signal.h

sigaltstack

Describes a signal stack.

__ucontext

Describes the user execution context.

__sigset_t

Defines a signal set.

sigaction

Defines the signal processing actions and related attributes. You can use the structures to change the processing actions or attributes.

sigaltstack

Describes a signal stack.

sigval

Describes signal values in different cases.

__si_fields

Describes signal information.

sigaction

Defines the signal processing actions and related attributes. You can use the structures to change the processing actions or attributes.

sigevent

Describes asynchronous notifications.

SA_NOCLDSTOP 1

Stops a child process without sending the SIGCHLD signal.

SA_NOCLDWAIT 2

Sets the SIGCHLD flag to prevent zombie processes.

SA_SIGINFO 4

Transfers the siginfo_t structure with the signal.

SA_ONSTACK 0x08000000

Uses the signal stack specified by sigaltstack for signal processing.

SA_RESTART 0x10000000

Obtains the restart signal.

SA_NODEFER 0x40000000

The signals being processed are not masked during signal processing.

SA_RESETHAND 0x80000000

The default processing mode is restored after the signal processing is complete.

SA_RESTORER 0x04000000

Not intended for application use. This flag is used by C libraries to indicate that the sa_restorer field contains the address of a trampoline.

MINSIGSTKSZ 2048

Defines the minimum size of the replaceable signal stack.

SIGSTKSZ 8192

Defines the size of a signal stack.

_NSIG 65

Number of supported signals.

_NSIG_BPW __BITS_PER_LONG

Number of bits occupied by a word.

_NSIG_WORDS (_NSIG / _NSIG_BPW)

Number of words required by all signals.

SIGHUP 1

Hangs up a process.

SIGINT 2

Interrupts a process from keyboard.

SIGQUIT 3

Exits a process from keyboard. A core file is generated.

SIGILL 4

Illegal instruction.

SIGTRAP 5

Breakpoint, used for debugging.

SIGABRT 6

Abnormal termination.

SIGIOT 6

Equivalent to SIGABRT.

SIGBUS 7

Invalid address access.

SIGFPE 8

Floating-point exceptions.

SIGKILL 9

Forcibly stops a process.

SIGUSR1 10

User-defined signal 1.

SIGSEGV 11

Illegal memory access.

SIGUSR2 12

User-defined signal 2.

SIGPIPE 13

The pipe is broken.

SIGALRM 14

Timer signal.

SIGTERM 15

Termination signal.

SIGSTKFLT 16

Coprocessor stack error.

SIGCHLD 17

Child process terminated or stopped.

SIGCONT 18

Resumes a suspended process.

SIGSTOP 19

Suspends a process.

SIGTSTP 20

Stops a process by entering the command on the terminal.

SIGTTIN 21

Input required by the background process.

SIGTTOU 22

Output required by the background process.

SIGURG 23

Urgent socket condition.

SIGXCPU 24

CPU time limit exceeded.

SIGXFSZ 25

File size limit exceeded.

SIGVTALRM 26

Virtual timer, used to calculate the CPU occupation time of a process.

SIGPROF 27

Calculates the CPU time occupied by a process and the system calling time.

SIGWINCH 28

Window size change.

SIGIO 29

Input/Output.

SIGPOLL SIGIO

Equivalent to SIGIO.

SIGPWR 30

Power failure.

SIGSYS 31

Non-existent system call.

SIGUNUSED 31

Equivalent to SIGSYS.

SIGRTMIN 32

Start of a reliable signal.

SIGRTMAX _NSIG

End of a reliable signal.

SA_NOCLDSTOP 0x00000001

Stops a child process without sending the SIGCHLD signal.

SA_NOCLDWAIT 0x00000002

Sets the SIGCHLD flag to prevent zombie processes.

SA_SIGINFO 0x00000004

Transfers the siginfo_t structure with the signal.

SA_THIRTYTWO 0x02000000

Transfers signals in a 32-bit mode even if the task runs in a 26-bit mode.

SA_RESTORER 0x04000000

Not intended for application use. This flag is used by C libraries to indicate that the sa_restorer field contains the address of a trampoline.

SA_ONSTACK 0x08000000

Uses the signal stack specified by sigaltstack for signal processing.

SA_RESTART 0x10000000

Obtains the restart signal.

SA_NODEFER 0x40000000

The signals being processed are not masked during signal processing.

SA_RESETHAND 0x80000000

The default processing mode is restored after the signal processing is complete.

SA_NOMASK SA_NODEFER

Signals being processed are not masked during signal processing.

SA_ONESHOT SA_RESETHAND

The default processing mode is restored after the signal processing is complete.

MINSIGSTKSZ 2048

Defines the minimum size of the replaceable signal stack.

SIGSTKSZ 8192

Defines the size of a signal stack.

