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In particular, the POSIX specification and the Linux man page signal (7) require that all system functions directly or indirectly called from a signal function are async-signal safe. [6] [7] The signal-safety(7) man page gives a list of such async-signal safe system functions (practically the system calls), otherwise it is an undefined behavior ...
In Unix and Unix-like operating systems, kill is a command used to send a signal to a process. By default, the message sent is the termination signal , which requests that the process exit . But kill is something of a misnomer; the signal sent may have nothing to do with process killing.
If the process receiving SIGHUP is a Unix shell, then as part of job control it will often intercept the signal and ensure that all stopped processes are continued before sending the signal to child processes (more precisely, process groups, represented internally by the shell as a "job"), which by default terminates them.
kill, which sends signals processes by process ID instead of by pattern-matching against the name. renice, which changes the priority of a process. top and htop, which display a list of processes and their resource usage; htop can send signals to processes directly from this list. skill, a command-line utility to send signals or report process ...
In Unix and Unix-like operating systems, job control refers to control of jobs by a shell, especially interactively, where a "job" is a shell's representation for a process group. Basic job control features are the suspending, resuming, or terminating of all processes in the job/process group; more advanced features can be performed by sending ...
ktrace – a BSD Unix and macOS utility that traces kernel–program interactions; ltrace – a Linux debugging utility, displays the calls a userland application makes to shared libraries; strace – a debugging utility for Linux, monitors system calls used by a program and all received signals
The distribution of signals to process groups forms the basis of job control employed by shell programs. The TTY device driver incorporates a notion of a foreground process group , to which it sends signals generated by keyboard interrupts , notably SIGINT ("interrupt", Control + C ), SIGTSTP ("terminal stop", Control + Z ), and SIGQUIT ("quit ...
For example, Linux systems using the grsecurity patch may log SIGSEGV signals in order to monitor for possible intrusion attempts using buffer overflows. On some systems, like Linux and Windows, it is possible for the program itself to handle a segmentation fault. [7]