Linux 系统调用

Jasonangel
发布于 2022-10-25 21:20:01
9.8K0
发布于 2022-10-25 21:20:01
文章被收录于专栏：嵌入式Linux系统开发
在现代操作系统中，内核提供了用户进程与内核进行交互的一组接口。这些接口让应用程序受限地访问硬件设备，提供了创建新进程并与已有进程进行通信的机制，也提供了申请操作系统其他资源的能力。
这些接口在应用程序和内核之间扮演了使者的角色，应用程序发出各种请求，而内核负责满足这些请求(或者无法满足时返回一个错误)。实际上提供这些接口主要是为了保证系统稳定可靠，避免应用程序恣意妄行。
与内核通信

系统调用在用户空间进程和硬件设备之间添加了一个中间层。该层主要作用有三个。
首先，它为用户空间提供了一种硬件的抽象接口。举例来说，当需要读写文件的时候，应用程序就可以不去管磁盘类型和介质，甚至不用去管文件所在的文件系统到底是哪种类型。
第二，系统调用保证了系统的稳定和安全。作为硬件设备和应用程序之间的中间人，内核可以基于权限、用户类型和其他一些规则对需要进行的访问进行裁决。举例来说，这样可以避免应用程序不正确地使用硬件设备，窃取其他进程的资源，或做出其他危害系统的事情。
第三，每个进程都运行在虚拟系统中，而在用户空间和系统的其余部分提供这样一层公共接口，也是出于这种考虑。如果应用程序可以随意访问硬件而内核又对此一无所知的话，几乎就没法实现多任务和虚拟内存，当然也不可能实现良好的稳定性和安全性。
在 Linux 中，系统调用是用户空间访问内核的唯一手段﹔除异常和陷入外，它们是内核唯一的合法入口。实际上，其他的像设备文件和/proc之类的方式，最终也还是要通过系统调用进行访问的。而有趣的是，Linux 提供的系统调用却比大部分操作系统都少得多。
要访问系统调用（在 Linux 中常称作 syscall)，通常通过C库中定义的函数调用来进行。它们通常都需要定义零个、一个或几个参数（输入）而且可能产生一些副作用，例如，写某个文件或向给定的指针拷贝数据等。系统调用还会通过一个long类型的返回值来表示成功或者错误。通常，但也不绝对，用一个负的返回值来表明错误。返回一个0值通常（当然仍不是绝对的）表明成功。系统调用在出现错误的时候C库会把错误码写人errno全局变量。通过调用perror()库函数，可以把该变量翻译成用户可以理解的错误字符串。
在 Linux 中，每个系统调用被赋予一个系统调用号。这样，通过这个独一无二的号就可以关联系统调用。当用户空间的进程执行一个系统调用的时候，这个系统调用号就用来指明到底是要执行哪个系统调用;进程不会提及系统调用的名称。
系统调用说明

asmlinkage 限定词，这是一个编译指令，通知编译器仅从栈中提取该函数的参数。
函数返回 long，为了保证 32 位和 64 位系统的兼容，系统调用在用户空间和内核空间有不同的返回值类型，在用户空间为 int，在内核空间为 long。
假设系统调用在内核空间定义为 sys_ioctl，那么该系统调用的用户空间接口为 ioctl
Linux kernel-5.18.8 有 440 个系统调用，这些系统调用讲究通用性，一旦固定，很少修改，保证 Linux 系统的稳定性和兼容性。
/include/linux/syscalls.h
#ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
asmlinkage long sys_io_setup(unsigned nr_reqs, aio_context_t __user *ctx);
asmlinkage long sys_io_destroy(aio_context_t ctx);
asmlinkage long sys_io_submit(aio_context_t, long,
   struct iocb __user * __user *);
asmlinkage long sys_io_cancel(aio_context_t ctx_id, struct iocb __user *iocb,
         struct io_event __user *result);
asmlinkage long sys_io_getevents(aio_context_t ctx_id,
    long min_nr,
    long nr,
    struct io_event __user *events,
    struct __kernel_timespec __user *timeout);
asmlinkage long sys_io_getevents_time32(__u32 ctx_id,
    __s32 min_nr,
    __s32 nr,
    struct io_event __user *events,
    struct old_timespec32 __user *timeout);
asmlinkage long sys_io_pgetevents(aio_context_t ctx_id,
    long min_nr,
    long nr,
    struct io_event __user *events,
    struct __kernel_timespec __user *timeout,
    const struct __aio_sigset *sig);
asmlinkage long sys_io_pgetevents_time32(aio_context_t ctx_id,
    long min_nr,
    long nr,
    struct io_event __user *events,
    struct old_timespec32 __user *timeout,
    const struct __aio_sigset *sig);
asmlinkage long sys_io_uring_setup(u32 entries,
    struct io_uring_params __user *p);
asmlinkage long sys_io_uring_enter(unsigned int fd, u32 to_submit,
    u32 min_complete, u32 flags,
    const void __user *argp, size_t argsz);
asmlinkage long sys_io_uring_register(unsigned int fd, unsigned int op,
    void __user *arg, unsigned int nr_args);

/* fs/xattr.c */
asmlinkage long sys_setxattr(const char __user *path, const char __user *name,
        const void __user *value, size_t size, int flags);
asmlinkage long sys_lsetxattr(const char __user *path, const char __user *name,
         const void __user *value, size_t size, int flags);
asmlinkage long sys_fsetxattr(int fd, const char __user *name,
         const void __user *value, size_t size, int flags);
asmlinkage long sys_getxattr(const char __user *path, const char __user *name,
        void __user *value, size_t size);
asmlinkage long sys_lgetxattr(const char __user *path, const char __user *name,
         void __user *value, size_t size);
asmlinkage long sys_fgetxattr(int fd, const char __user *name,
         void __user *value, size_t size);
asmlinkage long sys_listxattr(const char __user *path, char __user *list,
         size_t size);
asmlinkage long sys_llistxattr(const char __user *path, char __user *list,
          size_t size);
asmlinkage long sys_flistxattr(int fd, char __user *list, size_t size);
asmlinkage long sys_removexattr(const char __user *path,
    const char __user *name);
asmlinkage long sys_lremovexattr(const char __user *path,
     const char __user *name);
asmlinkage long sys_fremovexattr(int fd, const char __user *name);

