Add sigset()
This commit is contained in:
Gregory Nutt
parent
2aa80e06f5
commit
81703e6fad
4 changed files with 288 additions and 20 deletions
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@ -13,7 +13,7 @@
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<h1><big><font color="#3c34ec"><i>NuttX Operating System<p>User's Manual</i></font></big></h1>
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<p><small>by</small></p>
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<p>Gregory Nutt<p>
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<p>Last Updated: November 29, 2014</p>
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<p>Last Updated: April 9, 2015</p>
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</td>
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</tr>
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</table>
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@ -4487,14 +4487,19 @@ interface of the same name.
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<li><a href="#sigdelset">2.7.4 sigdelset</a></li>
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<li><a href="#sigismember">2.7.5 sigismember</a></li>
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<li><a href="#sigaction">2.7.6 sigaction</a></li>
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<li><a href="#sigprocmask">2.7.7 sigprocmask</a></li>
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<li><a href="#sigpending">2.7.8 sigpending</a></li>
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<li><a href="#sigsuspend">2.7.9 sigsuspend</a></li>
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<li><a href="#sigwaitinfo">2.7.10 sigwaitinfo</a></li>
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<li><a href="#sigtimedwait">2.7.11 sigtimedwait</a></li>
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<li><a href="#sigqueue">2.7.12 sigqueue</a></li>
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<li><a href="#kill">2.7.13 kill</a></li>
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<li><a href="#pause">2.7.14 pause</a></li>
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<li><a href="#sigignore">2.7.7 sigignore</a></li>
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<li><a href="#sigset">2.7.8 sigset</a></li>
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<li><a href="#sigprocmask">2.7.9 sigprocmask</a></li>
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<li><a href="#sighold">2.7.10 sighold</a></li>
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<li><a href="#sigrelse">2.7.11 sigrelse</a></li>
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<li><a href="#sigpending">2.7.12 sigpending</a></li>
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<li><a href="#sigsuspend">2.7.13 sigsuspend</a></li>
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<li><a href="#sigpause">2.7.14 sigpause</a></li>
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<li><a href="#sigwaitinfo">2.7.15 sigwaitinfo</a></li>
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<li><a href="#sigtimedwait">2.7.16 sigtimedwait</a></li>
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<li><a href="#sigqueue">2.7.17 sigqueue</a></li>
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<li><a href="#kill">2.7.18 kill</a></li>
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<li><a href="#pause">2.7.19 pause</a></li>
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</ul>
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<H3><a name="sigemptyset">2.7.1 sigemptyset</a></H3>
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@ -4729,7 +4734,65 @@ Differences from the POSIX implementation include:
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</li>
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</ul>
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<H3><a name="sigprocmask">2.7.7 sigprocmask</a></H3>
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<H3><a name="sigignore">2.7.7 sigignore</a></H3>
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<p>
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<b>Function Prototype:</b>
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<pre>
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#include <signal.h>
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int sigignore(int signo);
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</pre>
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<p>
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<b>Description:</b> The sigignore() function will set the disposition of <code>signo</code> to <code>SIG_IGN</code>.
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<p>
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<b>Input Parameters:</b>
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<ul>
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<li><code>signo</code>. The signal number to act on
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</ul>
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<p>
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<b>Returned Value:</b>
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<ul>
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<li>Zero is returned upon successful completion, otherwise -1 (<code>ERROR</code>) is returned with the <code<>errno</code> set appropriately. The <code>errno</code> value of <code>EINVAL</code>, for example, would indicate that <code>signo</code> argument is not a valid signal number.
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</ul>
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<H3><a name="sigset">2.7.8 sigset</a></H3>
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<p>
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<b>Function Prototype:</b>
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<pre>
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#include <signal.h>
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void (*sigset(int signo, void (*disp)(int)))(int);
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</pre>
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<p>
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<b>Description:</b>
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The sigset() function will modify signal dispositions.
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The <code>signo</code> argument specifies the signal.
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The <code>disp</code> argument specifies the signal's disposition, which may be <code>SIG_DFL</code>, <code>SIG_IGN</code>, or the address of a signal handler.
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If <code>disp</code> is the address of a signal handler, the system will add <code>signo</code> to the calling process' signal mask before executing the signal handler; when the signal handler returns, the system will restore the calling process' signal mask to its state prior to the delivery of the signal.
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<code>signo</code> will be removed from the calling process' signal mask.
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</p>
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<p>
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NOTE: The value <code>SIG_HOLD</code> for <code>disp</code> is not currently supported.
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</p>
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<p>
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<b>Input Parameters:</b>
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<ul>
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<li><code>signo</code>. The signal number to operate on
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<li><code>disp</code>. The new disposition of the signal
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</ul>
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<p>
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<b>Returned Value:</b>
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<ul>
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<li>
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Upon successful completion, <code>sigset()</code> will the previous disposition of the signal.
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Otherwise, <code>SIG_ERR</code> will be returned and <code>errno</code> set to indicate the error.
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</ul>
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<H3><a name="sigprocmask">2.7.9 sigprocmask</a></H3>
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<p>
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<b>Function Prototype:</b>
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@ -4779,7 +4842,55 @@ pointed to by the <code>set</code> input parameter.
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<b> POSIX Compatibility:</b> Comparable to the POSIX
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interface of the same name.
