sigint

seconds to send a SIGINT signal to the child process. The child process captures the signal, and the signal processing function is processed. $parentPid = Posix_getpid (); echo "Parent Progress pid:{$parentPid}\n"; Defines a signal handler function Sighandler ($signo) { $pid = Posix_getpid (); echo "{$pid} Progress,oh No, I ' m killed!\n"; Exit (1);} $pid = Pcntl_fork (), if ($pid = =-1) { //Create failed exit ("fork Progress error!\n"

$ Kill-l1) quit) SIGINT3) SIGQUIT4) SIGILL5) SIGTRAP6) SIGABRT7) SIGBUS8) quit) SIGKILL10) quit) SIGSEGV12) SIGUSR213) quit) SIGALRM15) SIGT... $ kill-l 1) SIGHUP 2) SIGINT 3) SIGQUIT 4) SIGILL 5) SIGTRAP 6) SIGABRT 7) SIGBUS 8) SIGFPE 9) SIGKILL 10) SIGUSR1 11) SIGSEGV 12) SIGUSR2 13) SIGPIPE 14) SIGALRM 15) SIGTERM 16) SIGSTKFLT 17) SIGCHLD 18) SIGCONT 19) SIGSTOP 20) SIGTSTP 21) SIGTTIN 22) SIGTTOU 23) SIGURG 24) SIGXCPU 25) SIGXFSZ 26) SIGVTALRM 2

A) generation: Keys, hardware exceptions, and kill functions send signalsB) Common signals:1. SIGHUP: end signal2. SIGINT: the interrupt signal ctrl + c3. SIGKILL: end the process of receiving signals4. SIGTERM: signal sent by the KILL command5. SIGCHLD: indicates the signal that the sub-process stops or stops.6. SIGSTOP: Stop SignalC) signal processing:1. Ignore this signal: In addition to SIGKILL, SIGSTOP2. Execute the desired action:3. Execute the

Libevent, as the network IO library in unix/linux, efficiently integrates IO events, Timeout events, and signal events. This article mainly describes the ins and outs of Integrated signal events. First paste the code of the client application signal event: static void signal_cb (int fd, short event, void * arg) {struct event * signal = arg; printf ("% s: got signal % d \ n ", _ func __, EVENT_SIGNAL (signal); if (called> = 2) event_del (signal); called ++ ;} int main (int argc, char ** argv) {st

How the signal is generated:1. Keyboard inputIf CTRL + C means a SIGINT signal is generated2. Abnormal signal generationThis is the case when the program executes to 2/0, the read segment of the pipe is closed and the write end still writes data to the pipeline ...3. Send a signal to the specified process by commandHow to handle the signal:1. Ignore2. Perform default processing (usually terminating program)3. Perform a custom action (capture of the si

Once, it was tortured by the system () function, because the system () function was not well understood. Simply knowing that using this function to execute a system command is not enough, it is not sufficient, its return value, the return value of the command it executes, and the reason for the failure of the command execution, which is the point. Originally because of this function risk is more, so abandon not use, use other method. Let's not say what I'm using here, it's important to understan

We can use Kill-l to see all the semaphore interpretations, but we don't see the explanation for signal 0.[[Email protected]~]# kill-l 1] SIGHUP 2) SIGINT 3) sigquit 4) Sigill 5) SIGTRAP 6) SIGABRT 7) Sigbus SIGFPE 9) SIGKILL) SIGUSR1) SIGSEGV SIGUSR213) sigpipe) sigalrm) SIGTERM 17) SIGCHLD18) (Sigcont) (SIGSTOP) SIGTSTP) SIGTTIN22) Sigttou) Sigurg 25 ) (SIGXFSZ26) (SIGVTALRM) sigprof) sigwinch SIGIO30) SIGPWR

Before looking at the signal, there is not much attention to the comparison of different signals. When I see it again today, I suddenly feel very similar to some of the signals, and even very easy to confuse. Let's take a moment to summarize this weekend.first, close the process signalThe common 4 off process signal is sigkill,sigint,sigterm,sigquit. SIGKILL, which is used to close processes, cannot be captured or ignored. The scenario is tha

function. The return value type of the signal function is the same as the parameter func, which is a pointer to a function that has a null return value with an integer argument. Its correct return value should be the last time the signal was processed. Error returning Sig_errThe signal example is as follows:[CPP]View Plaincopyprint? #include #include #include #include void func (int sig) { printf ("I get asignal!\n"); } int main () {charbuffer[100]; if