/* fs/dcache.c */
asmlinkage long sys_getcwd(char __user *buf, unsigned long size);

/* fs/cookies.c */
asmlinkage long sys_lookup_dcookie(u64 cookie64, char __user *buf, size_t len);

/* fs/eventfd.c */
asmlinkage long sys_eventfd2(unsigned int count, int flags);

/* fs/eventpoll.c */
asmlinkage long sys_epoll_create1(int flags);
asmlinkage long sys_epoll_ctl(int epfd, int op, int fd,
    struct epoll_event __user *event);
asmlinkage long sys_epoll_pwait(int epfd, struct epoll_event __user *events,
    int maxevents, int timeout,
    const sigset_t __user *sigmask,
    size_t sigsetsize);
asmlinkage long sys_epoll_pwait2(int epfd, struct epoll_event __user *events,
     int maxevents,
     const struct __kernel_timespec __user *timeout,
     const sigset_t __user *sigmask,
     size_t sigsetsize);

/* fs/fcntl.c */
asmlinkage long sys_dup(unsigned int fildes);
asmlinkage long sys_dup3(unsigned int oldfd, unsigned int newfd, int flags);
asmlinkage long sys_fcntl(unsigned int fd, unsigned int cmd, unsigned long arg);
#if BITS_PER_LONG == 32
asmlinkage long sys_fcntl64(unsigned int fd,
    unsigned int cmd, unsigned long arg);
#endif

/* fs/inotify_user.c */
asmlinkage long sys_inotify_init1(int flags);
asmlinkage long sys_inotify_add_watch(int fd, const char __user *path,
     u32 mask);
asmlinkage long sys_inotify_rm_watch(int fd, __s32 wd);

/* fs/ioctl.c */
asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd,
    unsigned long arg);

/* fs/ioprio.c */
asmlinkage long sys_ioprio_set(int which, int who, int ioprio);
asmlinkage long sys_ioprio_get(int which, int who);

/* fs/locks.c */
asmlinkage long sys_flock(unsigned int fd, unsigned int cmd);

/* fs/namei.c */
asmlinkage long sys_mknodat(int dfd, const char __user * filename, umode_t mode,
       unsigned dev);
asmlinkage long sys_mkdirat(int dfd, const char __user * pathname, umode_t mode);
asmlinkage long sys_unlinkat(int dfd, const char __user * pathname, int flag);
asmlinkage long sys_symlinkat(const char __user * oldname,
         int newdfd, const char __user * newname);
asmlinkage long sys_linkat(int olddfd, const char __user *oldname,
      int newdfd, const char __user *newname, int flags);
asmlinkage long sys_renameat(int olddfd, const char __user * oldname,
        int newdfd, const char __user * newname);

/* fs/namespace.c */
asmlinkage long sys_umount(char __user *name, int flags);
asmlinkage long sys_mount(char __user *dev_name, char __user *dir_name,
    char __user *type, unsigned long flags,
    void __user *data);
asmlinkage long sys_pivot_root(const char __user *new_root,
    const char __user *put_old);

/* fs/nfsctl.c */

/* fs/open.c */
asmlinkage long sys_statfs(const char __user * path,
    struct statfs __user *buf);
asmlinkage long sys_statfs64(const char __user *path, size_t sz,
    struct statfs64 __user *buf);
asmlinkage long sys_fstatfs(unsigned int fd, struct statfs __user *buf);
asmlinkage long sys_fstatfs64(unsigned int fd, size_t sz,
    struct statfs64 __user *buf);
asmlinkage long sys_truncate(const char __user *path, long length);
asmlinkage long sys_ftruncate(unsigned int fd, unsigned long length);
#if BITS_PER_LONG == 32
asmlinkage long sys_truncate64(const char __user *path, loff_t length);
asmlinkage long sys_ftruncate64(unsigned int fd, loff_t length);
#endif
asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len);
asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode);
asmlinkage long sys_faccessat2(int dfd, const char __user *filename, int mode,
          int flags);
asmlinkage long sys_chdir(const char __user *filename);
asmlinkage long sys_fchdir(unsigned int fd);
asmlinkage long sys_chroot(const char __user *filename);
asmlinkage long sys_fchmod(unsigned int fd, umode_t mode);
asmlinkage long sys_fchmodat(int dfd, const char __user * filename,
        umode_t mode);
asmlinkage long sys_fchownat(int dfd, const char __user *filename, uid_t user,
        gid_t group, int flag);
asmlinkage long sys_fchown(unsigned int fd, uid_t user, gid_t group);
asmlinkage long sys_openat(int dfd, const char __user *filename, int flags,
      umode_t mode);
asmlinkage long sys_openat2(int dfd, const char __user *filename,
       struct open_how *how, size_t size);
asmlinkage long sys_close(unsigned int fd);
asmlinkage long sys_close_range(unsigned int fd, unsigned int max_fd,
    unsigned int flags);
asmlinkage long sys_vhangup(void);

/* fs/pipe.c */
asmlinkage long sys_pipe2(int __user *fildes, int flags);

/* fs/quota.c */
asmlinkage long sys_quotactl(unsigned int cmd, const char __user *special,
    qid_t id, void __user *addr);
asmlinkage long sys_quotactl_fd(unsigned int fd, unsigned int cmd, qid_t id,
    void __user *addr);

/* fs/readdir.c */
asmlinkage long sys_getdents64(unsigned int fd,
    struct linux_dirent64 __user *dirent,
    unsigned int count);

/* fs/read_write.c */
asmlinkage long sys_llseek(unsigned int fd, unsigned long offset_high,
   unsigned long offset_low, loff_t __user *result,
   unsigned int whence);
asmlinkage long sys_lseek(unsigned int fd, off_t offset,
     unsigned int whence);
asmlinkage long sys_read(unsigned int fd, char __user *buf, size_t count);
asmlinkage long sys_write(unsigned int fd, const char __user *buf,
     size_t count);
asmlinkage long sys_readv(unsigned long fd,
     const struct iovec __user *vec,
     unsigned long vlen);
asmlinkage long sys_writev(unsigned long fd,
      const struct iovec __user *vec,
      unsigned long vlen);
asmlinkage long sys_pread64(unsigned int fd, char __user *buf,
       size_t count, loff_t pos);
asmlinkage long sys_pwrite64(unsigned int fd, const char __user *buf,
        size_t count, loff_t pos);
asmlinkage long sys_preadv(unsigned long fd, const struct iovec __user *vec,
      unsigned long vlen, unsigned long pos_l, unsigned long pos_h);
asmlinkage long sys_pwritev(unsigned long fd, const struct iovec __user *vec,
       unsigned long vlen, unsigned long pos_l, unsigned long pos_h);

