• Signal handlers
• Restart semantics
• SIG_IGN signals restarting blocked syscalls on non-main threads
• ABRT (core-dumping signals?)
• Tentative algorithm
• Example
• Ignore (or no handler)
• Default semantics (no SA_RESTART), one level of interrupt
• SA_RESTART, one level of interrupt
• Default semantics (no SA_RESTART), two levels of interrupt
• SA_RESTART, two levels of interrupt
• SA_RESTART, two levels of interrupt, three writes to read() calls