioctl(fd, TIOCSPGRP, &pid);
88}
89
90#endif /* _NOLIBC_UNISTD_H */