/* fs/sendfile.c */
asmlinkage long sys_sendfile64(int out_fd, int in_fd,
          loff_t __user *offset, size_t count);

/* fs/select.c */
asmlinkage long sys_pselect6(int, fd_set __user *, fd_set __user *,
        fd_set __user *, struct __kernel_timespec __user *,
        void __user *);
asmlinkage long sys_pselect6_time32(int, fd_set __user *, fd_set __user *,
        fd_set __user *, struct old_timespec32 __user *,
        void __user *);
asmlinkage long sys_ppoll(struct pollfd __user *, unsigned int,
     struct __kernel_timespec __user *, const sigset_t __user *,
     size_t);
asmlinkage long sys_ppoll_time32(struct pollfd __user *, unsigned int,
     struct old_timespec32 __user *, const sigset_t __user *,
     size_t);

/* fs/signalfd.c */
asmlinkage long sys_signalfd4(int ufd, sigset_t __user *user_mask, size_t sizemask, int flags);

/* fs/splice.c */
asmlinkage long sys_vmsplice(int fd, const struct iovec __user *iov,
        unsigned long nr_segs, unsigned int flags);
asmlinkage long sys_splice(int fd_in, loff_t __user *off_in,
      int fd_out, loff_t __user *off_out,
      size_t len, unsigned int flags);
asmlinkage long sys_tee(int fdin, int fdout, size_t len, unsigned int flags);

/* fs/stat.c */
asmlinkage long sys_readlinkat(int dfd, const char __user *path, char __user *buf,
          int bufsiz);
asmlinkage long sys_newfstatat(int dfd, const char __user *filename,
          struct stat __user *statbuf, int flag);
asmlinkage long sys_newfstat(unsigned int fd, struct stat __user *statbuf);
#if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user *statbuf);
asmlinkage long sys_fstatat64(int dfd, const char __user *filename,
          struct stat64 __user *statbuf, int flag);
#endif

/* fs/sync.c */
asmlinkage long sys_sync(void);
asmlinkage long sys_fsync(unsigned int fd);
asmlinkage long sys_fdatasync(unsigned int fd);
asmlinkage long sys_sync_file_range2(int fd, unsigned int flags,
         loff_t offset, loff_t nbytes);
asmlinkage long sys_sync_file_range(int fd, loff_t offset, loff_t nbytes,
     unsigned int flags);

/* fs/timerfd.c */
asmlinkage long sys_timerfd_create(int clockid, int flags);
asmlinkage long sys_timerfd_settime(int ufd, int flags,
        const struct __kernel_itimerspec __user *utmr,
        struct __kernel_itimerspec __user *otmr);
asmlinkage long sys_timerfd_gettime(int ufd, struct __kernel_itimerspec __user *otmr);
asmlinkage long sys_timerfd_gettime32(int ufd,
       struct old_itimerspec32 __user *otmr);
asmlinkage long sys_timerfd_settime32(int ufd, int flags,
       const struct old_itimerspec32 __user *utmr,
       struct old_itimerspec32 __user *otmr);

/* fs/utimes.c */
asmlinkage long sys_utimensat(int dfd, const char __user *filename,
    struct __kernel_timespec __user *utimes,
    int flags);
asmlinkage long sys_utimensat_time32(unsigned int dfd,
    const char __user *filename,
    struct old_timespec32 __user *t, int flags);

/* kernel/acct.c */
asmlinkage long sys_acct(const char __user *name);

/* kernel/capability.c */
asmlinkage long sys_capget(cap_user_header_t header,
    cap_user_data_t dataptr);
asmlinkage long sys_capset(cap_user_header_t header,
    const cap_user_data_t data);

/* kernel/exec_domain.c */
asmlinkage long sys_personality(unsigned int personality);

/* kernel/exit.c */
asmlinkage long sys_exit(int error_code);
asmlinkage long sys_exit_group(int error_code);
asmlinkage long sys_waitid(int which, pid_t pid,
      struct siginfo __user *infop,
      int options, struct rusage __user *ru);

/* kernel/fork.c */
asmlinkage long sys_set_tid_address(int __user *tidptr);
asmlinkage long sys_unshare(unsigned long unshare_flags);

/* kernel/futex/syscalls.c */
asmlinkage long sys_futex(u32 __user *uaddr, int op, u32 val,
     const struct __kernel_timespec __user *utime,
     u32 __user *uaddr2, u32 val3);
asmlinkage long sys_futex_time32(u32 __user *uaddr, int op, u32 val,
     const struct old_timespec32 __user *utime,
     u32 __user *uaddr2, u32 val3);
asmlinkage long sys_get_robust_list(int pid,
        struct robust_list_head __user * __user *head_ptr,
        size_t __user *len_ptr);
asmlinkage long sys_set_robust_list(struct robust_list_head __user *head,
        size_t len);

asmlinkage long sys_futex_waitv(struct futex_waitv *waiters,
    unsigned int nr_futexes, unsigned int flags,
    struct __kernel_timespec __user *timeout, clockid_t clockid);

/* kernel/hrtimer.c */
asmlinkage long sys_nanosleep(struct __kernel_timespec __user *rqtp,
         struct __kernel_timespec __user *rmtp);
asmlinkage long sys_nanosleep_time32(struct old_timespec32 __user *rqtp,
         struct old_timespec32 __user *rmtp);

/* kernel/itimer.c */
asmlinkage long sys_getitimer(int which, struct __kernel_old_itimerval __user *value);
asmlinkage long sys_setitimer(int which,
    struct __kernel_old_itimerval __user *value,
    struct __kernel_old_itimerval __user *ovalue);

/* kernel/kexec.c */
asmlinkage long sys_kexec_load(unsigned long entry, unsigned long nr_segments,
    struct kexec_segment __user *segments,
    unsigned long flags);

/* kernel/module.c */
asmlinkage long sys_init_module(void __user *umod, unsigned long len,
    const char __user *uargs);
asmlinkage long sys_delete_module(const char __user *name_user,
    unsigned int flags);

