#include <miniOS/types.h>

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Classes
struct	mini_sigaction

Macros
#define	SIGHUP 1 /* hangup */
#define	SIGINT 2 /* interrupt (Ctrl-C) */
#define	SIGQUIT 3 /* quit (Ctrl-\‍) */
#define	SIGILL 4 /* illegal instruction */
#define	SIGABRT 6 /* abort */
#define	SIGTRAP 5 /* breakpoint/single-step trap (ptrace) */
#define	SIGFPE 8 /* floating-point exception */
#define	SIGKILL 9 /* unconditional termination; cannot be caught or ignored */
#define	SIGSEGV 11 /* segmentation fault */
#define	SIGPIPE 13 /* broken pipe */
#define	SIGALRM 14 /* alarm clock (ITIMER_REAL expiry) */
#define	SIGTERM 15 /* termination request; default action terminates process */
#define	SIGCHLD 17 /* sent to parent when a child exits or stops (Linux ABI) */
#define	SIGCONT 18 /* continue if stopped */
#define	SIGSTOP 19 /* stop (cannot be caught or ignored) */
#define	SIGTSTP 20 /* terminal stop (Ctrl-Z) */
#define	SIG_DFL ((sighandler_t)0) /* default signal action */
#define	SIG_IGN ((sighandler_t)1) /* ignore signal */
#define	MINIOS_SA_NOCLDWAIT 0x00000002U /* do not produce zombies; skip SIGCHLD delivery */
#define	MINIOS_SA_RESTART 0x10000000U /* restart interrupted syscall on signal return */
#define	MINIOS_SA_RESETHAND 0x80000000U /* reset to SIG_DFL on delivery */

Typedefs
typedef void(*	sighandler_t) (int signum)
typedef uint32_t	minisigset_t
typedef struct mini_sigaction	mini_sigaction_t

Functions
void	signal_dispatch (void)
void	ring3_invoke_handler (int sig, sighandler_t handler)

Macro Definition Documentation

◆ MINIOS_SA_NOCLDWAIT

#define MINIOS_SA_NOCLDWAIT 0x00000002U /* do not produce zombies; skip SIGCHLD delivery */

◆ MINIOS_SA_RESETHAND

#define MINIOS_SA_RESETHAND 0x80000000U /* reset to SIG_DFL on delivery */

◆ MINIOS_SA_RESTART

#define MINIOS_SA_RESTART 0x10000000U /* restart interrupted syscall on signal return */

◆ SIG_DFL

#define SIG_DFL ((sighandler_t)0) /* default signal action */

◆ SIG_IGN

#define SIG_IGN ((sighandler_t)1) /* ignore signal */

◆ SIGABRT

#define SIGABRT 6 /* abort */

◆ SIGALRM

#define SIGALRM 14 /* alarm clock (ITIMER_REAL expiry) */

◆ SIGCHLD

#define SIGCHLD 17 /* sent to parent when a child exits or stops (Linux ABI) */

◆ SIGCONT

#define SIGCONT 18 /* continue if stopped */

◆ SIGFPE

#define SIGFPE 8 /* floating-point exception */

◆ SIGHUP

#define SIGHUP 1 /* hangup */

◆ SIGILL

#define SIGILL 4 /* illegal instruction */

◆ SIGINT

#define SIGINT 2 /* interrupt (Ctrl-C) */

◆ SIGKILL

#define SIGKILL 9 /* unconditional termination; cannot be caught or ignored */

◆ SIGPIPE

#define SIGPIPE 13 /* broken pipe */

◆ SIGQUIT

#define SIGQUIT 3 /* quit (Ctrl-\‍) */

◆ SIGSEGV

#define SIGSEGV 11 /* segmentation fault */

◆ SIGSTOP

#define SIGSTOP 19 /* stop (cannot be caught or ignored) */

◆ SIGTERM

#define SIGTERM 15 /* termination request; default action terminates process */

◆ SIGTRAP

#define SIGTRAP 5 /* breakpoint/single-step trap (ptrace) */

◆ SIGTSTP

#define SIGTSTP 20 /* terminal stop (Ctrl-Z) */

Typedef Documentation

◆ mini_sigaction_t

typedef struct mini_sigaction mini_sigaction_t

mini_sigaction_t — per-signal disposition record.

Stored in struct thread::signal_actions[1..31]. sa_flags holds MINIOS_SA_RESTART and other SA_* flags. sa_mask is reserved (zero) — miniOS does not block signals during handlers yet.

◆ minisigset_t

typedef uint32_t minisigset_t

◆ sighandler_t

typedef void(* sighandler_t) (int signum)

Function Documentation

◆ ring3_invoke_handler()

void ring3_invoke_handler	(	int	sig,
		sighandler_t	handler )

ring3_invoke_handler() - Set up user stack to invoke a signal handler. @sig: Signal number passed as first argument to handler (RDI per SysV ABI). @handler: User-mode function pointer to invoke.

Modifies the current thread's saved_user_rip to point to @handler and adjusts saved_user_rsp to push the signal number onto the user stack. SYSRET then jumps directly into the handler. Full trampoline (return path via SYS_sigreturn).

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◆ signal_dispatch()

void signal_dispatch ( void )

signal_dispatch() - Deliver all pending signals before returning to userspace.

Called from syscall.asm immediately before SYSRET. Scans the current thread's pending_signals bitmask (bits 1-31). For SIGKILL and SIGTERM calls sched_exit_current(128 + signum). For other signals invokes the registered handler via ring3_invoke_handler() if a non-default handler is registered, otherwise clears the pending bit and continues.

Context: Called with interrupts disabled (CLI before SYSRET path). Does not return if SIGKILL or SIGTERM is pending.