examples/PIPS/posixsignals/asyncSignal/src/sigusr2.c

00001 /*
00002 Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
00003 
00004 Redistribution and use in source and binary forms, with or without
00005 modification, are permitted provided that the following conditions are met:
00006 
00007 * Redistributions of source code must retain the above copyright notice, this
00008   list of conditions and the following disclaimer.
00009 * Redistributions in binary form must reproduce the above copyright notice,
00010   this list of conditions and the following disclaimer in the documentation
00011   and/or other materials provided with the distribution.
00012 * Neither the name of Nokia Corporation nor the names of its contributors
00013   may be used to endorse or promote products derived from this software
00014   without specific prior written permission.
00015 
00016 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00017 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00018 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00019 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
00020 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00021 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
00022 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
00023 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00024 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00025 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00026 
00027 Description: The source file for sigusr2 process.
00028 */
00029 
00030 
00031 #include <stdio.h>
00032 #include <stdlib.h>
00033 #include <signal.h>
00034 #include <unistd.h>
00035 #include <e32def.h>
00036 
00040 int gVal = TRUE;
00041 
00046 void SIGUSR2_handler(int signum)
00047     {
00048     if(signum == SIGUSR2)
00049         {
00050         printf("Received the SIGUSR2 signal from the sigusr1 process after reading the file.\n");
00051         gVal = FALSE;
00052         }
00053     }
00054 
00062 int main(int argc,char **argv)
00063     {
00064     pid_t asyProcsID;
00065     char ch;
00066     int ret;
00067     if(argc < 2)
00068         {
00069         printf("Please pass the correct arguments\n");
00070         return EXIT_FAILURE;
00071         }
00072     asyProcsID = atoi(argv[1]);  //The variable holding the sigusr1 process PID.
00073     // Setup the custom handler for SIGUSR2.
00074     signal(SIGUSR2, SIGUSR2_handler);
00075     printf("******************** In the sigusr2 process ********************\n");
00076     
00077     printf("\nPress the Enter key to send the SIGUSR1 signal to the sigusr1 process\n");
00078     getchar();
00079     ret = kill(asyProcsID,SIGUSR1);
00080     if(ret)
00081         {
00082         printf("kill() failed to send signal, errno=%d\n",errno);
00083         gVal = FALSE;
00084         }
00085     
00086     /* 
00087      Waiting until a SIGUSR2 signal is obtained from the sigusr1 process.
00088      This signal is sent after the aynscFile.txt file has been
00089      read and its content written to the console.
00090     */
00091     while(gVal)
00092         {
00093         sleep(0);   //Initiates signal handling.
00094         }
00095     printf("\nPress 'e'+Enter to exit from the sigusr2 process\n");
00096     while((ch = getchar())!= 'e')
00097         {
00098         if(ch == '\n')
00099             continue;
00100         else
00101             printf("The wrong option was selected, please try again!!!\n");
00102         }
00103     return EXIT_SUCCESS;
00104     }

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