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"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 24: Error Handling"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example tsignal.c, Page 634"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import signal\n",
"import sys\n",
"def handler(sig,frame):\n",
" print \"Handler called for signal\",sig\n",
"print \"Installing handler for signal\", signal.SIGINT\n",
"orig_handler=signal.signal(signal.SIGINT,handler)\n",
"print \"Changing handler to SIG_IGN\"\n",
"signal.signal(signal.SIGINT,signal.SIG_IGN)\n",
"print \"Restoring original handler\"\n",
"signal.signal(signal.SIGINT,orig_handler)\n",
"print \"Program terminates normally\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Installing handler for signal 2\n",
"Changing handler to SIG_IGN\n",
"Restoring original handler\n",
"Program terminates normally\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example tsetjmp.c, Page 636"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def main():\n",
" def f1():\n",
" print \"f1 begins\"\n",
" f2()\n",
" return\n",
" print \"f1 returns\"\n",
"\n",
" def f2():\n",
" print \"f2 begins\"\n",
" #longjmp(env, 1)\n",
" setjmp=1\n",
" print \"Program terminates: longjmp called\"\n",
" return\n",
" print \"f2 returns\"\n",
"\n",
" setjmp=0\n",
" if (setjmp == 0):\n",
" print \"setjmp returned 0\"\n",
" else:\n",
" print \"Program terminates: longjmp called\"\n",
" f1()\n",
" return\n",
" print \"Program terminates normally\"\n",
" \n",
"if __name__=='__main__':\n",
" main()\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"setjmp returned 0\n",
"f1 begins\n",
"f2 begins\n",
"Program terminates: longjmp called\n"
]
}
],
"prompt_number": 18
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
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"metadata": {}
}
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