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NAME

       restart_syscall  -  restart  a system call after interruption by a stop
       signal

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
       system 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
       invisible:  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)

COLOPHON

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



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