/* kernel/posix-timers.c */
asmlinkage long sys_timer_create(clockid_t which_clock,
     struct sigevent __user *timer_event_spec,
     timer_t __user * created_timer_id);
asmlinkage long sys_timer_gettime(timer_t timer_id,
    struct __kernel_itimerspec __user *setting);
asmlinkage long sys_timer_getoverrun(timer_t timer_id);
asmlinkage long sys_timer_settime(timer_t timer_id, int flags,
    const struct __kernel_itimerspec __user *new_setting,
    struct __kernel_itimerspec __user *old_setting);
asmlinkage long sys_timer_delete(timer_t timer_id);
asmlinkage long sys_clock_settime(clockid_t which_clock,
    const struct __kernel_timespec __user *tp);
asmlinkage long sys_clock_gettime(clockid_t which_clock,
    struct __kernel_timespec __user *tp);
asmlinkage long sys_clock_getres(clockid_t which_clock,
    struct __kernel_timespec __user *tp);
asmlinkage long sys_clock_nanosleep(clockid_t which_clock, int flags,
    const struct __kernel_timespec __user *rqtp,
    struct __kernel_timespec __user *rmtp);
asmlinkage long sys_timer_gettime32(timer_t timer_id,
     struct old_itimerspec32 __user *setting);
asmlinkage long sys_timer_settime32(timer_t timer_id, int flags,
      struct old_itimerspec32 __user *new,
      struct old_itimerspec32 __user *old);
asmlinkage long sys_clock_settime32(clockid_t which_clock,
    struct old_timespec32 __user *tp);
asmlinkage long sys_clock_gettime32(clockid_t which_clock,
    struct old_timespec32 __user *tp);
asmlinkage long sys_clock_getres_time32(clockid_t which_clock,
    struct old_timespec32 __user *tp);
asmlinkage long sys_clock_nanosleep_time32(clockid_t which_clock, int flags,
    struct old_timespec32 __user *rqtp,
    struct old_timespec32 __user *rmtp);

/* kernel/printk.c */
asmlinkage long sys_syslog(int type, char __user *buf, int len);

/* kernel/ptrace.c */
asmlinkage long sys_ptrace(long request, long pid, unsigned long addr,
      unsigned long data);
/* kernel/sched/core.c */

asmlinkage long sys_sched_setparam(pid_t pid,
     struct sched_param __user *param);
asmlinkage long sys_sched_setscheduler(pid_t pid, int policy,
     struct sched_param __user *param);
asmlinkage long sys_sched_getscheduler(pid_t pid);
asmlinkage long sys_sched_getparam(pid_t pid,
     struct sched_param __user *param);
asmlinkage long sys_sched_setaffinity(pid_t pid, unsigned int len,
     unsigned long __user *user_mask_ptr);
asmlinkage long sys_sched_getaffinity(pid_t pid, unsigned int len,
     unsigned long __user *user_mask_ptr);
asmlinkage long sys_sched_yield(void);
asmlinkage long sys_sched_get_priority_max(int policy);
asmlinkage long sys_sched_get_priority_min(int policy);
asmlinkage long sys_sched_rr_get_interval(pid_t pid,
    struct __kernel_timespec __user *interval);
asmlinkage long sys_sched_rr_get_interval_time32(pid_t pid,
       struct old_timespec32 __user *interval);

/* kernel/signal.c */
asmlinkage long sys_restart_syscall(void);
asmlinkage long sys_kill(pid_t pid, int sig);
asmlinkage long sys_tkill(pid_t pid, int sig);
asmlinkage long sys_tgkill(pid_t tgid, pid_t pid, int sig);
asmlinkage long sys_sigaltstack(const struct sigaltstack __user *uss,
    struct sigaltstack __user *uoss);
asmlinkage long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize);
#ifndef CONFIG_ODD_RT_SIGACTION
asmlinkage long sys_rt_sigaction(int,
     const struct sigaction __user *,
     struct sigaction __user *,
     size_t);
#endif
asmlinkage long sys_rt_sigprocmask(int how, sigset_t __user *set,
    sigset_t __user *oset, size_t sigsetsize);
asmlinkage long sys_rt_sigpending(sigset_t __user *set, size_t sigsetsize);
asmlinkage long sys_rt_sigtimedwait(const sigset_t __user *uthese,
    siginfo_t __user *uinfo,
    const struct __kernel_timespec __user *uts,
    size_t sigsetsize);
asmlinkage long sys_rt_sigtimedwait_time32(const sigset_t __user *uthese,
    siginfo_t __user *uinfo,
    const struct old_timespec32 __user *uts,
    size_t sigsetsize);
asmlinkage long sys_rt_sigqueueinfo(pid_t pid, int sig, siginfo_t __user *uinfo);

/* kernel/sys.c */
asmlinkage long sys_setpriority(int which, int who, int niceval);
asmlinkage long sys_getpriority(int which, int who);
asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd,
    void __user *arg);
asmlinkage long sys_setregid(gid_t rgid, gid_t egid);
asmlinkage long sys_setgid(gid_t gid);
asmlinkage long sys_setreuid(uid_t ruid, uid_t euid);
asmlinkage long sys_setuid(uid_t uid);
asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid);
asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __user *suid);
asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid);
asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __user *sgid);
asmlinkage long sys_setfsuid(uid_t uid);
asmlinkage long sys_setfsgid(gid_t gid);
asmlinkage long sys_times(struct tms __user *tbuf);
asmlinkage long sys_setpgid(pid_t pid, pid_t pgid);
asmlinkage long sys_getpgid(pid_t pid);
asmlinkage long sys_getsid(pid_t pid);
asmlinkage long sys_setsid(void);
asmlinkage long sys_getgroups(int gidsetsize, gid_t __user *grouplist);
asmlinkage long sys_setgroups(int gidsetsize, gid_t __user *grouplist);
asmlinkage long sys_newuname(struct new_utsname __user *name);
asmlinkage long sys_sethostname(char __user *name, int len);
asmlinkage long sys_setdomainname(char __user *name, int len);
asmlinkage long sys_getrlimit(unsigned int resource,
    struct rlimit __user *rlim);
asmlinkage long sys_setrlimit(unsigned int resource,
    struct rlimit __user *rlim);
asmlinkage long sys_getrusage(int who, struct rusage __user *ru);
asmlinkage long sys_umask(int mask);
asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
   unsigned long arg4, unsigned long arg5);
asmlinkage long sys_getcpu(unsigned __user *cpu, unsigned __user *node, struct getcpu_cache __user *cache);

