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caught_signal_return

detcore::signal_restart

Function caught_signal_return 

Source 
pub fn caught_signal_return(result: i64, sa_flags: u64) -> CaughtSignalReturn
Expand description

The syscall’s outcome when a caught signal whose action has sa_flags is delivered at its return with raw result result (an errno as its negative): Linux’s handle_signal, arch/x86/kernel/signal.c v6.12 lines 264-282, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/x86/kernel/signal.c?h=v6.12#n264:

  • -ERESTART_RESTARTBLOCK and -ERESTARTNOHAND return -EINTR;
  • -ERESTARTSYS returns -EINTR without SA_RESTART, and restarts with it;
  • -ERESTARTNOINTR restarts, whatever the flags;
  • any other result is returned as it is.

Only for the first caught delivery at the return. With no handler at all, the kernel restarts instead (lines 343-357): -ERESTARTNOHAND, -ERESTARTSYS and -ERESTARTNOINTR run the same call again, and -ERESTART_RESTARTBLOCK runs restart_syscall (lines 353-356), not the same call. Neither that case nor a default-fatal delivery, which ends the process, comes here.