SIG_BLOCK 0

Defines the function behaviors such as sigprocmask() and pthread_sigmask(), which are used to add signals to the mask set.

SIG_UNBLOCK 1

Defines the function behaviors such as sigprocmask() and pthread_sigmask(), which are used to remove signals from the mask set.

SIG_SETMASK 2

Defines the function behaviors such as sigprocmask() and pthread_sigmask(), which are used to set the mask set.

sa_handler _u._sa_handler

Defines the simplified writing used to indicate the __sa_handler.sa_handler field in sigaction.

sa_sigaction _u._sa_sigaction

Defines the simplified writing used to indicate the __sa_handler.sa_sigaction field in sigaction.

SIG_HOLD ((void (*)(int)) 2)

Defines the function behaviors such as sigset() and adds a specified signal to the process signal mask without changing the current processing mode of the signal.

sa_handler __sa_handler.sa_handler

Defines the simplified writing used to indicate the __sa_handler.sa_handler field in sigaction.

sa_sigaction __sa_handler.sa_sigaction

Defines the simplified writing used to indicate the __sa_handler.sa_sigaction field in sigaction.

SIGEV_SIGNAL 0

Sets the notification method in sigevent: signal notification.

SIGEV_NONE 1

Sets the notification method in sigevent: no notification.

SIGEV_THREAD 2

Sets the notification method in sigevent: thread notification.

SIGRTMIN (__libc_current_sigrtmin())

Start of a reliable signal.

SIGRTMAX (__libc_current_sigrtmax())

End of a reliable signal.

SIG_ERR ((__sighandler_t)-1)

Defines the value returned when a function such as signal() fails.

SIG_DFL ((__sighandler_t)0)

Defines the default signal processing mode.

SIG_IGN ((__sighandler_t)1)

Defines the signal processing mode in which the signal is ignored.

ucontext_t

typedef struct __ucontext

Describes the user execution context.

stack_t

typedef struct sigaltstack

Describes a signal stack.

sighandler_t) (int)

typedef void(*

Function pointer of signal handler.

kill (pid_t pid, int sig)

int

Sends a signal to a specified process.

sigemptyset (sigset_t *set)

int

Clears all signals in a specified signal set.

sigfillset (sigset_t *set)

int

Adds all signals to a specified signal set.

sigaddset (sigset_t *set, int signum)

int

Adds a signal to a specified signal set.

sigdelset (sigset_t *set, int signum)

int

Delete a signal from a specified signal set.

sigismember (const sigset_t *set, int signum)

int

Checks whether a signal is in the signal set.

sigprocmask (int how, const sigset_t *__restrict set, sigset_t *__restrict oldset)

int

Changes the signal mask of the calling thread.

sigsuspend (const sigset_t *mask)

int

Sets mask as the signal mask set of the current process and suspends the process until a signal processing action is triggered.

sigaction (int signum, const struct sigaction *__restrict act, struct sigaction *__restrict oldact)

int

Checks or changes the processing action associated with a specified signal. Do not use the process creation function or thread creation function in the registered callback processing function. Otherwise, the process is abnormal. For example, do not use the fork or pthread_create function.

sigpending (sigset_t *set)

int

Obtains the signal suspended by the current thread.

sigwait (const sigset_t *__restrict set, int *__restrict sig)

int

Suspends the calling thread and waits for the signal.

sigwaitinfo (const sigset_t *__restrict set, siginfo_t *__restrict info)

int

Suspends the calling thread and waits for the signal, with a timeout period specified.

sigtimedwait (const sigset_t *__restrict set, siginfo_t *__restrict info, const struct timespec *__restrict timeout)

int

Suspends the calling thread and waits for the signal, with a timeout period specified.

pthread_sigmask (int how, const sigset_t *__restrict set, sigset_t *__restrict oldset)

int

Checks or changes the signal mask of the calling thread.

psignal (int signum, const char *s)

void

Prints signal information.

sigpause (int signum)

int

Deletes the signal specified by signum from the signal mask of the calling process and suspends the process until the signal is received.

sighold (int signum)

int

Adds the signal specified by signum to the signal mask of the calling process.

sigrelse (int signum)

int

Deletes the signal specified by signum from the signal mask of the calling process.

sigisemptyset (const sigset_t *set)

int

Checks whether the signal set is empty.

sigorset (sigset_t *dest, const sigset_t *left, const sigset_t *right)

int

Adds the union set of left and right to dest.

sigandset (sigset_t *dest, const sigset_t *left, const sigset_t *right)

int

Adds the intersection of left and right to dest.

signal (int signum, sighandler_t handler)

sighandler_t

Changes the processing action of a specified signal. Do not use the process creation function or thread creation function in the registered callback processing function. Otherwise, the process is abnormal. For example, do not use the fork or pthread_create function.

raise (int signum)

int

Sends a signal to the calling process.