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haiku/headers/posix/unistd.h
Leorize b9c25b0d0e unistd: introduce nice() 
This commit implements nice() as specified in POSIX.1-2008.

Fixes #4932.

Change-Id: Ibd8d4636d9e3a8adf0f26a081d5b1180f0cbb839
Reviewed-on: https://review.haiku-os.org/c/863
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
2019-01-19 18:31:58 +00:00

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/*
* Copyright 2004-2015 Haiku, Inc. All Rights Reserved.
* Distributed under the terms of the MIT License.
*/
#ifndef _UNISTD_H_
#define _UNISTD_H_
#include <null.h>
#include <stdint.h>
#include <sys/types.h>
/* access modes */
#define R_OK 4
#define W_OK 2
#define X_OK 1
#define F_OK 0
/* standard file descriptors */
#define STDIN_FILENO 0
#define STDOUT_FILENO 1
#define STDERR_FILENO 2
/* function arguments needed by lockf() */
#define F_ULOCK 0 /* unlock locked sections */
#define F_LOCK 1 /* lock a section for exclusive use */
#define F_TLOCK 2 /* test and lock a section for exclusive use */
#define F_TEST 3 /* test a section for locks by other processes */
/* POSIX version support */
#define _POSIX_VERSION (199009L) /* TODO: Update! */
#define _POSIX_CHOWN_RESTRICTED 1
#define _POSIX_JOB_CONTROL 1
#define _POSIX_NO_TRUNC 0
#define _POSIX_SAVED_IDS 1
#define _POSIX_VDISABLE ((unsigned char)-2)
/* TODO: Check this! */
/* TODO: Update these to the current POSIX version! Ideally after actually
supporting the features. */
#define _POSIX_BARRIERS (200112L)
#define _POSIX_SEMAPHORES (200112L)
#define _POSIX_THREADS (200112L)
#define _POSIX_MAPPED_FILES (200809L)
#define _POSIX_THREAD_PROCESS_SHARED (200809L)
#define _POSIX_THREAD_ATTR_STACKADDR (-1) /* currently unsupported */
#define _POSIX_THREAD_ATTR_STACKSIZE (200809L)
#define _POSIX_THREAD_PRIORITY_SCHEDULING (-1) /* currently unsupported */
#define _POSIX_REALTIME_SIGNALS (200809L)
#define _POSIX_MEMORY_PROTECTION (200809L)
#define _POSIX_MONOTONIC_CLOCK (200809L)
#define _POSIX_TIMERS (200809L)
#define _POSIX_CPUTIME (200809L)
#define _POSIX_THREAD_CPUTIME (200809L)
/* pathconf() constants */
/* BeOS supported values, do not touch */
#define _PC_CHOWN_RESTRICTED 1
#define _PC_MAX_CANON 2
#define _PC_MAX_INPUT 3
#define _PC_NAME_MAX 4
#define _PC_NO_TRUNC 5
#define _PC_PATH_MAX 6
#define _PC_PIPE_BUF 7
#define _PC_VDISABLE 8
#define _PC_LINK_MAX 25
/* new values */
#define _PC_SYNC_IO 26
#define _PC_ASYNC_IO 27
#define _PC_PRIO_IO 28
#define _PC_SOCK_MAXBUF 29
#define _PC_FILESIZEBITS 30
#define _PC_REC_INCR_XFER_SIZE 31
#define _PC_REC_MAX_XFER_SIZE 32
#define _PC_REC_MIN_XFER_SIZE 33
#define _PC_REC_XFER_ALIGN 34
#define _PC_ALLOC_SIZE_MIN 35
#define _PC_SYMLINK_MAX 36
#define _PC_2_SYMLINKS 37
#define _PC_XATTR_EXISTS 38
#define _PC_XATTR_ENABLED 39
/* sysconf() constants */
/* BeOS supported values, do not touch */
#define _SC_ARG_MAX 15
#define _SC_CHILD_MAX 16
#define _SC_CLK_TCK 17
#define _SC_JOB_CONTROL 18
#define _SC_NGROUPS_MAX 19
#define _SC_OPEN_MAX 20
#define _SC_SAVED_IDS 21
#define _SC_STREAM_MAX 22
#define _SC_TZNAME_MAX 23
#define _SC_VERSION 24