) = =-1) return sig_err; return Oldact.sa_handler;}Sa_mask OptionsSA_MASK Specifies a mask of signals which should be blocked/** specifies a mask for the signal set in which the signal in this mask will be blocked **/(i.e., added to the SI Gnal Mask of the thread in which, the signal handler is invoked)During execution of the signal handler. In addition, the signal which triggered the handler would be blocked,Unless the SA_NODEFER flag is used./** when executing handler, if the process

interrupt processing program is running under the kernel mentality;(3) The interrupt response is timely, and the signal response usually has a large time delay .Common signals Signal Name Describe SIGABRT (6) Process stops running Sigalrm Warning Clock SIGFPE Calculate an operation exception (e.g., except 0) SIGHUP System hangs up Sigill Illegal instructions

has different type definitions in different systems, so it is best to refer to the online manual for this format.In the call, the parameter Signum indicates the signal to set the processing method. The second parameter, handler, is a handler function, orSig_ign: Ignores the signal indicated by the parameter signum.SIG_DFL: The default value is the processing method of the signal Signum by the recovery parameter.The integer parameter passed to the signal processing routine is the signal value, w

)Third, perform the system default action; (The system default action for most signals is to terminate the process)Signal Sending: (main function has kill and raise)Difference: Kill You can either send a signal to itself or send a signal to another process, Raise is to send a signal to the process itself. int Kill (pid_t pid, int signo)int raise (int signo)Alarm Way to send: Use the alarm function to set a time value that generates a sigalrm signal when the time set is reached . If this signal

SIGUSR1 Terminate process, user-defined signal 1 SIGUSR2 Terminate process, user-defined signal 2 SIGINT Terminating a process, interrupting a process Sigquit Build the core file to terminate the process and generate the core file There are some differences in the Windows platform, and some of its signals are shown in the following examples: Sig

1. Signal Processing functionThe related function prototypes are as follows:#include How the process handles the signal (the early signal processing mechanism):The process can tell the kernel how to handle the signal through the signal system call.1. Accept the default processingProcessing signal (SIGINT,SIG_DFL) According to the original intent area of the signal2. Ignore the signalSignal (sigint,sig_ign)

namespacestd;intG_sigid;voidHandle_sigint (int) {printf ("[Singal]: catched ctrl+c\n"); G_sigid= -;}intMain () {//signal (SIGINT, handle_sigint); structsigaction SIGHDL; Sighdl.sa_handler=Handle_sigint; Sigemptyset (sighdl.sa_mask); Sighdl.sa_flags=0; Sigaction (SIGINT,SIGHDL, NULL); inti =1; while(i) {printf ("i=%d\n", i++); if(g_sigid== -) { Break; } Sleep (

default mode.There are two main ways to deal with §§ signal, one is to use simple signal function, and the other is to use the set of signal set function.Signal#includevoid(*signal(int signo,void(*func)(int)))(int)//可以理解为//typedef void(*sighandler_t)(int)//sighandler_t signal(int signum,sighandler_t handler)The Func may be:1. Sig_ign: Ignore this signal2, Sig_del: According to the system default mode processing3. Signal Processing function Name: Use this function to handle#include #include #inc

signal 2 SIGINT Terminating a process, interrupting a process Sigquit Build the core file to terminate the process and generate the core file There are some differences in the Windows platform, and some of its signals are as follows: SIGINT (CTRL + C interrupt), Sigill, SIGTERM (software termination with Kill), Sigbreak (Ctrl+break interrupt).Signal selection:

to its original, and then calls the handler function. Stevens in the UNIX Environment Advanced Programming book, "If a signal is caught and if the signal handler returns, then Sigsuspend returns and the Signal mask of the "process is" set to its value before the called to Sigsuspend. "Because the Sigsuspend is atomic operation, so this is the feeling of the first call signal hand Ler first returns, then Sigsuspend returns. int main (void) {sigset_t newmask, oldmask, Zeromask;

) {Curl_config_set (' Downtimeout ', $downtimeout);} process.lib.php The code is as follows Copy Code if (Php_sapi_name ()!= ' CLI ') {Return} DECLARE (ticks = 1); Interrupt Signal$signals = Array (SIGINT => "SIGINT",Sighup => "Sighup",Sigquit => "Sigquit"); command Line Color output$colors [' red '] = "\33[31m";$colors [' green '] = "\33[32m";$colors [' yell