/* kernel/time.c */
asmlinkage long sys_gettimeofday(struct __kernel_old_timeval __user *tv,
    struct timezone __user *tz);
asmlinkage long sys_settimeofday(struct __kernel_old_timeval __user *tv,
    struct timezone __user *tz);
asmlinkage long sys_adjtimex(struct __kernel_timex __user *txc_p);
asmlinkage long sys_adjtimex_time32(struct old_timex32 __user *txc_p);

/* kernel/sys.c */
asmlinkage long sys_getpid(void);
asmlinkage long sys_getppid(void);
asmlinkage long sys_getuid(void);
asmlinkage long sys_geteuid(void);
asmlinkage long sys_getgid(void);
asmlinkage long sys_getegid(void);
asmlinkage long sys_gettid(void);
asmlinkage long sys_sysinfo(struct sysinfo __user *info);

/* ipc/mqueue.c */
asmlinkage long sys_mq_open(const char __user *name, int oflag, umode_t mode, struct mq_attr __user *attr);
asmlinkage long sys_mq_unlink(const char __user *name);
asmlinkage long sys_mq_timedsend(mqd_t mqdes, const char __user *msg_ptr, size_t msg_len, unsigned int msg_prio, const struct __kernel_timespec __user *abs_timeout);
asmlinkage long sys_mq_timedreceive(mqd_t mqdes, char __user *msg_ptr, size_t msg_len, unsigned int __user *msg_prio, const struct __kernel_timespec __user *abs_timeout);
asmlinkage long sys_mq_notify(mqd_t mqdes, const struct sigevent __user *notification);
asmlinkage long sys_mq_getsetattr(mqd_t mqdes, const struct mq_attr __user *mqstat, struct mq_attr __user *omqstat);
asmlinkage long sys_mq_timedreceive_time32(mqd_t mqdes,
   char __user *u_msg_ptr,
   unsigned int msg_len, unsigned int __user *u_msg_prio,
   const struct old_timespec32 __user *u_abs_timeout);
asmlinkage long sys_mq_timedsend_time32(mqd_t mqdes,
   const char __user *u_msg_ptr,
   unsigned int msg_len, unsigned int msg_prio,
   const struct old_timespec32 __user *u_abs_timeout);

/* ipc/msg.c */
asmlinkage long sys_msgget(key_t key, int msgflg);
asmlinkage long sys_old_msgctl(int msqid, int cmd, struct msqid_ds __user *buf);
asmlinkage long sys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf);
asmlinkage long sys_msgrcv(int msqid, struct msgbuf __user *msgp,
    size_t msgsz, long msgtyp, int msgflg);
asmlinkage long sys_msgsnd(int msqid, struct msgbuf __user *msgp,
    size_t msgsz, int msgflg);

/* ipc/sem.c */
asmlinkage long sys_semget(key_t key, int nsems, int semflg);
asmlinkage long sys_semctl(int semid, int semnum, int cmd, unsigned long arg);
asmlinkage long sys_old_semctl(int semid, int semnum, int cmd, unsigned long arg);
asmlinkage long sys_semtimedop(int semid, struct sembuf __user *sops,
    unsigned nsops,
    const struct __kernel_timespec __user *timeout);
asmlinkage long sys_semtimedop_time32(int semid, struct sembuf __user *sops,
    unsigned nsops,
    const struct old_timespec32 __user *timeout);
asmlinkage long sys_semop(int semid, struct sembuf __user *sops,
    unsigned nsops);

/* ipc/shm.c */
asmlinkage long sys_shmget(key_t key, size_t size, int flag);
asmlinkage long sys_old_shmctl(int shmid, int cmd, struct shmid_ds __user *buf);
asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf);
asmlinkage long sys_shmat(int shmid, char __user *shmaddr, int shmflg);
asmlinkage long sys_shmdt(char __user *shmaddr);

/* net/socket.c */
asmlinkage long sys_socket(int, int, int);
asmlinkage long sys_socketpair(int, int, int, int __user *);
asmlinkage long sys_bind(int, struct sockaddr __user *, int);
asmlinkage long sys_listen(int, int);
asmlinkage long sys_accept(int, struct sockaddr __user *, int __user *);
asmlinkage long sys_connect(int, struct sockaddr __user *, int);
asmlinkage long sys_getsockname(int, struct sockaddr __user *, int __user *);
asmlinkage long sys_getpeername(int, struct sockaddr __user *, int __user *);
asmlinkage long sys_sendto(int, void __user *, size_t, unsigned,
    struct sockaddr __user *, int);
asmlinkage long sys_recvfrom(int, void __user *, size_t, unsigned,
    struct sockaddr __user *, int __user *);
asmlinkage long sys_setsockopt(int fd, int level, int optname,
    char __user *optval, int optlen);
asmlinkage long sys_getsockopt(int fd, int level, int optname,
    char __user *optval, int __user *optlen);
asmlinkage long sys_shutdown(int, int);
asmlinkage long sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags);
asmlinkage long sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags);

/* mm/filemap.c */
asmlinkage long sys_readahead(int fd, loff_t offset, size_t count);

/* mm/nommu.c, also with MMU */
asmlinkage long sys_brk(unsigned long brk);
asmlinkage long sys_munmap(unsigned long addr, size_t len);
asmlinkage long sys_mremap(unsigned long addr,
      unsigned long old_len, unsigned long new_len,
      unsigned long flags, unsigned long new_addr);

/* security/keys/keyctl.c */
asmlinkage long sys_add_key(const char __user *_type,
       const char __user *_description,
       const void __user *_payload,
       size_t plen,
       key_serial_t destringid);
asmlinkage long sys_request_key(const char __user *_type,
    const char __user *_description,
    const char __user *_callout_info,
    key_serial_t destringid);
asmlinkage long sys_keyctl(int cmd, unsigned long arg2, unsigned long arg3,
      unsigned long arg4, unsigned long arg5);

