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Trap (computing)
 
 
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In computing
Computing

Computing is usually defined as the activity of using and developing computer technology, computer hardware and computer software. It is the computer-specific part of information technology....
 and operating systems, a trap is a type of synchronous
Synchronization (computer science)

In computer science, synchronization refers to one of two distinct but related concepts: synchronization of process , and synchronization of data....
 interrupt
Interrupt

In computing, an interrupt is an asynchronous communication signal from hardware indicating the need for attention or a synchronous event in software indicating the need for a change in execution....
 typically caused by an exceptional
Exception handling

Exception handling is a programming language construct or computer hardware mechanism designed to handle the occurrence of exceptions - special conditions that change the normal flow of execution....
 condition (e.g. division by zero
Division by zero

In mathematics, a division is called a division by zero if the divisor is 0 . Such a division can be formally expressed as a/0 where a is the dividend....
 or invalid memory access
Segmentation fault

A segmentation fault is a particular error condition that can occur during the operation of computer software. A segmentation fault occurs when a program attempts to access a memory location that it is not allowed to access, or attempts to access a memory location in a way that is not allowed ....
) in a user process
Process (computing)

In computing, a process is an Object of a computer program that is being sequentially executed by a computer system that has the ability to run several computer programs Concurrency ....
. A trap usually results in a switch to kernel mode, wherein the operating system performs some action before returning control to the originating process. In some usages, the term trap refers specifically to an interrupt intended to initiate a context switch
Context switch

A context switch is the computing process of storing and restoring the State of a Central processing unit such that multiple Process es can share a single CPU resource....
 to a monitor program or debugger
Debugger

A debugger is a computer program that is used to test and debug other programs. The code to be examined might alternatively be running on an Instruction Set Simulator, a technique that allows great power in its ability to halt when specific conditions are encountered but which will typically be much slower than executing the code directly on...
.

In SNMP, a trap is a type of PDU
Protocol data unit

In telecommunications, the term protocol data unit has the following meanings:#Information that is delivered as a unit among peer entities of a computer network and that may contain control information, address information, or data....
 used to report an alert or other asynchronous event about a managed subsystem.








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In computing
Computing

Computing is usually defined as the activity of using and developing computer technology, computer hardware and computer software. It is the computer-specific part of information technology....
 and operating systems, a trap is a type of synchronous
Synchronization (computer science)

In computer science, synchronization refers to one of two distinct but related concepts: synchronization of process , and synchronization of data....
 interrupt
Interrupt

In computing, an interrupt is an asynchronous communication signal from hardware indicating the need for attention or a synchronous event in software indicating the need for a change in execution....
 typically caused by an exceptional
Exception handling

Exception handling is a programming language construct or computer hardware mechanism designed to handle the occurrence of exceptions - special conditions that change the normal flow of execution....
 condition (e.g. division by zero
Division by zero

In mathematics, a division is called a division by zero if the divisor is 0 . Such a division can be formally expressed as a/0 where a is the dividend....
 or invalid memory access
Segmentation fault

A segmentation fault is a particular error condition that can occur during the operation of computer software. A segmentation fault occurs when a program attempts to access a memory location that it is not allowed to access, or attempts to access a memory location in a way that is not allowed ....
) in a user process
Process (computing)

In computing, a process is an Object of a computer program that is being sequentially executed by a computer system that has the ability to run several computer programs Concurrency ....
. A trap usually results in a switch to kernel mode, wherein the operating system performs some action before returning control to the originating process. In some usages, the term trap refers specifically to an interrupt intended to initiate a context switch
Context switch

A context switch is the computing process of storing and restoring the State of a Central processing unit such that multiple Process es can share a single CPU resource....
 to a monitor program or debugger
Debugger

A debugger is a computer program that is used to test and debug other programs. The code to be examined might alternatively be running on an Instruction Set Simulator, a technique that allows great power in its ability to halt when specific conditions are encountered but which will typically be much slower than executing the code directly on...
.

In SNMP, a trap is a type of PDU
Protocol data unit

In telecommunications, the term protocol data unit has the following meanings:#Information that is delivered as a unit among peer entities of a computer network and that may contain control information, address information, or data....
 used to report an alert or other asynchronous event about a managed subsystem.

See also

  • System call
    System call

    In computing, a system call is the mechanism used by an application program to request service from the kernel based on the Monolithic_kernel or to system servers on operating systems based on the microkernel-structure....
  • Signal (computing)
    Signal (computing)

    A signal is a limited form of inter-process communication used in Unix, Unix-like, and other POSIX-compliant operating systems. Essentially it is an asynchronous notification sent to a Process in order to notify it of an event that occurred....
  • SIGTRAP
    SIGTRAP

    On POSIX-compliant platforms, SIGTRAP is the Signal thrown by computer programs when a condition arises that a debugger has requested to be informed of....
  • Stack trace
    Stack trace

    A stack trace is a report of the active stack frames instantiated by the execution of a program. It is commonly used to debug recursive subroutines: It keeps track of how the local variables in the subroutine changes on each invocation as well as the values that they return....