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haiku/headers/posix/unistd.h
Jérôme Duval 7065a89fc6 POSIX: ioctl(fd, op, arg) equals ioctl(fd, op, arg, 0) 
The ioctl call cannot know the expected number of arguments
because it depends on the specific ioctl being used, and the
same value could be used to do different things by different
devices. Without knowing that, it is not safe to use va_arg
(at best a random value will be read from the stack, at worst,
it will just crash).

This changes the implementation of ioctl in two ways:
- For C++ code: a 4 argument function with default values
  for arguments 3 and 4.
- For C code: wrap arguments 3 and 4 in a struct with the
  help of a macro, providing something that behaves like the
  C++ version.

So, with this new code:
- Calling ioctl with only 3 arguments sets the 4th one to 0
- Calling ioctl with only 2 arguments sets the 3rd and 4th to 0
- Calling with 1 or 5+ arguments is a compile time error

The existing ioctl symbol is preserved for ABI compatibility.

Change-Id: I6d4d1d38fccd8cc9bd94203d3e11aeac6da8efc3
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3360
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
2021-05-04 19:21:48 +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 (200809L)
#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
#define _SC_HOST_NAME_MAX 61
#define _SC_REGEXP 62
#define _SC_SYMLOOP_MAX 63
#define _SC_SHELL 64
#define _SC_TTY_NAME_MAX 65
/* 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
#ifndef SEEK_DATA
# define SEEK_DATA 3
#endif
#ifndef SEEK_HOLE
# define SEEK_HOLE 4
#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);
struct ioctl_args {
void* argument;
size_t size;
};
int __ioctl(int fd, ulong cmd, struct ioctl_args args);
#ifndef __cplusplus
extern int ioctl(int fd, unsigned long op, ...);
#ifndef _KERNEL_MODE
#define ioctl(a, b, c...) __ioctl(a, b, (struct ioctl_args){ c })
#endif
#else
inline int
ioctl(int fd, unsigned long op, void* argument = NULL, size_t size = 0)
{
return __ioctl(fd, op, (struct ioctl_args){ argument, size });
}
#endif
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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