/* arch/example/kernel/sys_example.c */
#ifdef CONFIG_CLONE_BACKWARDS
asmlinkage long sys_clone(unsigned long, unsigned long, int __user *, unsigned long,
        int __user *);
#else
#ifdef CONFIG_CLONE_BACKWARDS3
asmlinkage long sys_clone(unsigned long, unsigned long, int, int __user *,
     int __user *, unsigned long);
#else
asmlinkage long sys_clone(unsigned long, unsigned long, int __user *,
        int __user *, unsigned long);
#endif
#endif

asmlinkage long sys_clone3(struct clone_args __user *uargs, size_t size);

asmlinkage long sys_execve(const char __user *filename,
  const char __user *const __user *argv,
  const char __user *const __user *envp);

/* mm/fadvise.c */
asmlinkage long sys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice);

/* mm/, CONFIG_MMU only */
asmlinkage long sys_swapon(const char __user *specialfile, int swap_flags);
asmlinkage long sys_swapoff(const char __user *specialfile);
asmlinkage long sys_mprotect(unsigned long start, size_t len,
    unsigned long prot);
asmlinkage long sys_msync(unsigned long start, size_t len, int flags);
asmlinkage long sys_mlock(unsigned long start, size_t len);
asmlinkage long sys_munlock(unsigned long start, size_t len);
asmlinkage long sys_mlockall(int flags);
asmlinkage long sys_munlockall(void);
asmlinkage long sys_mincore(unsigned long start, size_t len,
    unsigned char __user * vec);
asmlinkage long sys_madvise(unsigned long start, size_t len, int behavior);
asmlinkage long sys_process_madvise(int pidfd, const struct iovec __user *vec,
   size_t vlen, int behavior, unsigned int flags);
asmlinkage long sys_process_mrelease(int pidfd, unsigned int flags);
asmlinkage long sys_remap_file_pages(unsigned long start, unsigned long size,
   unsigned long prot, unsigned long pgoff,
   unsigned long flags);
asmlinkage long sys_mbind(unsigned long start, unsigned long len,
    unsigned long mode,
    const unsigned long __user *nmask,
    unsigned long maxnode,
    unsigned flags);
asmlinkage long sys_get_mempolicy(int __user *policy,
    unsigned long __user *nmask,
    unsigned long maxnode,
    unsigned long addr, unsigned long flags);
asmlinkage long sys_set_mempolicy(int mode, const unsigned long __user *nmask,
    unsigned long maxnode);
asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode,
    const unsigned long __user *from,
    const unsigned long __user *to);
asmlinkage long sys_move_pages(pid_t pid, unsigned long nr_pages,
    const void __user * __user *pages,
    const int __user *nodes,
    int __user *status,
    int flags);

asmlinkage long sys_rt_tgsigqueueinfo(pid_t tgid, pid_t  pid, int sig,
  siginfo_t __user *uinfo);
asmlinkage long sys_perf_event_open(
  struct perf_event_attr __user *attr_uptr,
  pid_t pid, int cpu, int group_fd, unsigned long flags);
asmlinkage long sys_accept4(int, struct sockaddr __user *, int __user *, int);
asmlinkage long sys_recvmmsg(int fd, struct mmsghdr __user *msg,
        unsigned int vlen, unsigned flags,
        struct __kernel_timespec __user *timeout);
asmlinkage long sys_recvmmsg_time32(int fd, struct mmsghdr __user *msg,
        unsigned int vlen, unsigned flags,
        struct old_timespec32 __user *timeout);

asmlinkage long sys_wait4(pid_t pid, int __user *stat_addr,
    int options, struct rusage __user *ru);
asmlinkage long sys_prlimit64(pid_t pid, unsigned int resource,
    const struct rlimit64 __user *new_rlim,
    struct rlimit64 __user *old_rlim);
asmlinkage long sys_fanotify_init(unsigned int flags, unsigned int event_f_flags);
asmlinkage long sys_fanotify_mark(int fanotify_fd, unsigned int flags,
      u64 mask, int fd,
      const char  __user *pathname);
asmlinkage long sys_name_to_handle_at(int dfd, const char __user *name,
          struct file_handle __user *handle,
          int __user *mnt_id, int flag);
asmlinkage long sys_open_by_handle_at(int mountdirfd,
          struct file_handle __user *handle,
          int flags);
asmlinkage long sys_clock_adjtime(clockid_t which_clock,
    struct __kernel_timex __user *tx);
asmlinkage long sys_clock_adjtime32(clockid_t which_clock,
    struct old_timex32 __user *tx);
asmlinkage long sys_syncfs(int fd);
asmlinkage long sys_setns(int fd, int nstype);
asmlinkage long sys_pidfd_open(pid_t pid, unsigned int flags);
asmlinkage long sys_sendmmsg(int fd, struct mmsghdr __user *msg,
        unsigned int vlen, unsigned flags);
asmlinkage long sys_process_vm_readv(pid_t pid,
         const struct iovec __user *lvec,
         unsigned long liovcnt,
         const struct iovec __user *rvec,
         unsigned long riovcnt,
         unsigned long flags);
asmlinkage long sys_process_vm_writev(pid_t pid,
          const struct iovec __user *lvec,
          unsigned long liovcnt,
          const struct iovec __user *rvec,
          unsigned long riovcnt,
          unsigned long flags);
asmlinkage long sys_kcmp(pid_t pid1, pid_t pid2, int type,
    unsigned long idx1, unsigned long idx2);
asmlinkage long sys_finit_module(int fd, const char __user *uargs, int flags);
asmlinkage long sys_sched_setattr(pid_t pid,
     struct sched_attr __user *attr,
     unsigned int flags);
asmlinkage long sys_sched_getattr(pid_t pid,
     struct sched_attr __user *attr,
     unsigned int size,
     unsigned int flags);
asmlinkage long sys_renameat2(int olddfd, const char __user *oldname,
         int newdfd, const char __user *newname,
         unsigned int flags);
asmlinkage long sys_seccomp(unsigned int op, unsigned int flags,
       void __user *uargs);
asmlinkage long sys_getrandom(char __user *buf, size_t count,
         unsigned int flags);
asmlinkage long sys_memfd_create(const char __user *uname_ptr, unsigned int flags);
asmlinkage long sys_bpf(int cmd, union bpf_attr *attr, unsigned int size);
asmlinkage long sys_execveat(int dfd, const char __user *filename,
   const char __user *const __user *argv,
   const char __user *const __user *envp, int flags);
asmlinkage long sys_userfaultfd(int flags);
asmlinkage long sys_membarrier(int cmd, unsigned int flags, int cpu_id);
asmlinkage long sys_mlock2(unsigned long start, size_t len, int flags);
asmlinkage long sys_copy_file_range(int fd_in, loff_t __user *off_in,
        int fd_out, loff_t __user *off_out,
        size_t len, unsigned int flags);
asmlinkage long sys_preadv2(unsigned long fd, const struct iovec __user *vec,
       unsigned long vlen, unsigned long pos_l, unsigned long pos_h,
       rwf_t flags);
asmlinkage long sys_pwritev2(unsigned long fd, const struct iovec __user *vec,
       unsigned long vlen, unsigned long pos_l, unsigned long pos_h,
       rwf_t flags);
asmlinkage long sys_pkey_mprotect(unsigned long start, size_t len,
      unsigned long prot, int pkey);
asmlinkage long sys_pkey_alloc(unsigned long flags, unsigned long init_val);
asmlinkage long sys_pkey_free(int pkey);
asmlinkage long sys_statx(int dfd, const char __user *path, unsigned flags,
     unsigned mask, struct statx __user *buffer);
asmlinkage long sys_rseq(struct rseq __user *rseq, uint32_t rseq_len,
    int flags, uint32_t sig);
asmlinkage long sys_open_tree(int dfd, const char __user *path, unsigned flags);
asmlinkage long sys_move_mount(int from_dfd, const char __user *from_path,
          int to_dfd, const char __user *to_path,
          unsigned int ms_flags);
asmlinkage long sys_mount_setattr(int dfd, const char __user *path,
      unsigned int flags,
      struct mount_attr __user *uattr, size_t usize);
asmlinkage long sys_fsopen(const char __user *fs_name, unsigned int flags);
asmlinkage long sys_fsconfig(int fs_fd, unsigned int cmd, const char __user *key,
        const void __user *value, int aux);
asmlinkage long sys_fsmount(int fs_fd, unsigned int flags, unsigned int ms_flags);
asmlinkage long sys_fspick(int dfd, const char __user *path, unsigned int flags);
asmlinkage long sys_pidfd_send_signal(int pidfd, int sig,
           siginfo_t __user *info,
           unsigned int flags);
asmlinkage long sys_pidfd_getfd(int pidfd, int fd, unsigned int flags);
asmlinkage long sys_landlock_create_ruleset(const struct landlock_ruleset_attr __user *attr,
  size_t size, __u32 flags);
asmlinkage long sys_landlock_add_rule(int ruleset_fd, enum landlock_rule_type rule_type,
  const void __user *rule_attr, __u32 flags);
asmlinkage long sys_landlock_restrict_self(int ruleset_fd, __u32 flags);
asmlinkage long sys_memfd_secret(unsigned int flags);
asmlinkage long sys_set_mempolicy_home_node(unsigned long start, unsigned long len,
         unsigned long home_node,
         unsigned long flags);
/*
 * Architecture-specific system calls
 */

