Linux signal Interpretation (2)

My knowledge is not deep, the following content is on-line harvesting for future use.

Signal	Signal Detail Description	Concise Description	processing Mode
1) SIGHUP	This signal is issued at the end of the user terminal connection (normal or abnormal), usually at the end of the control process of the terminal to notify the same session of the various jobs, when they are no longer associated with the control terminal.	Connection Hang-off	Terminate (default processing)
2) SIGINT	A program termination (interrupt) signal, issued when the user types the intr character (usually ctrl-c), to inform the foreground process group that the process is terminated.	Terminal Interrupt, CTRL + C to generate the signal	Termination (Terminate)
3) Sigquit	Similar to SIGINT, but controlled by the quit character (usually ctrl-/). The process generates a core file when it receives a sigquit exit, similar to a program error signal in this sense	Terminal exit, ctrl+| termination + dump
4) Sigill	An illegal instruction was executed. This is usually due to an error in the executable file itself or an attempt to execute a data segment. This signal can also be generated when a stack overflows.	The process attempted to execute an illegal instruction	Terminate + Dump
5) SIGTRAP	Generated by a breakpoint instruction or other trap instruction. Used by debugger.	Enter Breakpoint	Terminate + Dump
6) SIGABRT	Invokes the signal generated by the abort function.	Process abnormally terminated, abort () generated	Terminate + Dump
7) Sigbus	Illegal address, including memory address alignment (alignment) error. For example, a four-word integer is accessed, but its address is not a multiple of 4. It differs from SIGSEGV in that the latter is triggered by illegal access to a legitimate storage address (such as Access does not belong to its own storage space or read-only storage space).	Hardware or alignment errors	Terminate + Dump
8) SIGFPE	Emitted when a fatal arithmetic operation error occurs. This includes not only floating-point arithmetic errors, but also all other arithmetic errors such as overflow and divisor 0.	Floating-Point Arithmetic exception	Terminate + Dump
9) SIGKILL	Used to immediately end the run of the program. This signal cannot be blocked, processed, or ignored. If an administrator discovers that a process is not terminating, try sending this signal.	Stop signals that can not be captured or ignored	Terminate
) SIGUSR1	Leave it to the user	User-defined Signal 1	Terminate
One) SIGSEGV	An attempt was made to access memory that is not assigned to itself or to write data to a memory address that does not have write permissions.	Invalid memory segment Access =>segmentation error	Terminate
SIGUSR2)	Leave it to the user	User-defined Signal 2	Terminate
Sigpipe)	Pipe rupture. This signal is usually generated between interprocess communication, such as two processes with FIFO (pipeline) communication, the read pipeline is not opened or terminated unexpectedly to the pipeline to write, the writing process will receive sigpipe signal. In addition, two processes with the socket communication, the write process when the socket is written, the read process has been terminated.	Writes to a pipe that is closed on the read side	Terminate
SIGALRM)	A clock timing signal that calculates the actual time or clock time. The alarm function uses this signal.	Real timer expires, alarm () generated	Terminate
SIGTERM)	The end of program (terminate) signal, unlike Sigkill, is that the signal can be blocked and processed. Typically used to require the program to exit gracefully, the shell command kill generates this signal by default. If the process does not stop, we will try to Sigkill.	Termination signals that can be captured or ignored	Terminate
Sigstkflt)	Coprocessor Stack Error	Coprocessor Stack Error	Terminate
SIGCHLD)	The parent process receives this signal at the end of the child process.	Child process has stopped and is useful for managing child processes	Ignore
) Sigcont	Let a stop (stopped) process continue execution. This signal cannot be blocked. You can use a handler to get the program to do certain work when the stopped state changes to continue. For example, to re-display the prompt	Continue execution of the pause process (typically not used by the user)	Ignore
SIGSTOP)	Stop (stopped) the execution of the process. Notice the difference between it and terminate and interrupt: The process is not over yet, just pause execution. This signal cannot be blocked, processed or ignored.	Stop signals that cannot be captured or ignored	Stop it
SIGTSTP)	Stops the process from running, but the signal can be processed and ignored. This signal is emitted when the user types Susp characters (usually ctrl-z)	Terminal hangs, user-generated stop character (ctrl + Z)	Stop it
) Sigttin	When a background job wants to read data from the user terminal, all processes in the job receive a sigttin signal. By default, these processes stop executing.	Background process Read Control terminal	Stop it
Sigttou)	Similar to Sigttin, but received when writing a terminal (or modifying terminal mode).	Background process Write control terminal	Stop it
Sigurg)	When there is "emergency" data or Out-of-band data arrives at the socket.	Emergency I/O not processed	Ignore
) sigxcpu	CPU time resource limit exceeded. This restriction can be read/changed by Getrlimit/setrlimit.	Process Resource Overrun	Terminate + Dump
SIGXFSZ)	When the process attempts to enlarge the file so that it exceeds the file size resource limit.	File Resource Overrun	Terminate + Dump
SIGVTALRM)	Virtual clock signal. is similar to SIGALRM, but calculates the CPU time that is consumed by the process.	Virtual Timer expires	Terminate
SIGPROF)	Similar to SIGALRM/SIGVTALRM, but includes the CPU time used by the process and the time of the system call.	Utility Timer Expiry	Terminate
Sigwinch)	emitted when the window size changes.	Control terminal window Size change	Ignore
) SIGIO	The file descriptor is ready to start the input/output operation.	asynchronous I/O events	Terminate
SIGPWR)	Power failure	Power	Terminate
Sigsys)	An illegal system call.	The process attempted to execute an invalid system call	Terminate + Dump

Signal so much, in fact, mainly remember the usual number of signals is good.

Signal	Signal Description
SIGINT	Generated under Ctrl-c terminal
Sigabrt	Generate SIGABRT Signal
Sigalrm	By timers such as alarm ()
SIGCHLD	Send to parent process after child process ends
Sigbus	Bus error
SIGKILL	Must kill the signal
Sigpipe	Pipe breakage
SIGIO	Registering I/O events with Fcntl
Sigquit	Ctrl-\ generated under the terminal
SIGSEGV	Invalid access to memory causes a common "segment error" to terminate the current process
SIGSTOP	Must stop the signal, cannot be blocked, cannot be captured
SIGTERM	Standard signal to terminate process

Linux signal Interpretation (2)