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-.\" Copyright (c) 2013 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" http://thread.gmane.org/gmane.linux.kernel/76552/focus=76803
-.\" From: Linus Torvalds <torvalds <at> transmeta.com>
-.\" Subject: Re: [PATCH] compatibility syscall layer (lets try again)
-.\" Newsgroups: gmane.linux.kernel
-.\" Date: 2002-12-05 02:51:12 GMT
-.\"
-.\" See also Section 11.3.3 of Understanding the Linux Kernel, 3rd edition
-.\"
-.TH restart_syscall 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-restart_syscall \- restart a system call after interruption by a stop signal
-.SH SYNOPSIS
-.nf
-.B long restart_syscall(void);
-.fi
-.P
-.IR Note :
-There is no glibc wrapper for this system call; see NOTES.
-.SH DESCRIPTION
-The
-.BR restart_syscall ()
-system call is used to restart certain system calls
-after a process that was stopped by a signal (e.g.,
-.B SIGSTOP
-or
-.BR SIGTSTP )
-is later resumed after receiving a
-.B SIGCONT
-signal.
-This system call is designed only for internal use by the kernel.
-.P
-.BR restart_syscall ()
-is used for restarting only those system calls that,
-when restarted, should adjust their time-related parameters\[em]namely
-.BR poll (2)
-(since Linux 2.6.24),
-.BR nanosleep (2)
-(since Linux 2.6),
-.BR clock_nanosleep (2)
-(since Linux 2.6),
-and
-.BR futex (2),
-when employed with the
-.B FUTEX_WAIT
-(since Linux 2.6.22)
-and
-.B FUTEX_WAIT_BITSET
-(since Linux 2.6.31)
-operations.
-.\" These system calls correspond to the special internal errno value
-.\" ERESTART_RESTARTBLOCK. Each of the system calls has a "restart"
-.\" helper function that is invoked by restart_syscall().
-.\" Notable (as at Linux 3.17) is that poll() has such a "restart"
-.\" function, but ppoll(), select(), and pselect() do not.
-.\" This means that the latter system calls do not take account of the
-.\" time spent in the stopped state when restarting.
-.BR 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
-.BR restart_syscall ()
-mechanism, restarting these system calls would not correctly deduct the
-already elapsed time when the process continued execution.
-.SH RETURN VALUE
-The return value of
-.BR restart_syscall ()
-is the return value of whatever system call is being restarted.
-.SH ERRORS
-.I errno
-is set as per the errors for whatever system call is being restarted by
-.BR restart_syscall ().
-.SH STANDARDS
-Linux.
-.SH HISTORY
-Linux 2.6.
-.SH 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.
-.P
-The kernel uses
-.BR restart_syscall ()
-to ensure that when a system call is restarted
-after a process has been stopped by a signal and then resumed by
-.BR SIGCONT ,
-then the time that the process spent in the stopped state is counted
-against the timeout interval specified in the original system call.
-In the case of system calls that take a timeout argument and
-automatically restart after a stop signal plus
-.BR SIGCONT ,
-but which do not have the
-.BR restart_syscall ()
-mechanism built in, then, after the process resumes execution,
-the time that the process spent in the stop state is
-.I not
-counted against the timeout value.
-Notable examples of system calls that suffer this problem are
-.BR ppoll (2),
-.BR select (2),
-and
-.BR pselect (2).
-.P
-From user space, the operation of
-.BR restart_syscall ()
-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.
-.SH SEE ALSO
-.BR sigaction (2),
-.BR sigreturn (2),
-.BR signal (7)
-.\" FIXME . ppoll(2), select(2), and pselect(2)
-.\"     should probably get the restart_syscall() treatment:
-.\"     If a select() call is suspended by stop-sig+SIGCONT, the time
-.\"     spent suspended is *not* deducted when the select() is restarted.
-.\" FIXME . check whether recvmmsg() handles stop-sig+SIGCONT properly.