/* arch/x86/kernel/ioport.c */
asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int on);

/* pciconfig: alpha, arm, arm64, ia64, sparc */
asmlinkage long sys_pciconfig_read(unsigned long bus, unsigned long dfn,
    unsigned long off, unsigned long len,
    void __user *buf);
asmlinkage long sys_pciconfig_write(unsigned long bus, unsigned long dfn,
    unsigned long off, unsigned long len,
    void __user *buf);
asmlinkage long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn);

/* powerpc */
asmlinkage long sys_spu_run(int fd, __u32 __user *unpc,
     __u32 __user *ustatus);
asmlinkage long sys_spu_create(const char __user *name,
  unsigned int flags, umode_t mode, int fd);

/*
 * Deprecated system calls which are still defined in
 * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
 */

/* __ARCH_WANT_SYSCALL_NO_AT */
asmlinkage long sys_open(const char __user *filename,
    int flags, umode_t mode);
asmlinkage long sys_link(const char __user *oldname,
    const char __user *newname);
asmlinkage long sys_unlink(const char __user *pathname);
asmlinkage long sys_mknod(const char __user *filename, umode_t mode,
    unsigned dev);
asmlinkage long sys_chmod(const char __user *filename, umode_t mode);
asmlinkage long sys_chown(const char __user *filename,
    uid_t user, gid_t group);
asmlinkage long sys_mkdir(const char __user *pathname, umode_t mode);
asmlinkage long sys_rmdir(const char __user *pathname);
asmlinkage long sys_lchown(const char __user *filename,
    uid_t user, gid_t group);
asmlinkage long sys_access(const char __user *filename, int mode);
asmlinkage long sys_rename(const char __user *oldname,
    const char __user *newname);
asmlinkage long sys_symlink(const char __user *old, const char __user *new);
#if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
asmlinkage long sys_stat64(const char __user *filename,
    struct stat64 __user *statbuf);
asmlinkage long sys_lstat64(const char __user *filename,
    struct stat64 __user *statbuf);
#endif

/* __ARCH_WANT_SYSCALL_NO_FLAGS */
asmlinkage long sys_pipe(int __user *fildes);
asmlinkage long sys_dup2(unsigned int oldfd, unsigned int newfd);
asmlinkage long sys_epoll_create(int size);
asmlinkage long sys_inotify_init(void);
asmlinkage long sys_eventfd(unsigned int count);
asmlinkage long sys_signalfd(int ufd, sigset_t __user *user_mask, size_t sizemask);

/* __ARCH_WANT_SYSCALL_OFF_T */
asmlinkage long sys_sendfile(int out_fd, int in_fd,
        off_t __user *offset, size_t count);
asmlinkage long sys_newstat(const char __user *filename,
    struct stat __user *statbuf);
asmlinkage long sys_newlstat(const char __user *filename,
    struct stat __user *statbuf);
asmlinkage long sys_fadvise64(int fd, loff_t offset, size_t len, int advice);

