restart_syscall - restart a system call after interruption by a stop signal
: There is no glibc wrapper for this system call; see NOTES.
() system call is used to restart certain system calls
after a process that was stopped by a signal (e.g., SIGSTOP
) is later resumed after receiving a SIGCONT
system call is designed only for internal use by the kernel.
() is used for restarting only those system calls that,
when restarted, should adjust their time-related parameters—namely
(since Linux 2.6.24), nanosleep(2)
(since Linux 2.6),
(since Linux 2.6), and futex(2)
employed with the FUTEX_WAIT
(since Linux 2.6.22) and
(since Linux 2.6.31) operations.
() 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
The return value of restart_syscall
() is the return value of whatever
system call is being restarted.
is set as per the errors for whatever system call is being
restarted by restart_syscall
() system call is present since Linux 2.6.
This system call is Linux-specific.
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)
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.
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