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    <p>Your premise is wrong. The whole set gets blocked and unblocked with a single call of <code>sigprocmask</code>. </p> <p>Also, normally you would create a set containing every signal you want to block, then you would attempt to block them all with <code>sigprocmask(SIG_BLOCK, pointer_to_sigset);</code>.</p> <p>Your code doesn't really unblock SIGSEGV though. Here's what i would write WITHOUT error handling, because it would make the snippet unnecessarily long. Check every function for errors though, the lists of possible errors are provided by man pages:</p> <pre><code>/* ... */ sigset_t signal_set; /* We don't need oldset in this program. You can add it, but it's best to use different sigsets for the second and third argument of sigprocmask. */ sigemptyset(&amp;signal_set); sigaddset(&amp;signal_set, SIGSEGV); sigaddset(&amp;signal_set, SIGRTMIN); /* now signal_set == {SIGSEGV, SIGRTMIN} */ sigprocmask(SIG_BLOCK, &amp;signal_set, NULL): /* As i said, we don't bother with the oldset argument. */ kill(0,SIGSEGV); kill(0,SIGSEGV); /* SIGSEGV is not a realtime signal, so we can send it twice, but it will be recieved just once */ sigprocmask(SIG_UNBLOCK, &amp;signal_set, NULL); /* Again, don't bother with oldset */ /* SIGSEGV will be received here */ </code></pre> <p>Of course, you might want to split blocking the signals into two operations on separate sets. The mechanism works like this: there is some set of blocked signals, which would replace oldset if you provided an oldset argument. You can add to that set with <code>SIG_BLOCK</code>, remove from that set with <code>SIG_UNBLOCK</code>, and change the whole set to your liking with <code>SIG_SETMASK</code> arguments of the <code>sigprocmask</code> function.</p>
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    1. CO@kubi: So why i am not receiving SIGSEGV?
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    2. CO@kubi: No, i don't think the whole set gets unblocked at one shot. Check the link: http://stackoverflow.com/questions/25261/help-with-sigprocmask. And moreover, sigprocmask( ) itself does not block or unblock, it is the argument or first parameter which makesit do block, unblock or mask. So, please think before pointing me wrong.
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    3. CO@kingsmasher1: How are you handling `SIGSEGV`? Could you paste a snippet of the signal handler code? Does the signal get sent correctly? Check the error codes of `sigprocmask` and `kill`.
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