/* __ARCH_WANT_SYSCALL_DEPRECATED */
asmlinkage long sys_alarm(unsigned int seconds);
asmlinkage long sys_getpgrp(void);
asmlinkage long sys_pause(void);
asmlinkage long sys_time(__kernel_old_time_t __user *tloc);
asmlinkage long sys_time32(old_time32_t __user *tloc);
#ifdef __ARCH_WANT_SYS_UTIME
asmlinkage long sys_utime(char __user *filename,
    struct utimbuf __user *times);
asmlinkage long sys_utimes(char __user *filename,
    struct __kernel_old_timeval __user *utimes);
asmlinkage long sys_futimesat(int dfd, const char __user *filename,
         struct __kernel_old_timeval __user *utimes);
#endif
asmlinkage long sys_futimesat_time32(unsigned int dfd,
         const char __user *filename,
         struct old_timeval32 __user *t);
asmlinkage long sys_utime32(const char __user *filename,
     struct old_utimbuf32 __user *t);
asmlinkage long sys_utimes_time32(const char __user *filename,
      struct old_timeval32 __user *t);
asmlinkage long sys_creat(const char __user *pathname, umode_t mode);
asmlinkage long sys_getdents(unsigned int fd,
    struct linux_dirent __user *dirent,
    unsigned int count);
asmlinkage long sys_select(int n, fd_set __user *inp, fd_set __user *outp,
   fd_set __user *exp, struct __kernel_old_timeval __user *tvp);
asmlinkage long sys_poll(struct pollfd __user *ufds, unsigned int nfds,
    int timeout);
asmlinkage long sys_epoll_wait(int epfd, struct epoll_event __user *events,
    int maxevents, int timeout);
asmlinkage long sys_ustat(unsigned dev, struct ustat __user *ubuf);
asmlinkage long sys_vfork(void);
asmlinkage long sys_recv(int, void __user *, size_t, unsigned);
asmlinkage long sys_send(int, void __user *, size_t, unsigned);
asmlinkage long sys_oldumount(char __user *name);
asmlinkage long sys_uselib(const char __user *library);
asmlinkage long sys_sysfs(int option,
    unsigned long arg1, unsigned long arg2);
asmlinkage long sys_fork(void);

/* obsolete: kernel/time/time.c */
asmlinkage long sys_stime(__kernel_old_time_t __user *tptr);
asmlinkage long sys_stime32(old_time32_t __user *tptr);

/* obsolete: kernel/signal.c */
asmlinkage long sys_sigpending(old_sigset_t __user *uset);
asmlinkage long sys_sigprocmask(int how, old_sigset_t __user *set,
    old_sigset_t __user *oset);
#ifdef CONFIG_OLD_SIGSUSPEND
asmlinkage long sys_sigsuspend(old_sigset_t mask);
#endif

#ifdef CONFIG_OLD_SIGSUSPEND3
asmlinkage long sys_sigsuspend(int unused1, int unused2, old_sigset_t mask);
#endif

#ifdef CONFIG_OLD_SIGACTION
asmlinkage long sys_sigaction(int, const struct old_sigaction __user *,
    struct old_sigaction __user *);
#endif
asmlinkage long sys_sgetmask(void);
asmlinkage long sys_ssetmask(int newmask);
asmlinkage long sys_signal(int sig, __sighandler_t handler);

/* obsolete: kernel/sched/core.c */
asmlinkage long sys_nice(int increment);

/* obsolete: kernel/kexec_file.c */
asmlinkage long sys_kexec_file_load(int kernel_fd, int initrd_fd,
        unsigned long cmdline_len,
        const char __user *cmdline_ptr,
        unsigned long flags);

/* obsolete: kernel/exit.c */
asmlinkage long sys_waitpid(pid_t pid, int __user *stat_addr, int options);

/* obsolete: kernel/uid16.c */
#ifdef CONFIG_HAVE_UID16
asmlinkage long sys_chown16(const char __user *filename,
    old_uid_t user, old_gid_t group);
asmlinkage long sys_lchown16(const char __user *filename,
    old_uid_t user, old_gid_t group);
asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group);
asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid);
asmlinkage long sys_setgid16(old_gid_t gid);
asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid);
asmlinkage long sys_setuid16(old_uid_t uid);
asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid);
asmlinkage long sys_getresuid16(old_uid_t __user *ruid,
    old_uid_t __user *euid, old_uid_t __user *suid);
asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid);
asmlinkage long sys_getresgid16(old_gid_t __user *rgid,
    old_gid_t __user *egid, old_gid_t __user *sgid);
asmlinkage long sys_setfsuid16(old_uid_t uid);
asmlinkage long sys_setfsgid16(old_gid_t gid);
asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist);
asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist);
asmlinkage long sys_getuid16(void);
asmlinkage long sys_geteuid16(void);
asmlinkage long sys_getgid16(void);
asmlinkage long sys_getegid16(void);
#endif

/* obsolete: net/socket.c */
asmlinkage long sys_socketcall(int call, unsigned long __user *args);

/* obsolete: fs/stat.c */
asmlinkage long sys_stat(const char __user *filename,
   struct __old_kernel_stat __user *statbuf);
asmlinkage long sys_lstat(const char __user *filename,
   struct __old_kernel_stat __user *statbuf);
asmlinkage long sys_fstat(unsigned int fd,
   struct __old_kernel_stat __user *statbuf);
asmlinkage long sys_readlink(const char __user *path,
    char __user *buf, int bufsiz);

/* obsolete: fs/select.c */
asmlinkage long sys_old_select(struct sel_arg_struct __user *arg);

/* obsolete: fs/readdir.c */
asmlinkage long sys_old_readdir(unsigned int, struct old_linux_dirent __user *, unsigned int);

/* obsolete: kernel/sys.c */
asmlinkage long sys_gethostname(char __user *name, int len);
asmlinkage long sys_uname(struct old_utsname __user *);
asmlinkage long sys_olduname(struct oldold_utsname __user *);
#ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT
asmlinkage long sys_old_getrlimit(unsigned int resource, struct rlimit __user *rlim);
#endif

/* obsolete: ipc */
asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second,
  unsigned long third, void __user *ptr, long fifth);

/* obsolete: mm/ */
asmlinkage long sys_mmap_pgoff(unsigned long addr, unsigned long len,
   unsigned long prot, unsigned long flags,
   unsigned long fd, unsigned long pgoff);
asmlinkage long sys_old_mmap(struct mmap_arg_struct __user *arg);

/*
 * Not a real system call, but a placeholder for syscalls which are
 * not implemented -- see kernel/sys_ni.c
 */
asmlinkage long sys_ni_syscall(void);

#endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
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原始发表：2022-07-02，如有侵权请联系 cloudcommunity@tencent.com 删除
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