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    Command:

    restart_syscall

    
    
    
    

    SYNOPSIS

           int restart_syscall(void);
    
           Note: There is no glibc wrapper for this system call; see NOTES.
    
    
    

    DESCRIPTION

           The restart_syscall() system call is used  to  restart  certain  system
           calls  after  a  process that was stopped by a signal (e.g., SIGSTOP or
           SIGTSTP) is later resumed after receiving a SIGCONT signal.  This  sys-
           tem call is designed only for internal use by the kernel.
    
           restart_syscall()  is used for restarting only those system calls that,
           when restarted,  should  adjust  their  time-related  parameters--namely
           poll(2)   (since   Linux   2.6.24),  nanosleep(2)  (since  Linux  2.6),
           clock_nanosleep(2) (since Linux 2.6), and futex(2), when employed  with
           the  FUTEX_WAIT (since Linux 2.6.22) and FUTEX_WAIT_BITSET (since Linux
           2.6.31) operations.  restart_syscall() restarts the interrupted  system
           call  with a time argument that is suitably adjusted to account for the
           time that has already elapsed (including the time where the process was
           stopped   by  a  signal).   Without  the  restart_syscall()  mechanism,
           restarting these system calls would not correctly  deduce  the  already
           elapsed time when the process continued execution.
    
    
    

    RETURN VALUE

           The  return  value of restart_syscall() is the return value of whatever
           system call is being restarted.
    
    
    

    ERRORS

           errno is set as per the  errors  for  whatever  system  call  is  being
           restarted by restart_syscall().
    
    
    

    VERSIONS

           The restart_syscall() system call is present since Linux 2.6.
    
    
    

    CONFORMING TO

           This system call is Linux-specific.
    
    
    

    NOTES

           There  is no glibc wrapper for this system call, because it is intended
           for use only by the kernel and should never be called by  applications.
    
           From user space, the operation of restart_syscall(2) is largely invisi-
           ble: to the process that made the system call  that  is  restarted,  it
           appears  as  though that system call executed and returned in the usual
           fashion.
    
    
    

    SEE ALSO

           sigaction(2), sigreturn(2), signal(7)
    
    
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