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POsigprocmask( ) blocking signals in UNIX
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5288910
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AcceptedAnswerId
5288912
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2
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CreationDate
2011-03-13T10:51:51.763
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2011-03-13T11:58:27.463
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i have written a small piece of code. This code first blocks the {SIGSEGV}, then adds SIGRTMIN to the same set. So, my final signal set is, {SIGSEGV,SIGRTMIN}. Thus, if i use SIG_UNBLOCK, as per my understanding, first SIGRTMIN should be unblocked, and then again if i invoke SIG_UNBLOCK, SIGSEGV should be unblocked. That is, 1) {SIGSEGV,SIGRTMIN} 2) SIG_UNBLOCK = unblock SIGRTMIN, 3) Again invoke SIG_UNBLOCK = unblock SIGSEGV. I am giving the process a SIGRTMIN only, thus my second unblock should halt the process with SIGRTMIN. But it is not. Please help. N.B: Please don't give links to answers of other questions on sigprocmask( ), i have seen them and they don't clarify my question. <pre><code>enter code here #include <signal.h> #include <unistd.h> #include <stdio.h> int main() { sigset_t old_set,new_set; sigemptyset(&old_set); sigemptyset(&new_set); if(sigaddset(&old_set,SIGSEGV)==0) { printf("sigaddset successfully added for SIGSEGV\n"); } sigprocmask(SIG_BLOCK,&old_set,NULL); // SIGSEGV signal is masked kill(0,SIGSEGV); //***************************************************************** if(sigaddset(&new_set,SIGRTMIN)==0) { printf("sigaddset successfully added for SIGRTMIN\n"); } sigprocmask(SIG_BLOCK,&new_set,&old_set); // SIGRTMIN signal is masked kill(0,SIGSEGV); //****************** Unblock one signal at a time ****************** sigprocmask(SIG_UNBLOCK,&new_set,&old_set); // SIGRTMIN signal is unmasked sigprocmask(SIG_UNBLOCK,&new_set,&old_set); // SIGSEGV signal is unmasked </code></pre> } <pre><code>Output: [root@dhcppc0 signals]# ./a.out sigaddset successfully added for SIGSEGV sigaddset successfully added for SIGRTMIN (Note:SIGSEGV is not received even after sigprocmask(SIG_UNBLOCK,&new_set,&old_set); a second time) </code></pre>
Tags
<c><unix><signals><sigprocmask>
Title
sigprocmask( ) blocking signals in UNIX
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PostAcceptedAnswerId
1. PO
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UserOwnerUserId
1. USkingsmasher1
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1. PO
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2. PO
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