/* new values */
#define _SC_GETGR_R_SIZE_MAX 25
#define _SC_GETPW_R_SIZE_MAX 26
#define _SC_PAGE_SIZE 27
#define _SC_PAGESIZE _SC_PAGE_SIZE
#define _SC_SEM_NSEMS_MAX 28
#define _SC_SEM_VALUE_MAX 29
#define _SC_SEMAPHORES 30
#define _SC_THREADS 31
/* TODO: check */
#define _SC_IOV_MAX 32
#define _SC_UIO_MAXIOV _SC_IOV_MAX
#define _SC_NPROCESSORS_CONF 34
#define _SC_NPROCESSORS_ONLN 35
#define _SC_ATEXIT_MAX 37
#define _SC_PASS_MAX 39
#define _SC_PHYS_PAGES 40
#define _SC_AVPHYS_PAGES 41
#define _SC_PIPE 42
#define _SC_SELECT 43
#define _SC_POLL 44
#define _SC_MAPPED_FILES 45
#define _SC_THREAD_PROCESS_SHARED 46
#define _SC_THREAD_STACK_MIN 47
#define _SC_THREAD_ATTR_STACKADDR 48
#define _SC_THREAD_ATTR_STACKSIZE 49
#define _SC_THREAD_PRIORITY_SCHEDULING 50
#define _SC_REALTIME_SIGNALS 51
#define _SC_MEMORY_PROTECTION 52
#define _SC_SIGQUEUE_MAX 53
#define _SC_RTSIG_MAX 54
#define _SC_MONOTONIC_CLOCK 55
#define _SC_DELAYTIMER_MAX 56
#define _SC_TIMER_MAX 57
#define _SC_TIMERS 58
#define _SC_CPUTIME 59
#define _SC_THREAD_CPUTIME 60
/* confstr() constants */
#define _CS_PATH 1
/* lseek() constants */
#ifndef SEEK_SET
# define SEEK_SET 0
#endif
#ifndef SEEK_CUR
# define SEEK_CUR 1
#endif
#ifndef SEEK_END
# define SEEK_END 2
#endif
#ifdef __cplusplus
extern "C" {
#endif
/* file functions */
extern int access(const char *path, int accessMode);
extern int faccessat(int fd, const char *path, int accessMode, int flag);
extern int chdir(const char *path);
extern int fchdir(int fd);
extern char *getcwd(char *buffer, size_t size);
extern int pipe(int fildes[2]);
extern int dup(int fd);
extern int dup2(int fd1, int fd2);
extern int close(int fd);
extern int link(const char *toPath, const char *path);
extern int linkat(int toFD, const char *toPath, int pathFD,
const char *path, int flag);
extern int unlink(const char *name);
extern int unlinkat(int fd, const char *path, int flag);
extern int rmdir(const char *path);
extern ssize_t readlink(const char *path, char *buffer, size_t bufferSize);
extern ssize_t readlinkat(int fd, const char *path, char *buffer,
size_t bufferSize);
extern int symlink(const char *toPath, const char *symlinkPath);
extern int symlinkat(const char *toPath, int fd, const char *symlinkPath);
extern int ftruncate(int fd, off_t newSize);
extern int truncate(const char *path, off_t newSize);
extern int ioctl(int fd, unsigned long op, ...);
extern ssize_t read(int fd, void *buffer, size_t count);
extern ssize_t read_pos(int fd, off_t pos, void *buffer, size_t count);
extern ssize_t pread(int fd, void *buffer, size_t count, off_t pos);
extern ssize_t write(int fd, const void *buffer, size_t count);
extern ssize_t write_pos(int fd, off_t pos, const void *buffer,size_t count);
extern ssize_t pwrite(int fd, const void *buffer, size_t count, off_t pos);
extern off_t lseek(int fd, off_t offset, int whence);
extern void sync(void);
extern int fsync(int fd);
extern int chown(const char *path, uid_t owner, gid_t group);
extern int fchown(int fd, uid_t owner, gid_t group);
extern int lchown(const char *path, uid_t owner, gid_t group);
extern int fchownat(int fd, const char *path, uid_t owner, gid_t group,
int flag);
extern int getpagesize(void);
extern int getdtablesize(void);
extern long sysconf(int name);
extern long fpathconf(int fd, int name);
extern long pathconf(const char *path, int name);
extern size_t confstr(int name, char *buf, size_t len);
extern int lockf(int fd, int function, off_t size);
/* process functions */
extern pid_t fork(void);
extern pid_t vfork(void);
extern int execve(const char *path, char * const argv[],
char *const environment[]);
extern int execl(const char *path, const char *arg, ...);
extern int execv(const char *path, char *const argv[]);
extern int execlp(const char *file, const char *arg, ...);
extern int execle(const char *path, const char *arg , ... /*, char **envp */);
extern int execvp(const char *file, char *const argv[]);
extern int execvpe(const char *file, char *const argv[],
char *const environment[]);
extern void _exit(int status) __attribute__ ((noreturn));
extern pid_t tcgetpgrp(int fd);
extern int tcsetpgrp(int fd, pid_t pgrpid);
extern int brk(void *addr);
extern void *sbrk(intptr_t increment);
extern unsigned int alarm(unsigned int seconds);
extern useconds_t ualarm(useconds_t microSeconds, useconds_t interval);
extern unsigned int sleep(unsigned int seconds);
extern int usleep(unsigned int microSeconds);
extern int pause(void);
/* process */
extern pid_t getpid(void);
extern pid_t getpgrp(void);
extern pid_t getppid(void);
extern pid_t getsid(pid_t pid);
extern pid_t getpgid(pid_t pid);
extern pid_t setsid(void);
extern int setpgid(pid_t pid, pid_t pgid);
extern pid_t setpgrp(void);
extern int chroot(const char *path);
extern int nice(int incr);
/* access permissions */
extern gid_t getegid(void);
extern uid_t geteuid(void);
extern gid_t getgid(void);
extern uid_t getuid(void);
extern int setgid(gid_t gid);
extern int setuid(uid_t uid);
extern int setegid(gid_t gid);
extern int seteuid(uid_t uid);
extern int setregid(gid_t rgid, gid_t egid);
extern int setreuid(uid_t ruid, uid_t euid);
extern int getgrouplist(const char* user, gid_t baseGroup,
gid_t* groupList, int* groupCount);
extern int getgroups(int groupCount, gid_t groupList[]);
extern int initgroups(const char* user, gid_t baseGroup);
extern int setgroups(int groupCount, const gid_t* groupList);
extern char *getlogin(void);
extern int getlogin_r(char *name, size_t nameSize);
/* host name */
extern int sethostname(const char *hostName, size_t nameSize);
extern int gethostname(char *hostName, size_t nameSize);
/* tty */
extern int isatty(int fd);
extern char *ttyname(int fd);
extern int ttyname_r(int fd, char *buffer, size_t bufferSize);
/* misc */
extern char *crypt(const char *key, const char *salt);
extern void encrypt(char block[64], int edflag);
extern int getopt(int argc, char *const *argv, const char *shortOpts);
extern void swab(const void *src, void *dest, ssize_t nbytes);
/* getopt() related external variables */
extern char *optarg;
extern int optind, opterr, optopt;
#ifdef __cplusplus
}
#endif
#endif /* _UNISTD_H_ */
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