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<H3><a name="sigpending">2.7.8 sigpending</a></H3>
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<H3><a name="sighold">2.7.10 sighold</a></H3>
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<p>
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<b>Function Prototype:</b>
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<pre>
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#include <signal.h>
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int sighold(int signo);
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</pre>
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<p>
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<b>Description:</b> The sighold() function will add <code>signo</code> to the calling process' signal mask
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</p>
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<p>
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<b>Input Parameters:</b>
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<ul>
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<li><code>signo</code>. Identifies the signal to be blocked.
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</ul>
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<p>
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<b>Returned Value:</b>
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<ul>
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<li>Zero is returned upon successful completion, otherwise -1 (<code>ERROR</code>) is returned with the <code<>errno</code> set appropriately. The <code>errno</code> value of <code>EINVAL</code>, for example, would indicate that <code>signo</code> argument is not a valid signal number.
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</ul>
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<H3><a name="sigrelse">2.7.11 sigrelse</a></H3>
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<p>
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<b>Function Prototype:</b>
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<pre>
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#include <signal.h>
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int sigrelse(int signo);
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</pre>
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<p>
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<b>Description:</b> The sighold() function will remove <code>signo</code> from the calling process' signal mask
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</p>
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<p>
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<b>Input Parameters:</b>
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<ul>
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<li><code>signo</code>. Identifies the signal to be unblocked.
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</ul>
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<p>
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<b>Returned Value:</b>
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<ul>
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<li>Zero is returned upon successful completion, otherwise -1 (<code>ERROR</code>) is returned with the <code<>errno</code> set appropriately. The <code>errno</code> value of <code>EINVAL</code>, for example, would indicate that <code>signo</code> argument is not a valid signal number.
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</ul>
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<H3><a name="sigpending">2.7.12 sigpending</a></H3>
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<p>
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<b>Function Prototype:</b>
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@ -4817,7 +4928,7 @@ is delivered more than once."
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<b> POSIX Compatibility:</b> Comparable to the POSIX
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interface of the same name.
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<H3><a name="sigsuspend">2.7.9 sigsuspend</a></H3>
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<H3><a name="sigsuspend">2.7.13 sigsuspend</a></H3>
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<p>
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<b>Function Prototype:</b>
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@ -4865,7 +4976,30 @@ function or to terminate the task." Only delivery of the signal
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is required in the present implementation (even if the signal is ignored).
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</ul>
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<H3><a name="sigwaitinfo">2.7.10 sigwaitinfo</a></H3>
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<H3><a name="sigpause">2.7.14 sigpause</a></H3>
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<p>
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<b>Function Prototype:</b>
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<pre>
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#include <signal.h>
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int sigpause(int signo);
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</pre>
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<p>
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<b>Description:</b> The <code>sigpause()</code>) function will remove <code>signo</code>) from the calling process' signal mask and suspend the calling process until a signal is received.
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The <code>sigpause()</code>) function will restore the process' signal mask to its original state before returning.
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<p>
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<b>Input Parameters:</b>
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<ul>
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<li><code>set</code>. Identifies the signal to be unblocked while waiting.
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</ul>
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<p>
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<b>Returned Value:</b>
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<ul>
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<li><code>sigpause</code> always returns -1 (<code>ERROR</code>). On a successful wait for a signal, the <code>errno</code> will be set to <code>EINTR</code>.
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</ul>
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<H3><a name="sigwaitinfo">2.7.15 sigwaitinfo</a></H3>
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<p>
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<b>Function Prototype:</b>
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@ -4894,10 +5028,9 @@ with a NULL timeout parameter. (see below).
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<p>
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<b>Assumptions/Limitations:</b>
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<p>
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<b> POSIX Compatibility:</b> Comparable to the POSIX
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interface of the same name.
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<b> POSIX Compatibility:</b> Comparable to the POSIX interface of the same name.
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<H3><a name="sigtimedwait">2.7.11 sigtimedwait</a></H3>
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<H3><a name="sigtimedwait">2.7.16 sigtimedwait</a></H3>
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<p>
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<b>Function Prototype:</b>
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@ -4963,7 +5096,7 @@ that the unblocked signal be caught; the task will be resumed even if
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the unblocked signal is ignored.
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</ul>
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<H3><a name="sigqueue">2.7.12 sigqueue</a></H3>
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<H3><a name="sigqueue">2.7.17 sigqueue</a></H3>
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<p>
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<b>Function Prototype:</b>
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@ -5020,7 +5153,7 @@ There is no null signal in the present implementation; a zero signal will
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be sent.
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</ul>
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<H3><a name="kill">2.7.13 kill</a></H3>
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<H3><a name="kill">2.7.18 kill</a></H3>
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<p>
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<b>Function Prototype:</b>
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@ -5076,7 +5209,7 @@ be sent.
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<li>Sending of signals to 'process groups' is not supported in NuttX.</li>
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</ul>
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<H3><a name="pause">2.7.14 pause</a></H3>
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<H3><a name="pause">2.7.19 pause</a></H3>
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<p>
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<b>Function Prototype:</b>
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@ -165,11 +165,17 @@
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#define SIGEV_NONE 0 /* No notification desired */
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#define SIGEV_SIGNAL 1 /* Notify via signal */
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/* Special values of sigaction (all treated like NULL) */
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/* Special values of of sa_handler used by sigaction and sigset. There are all
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* treated like NULL for now.
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*
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* REVISIT: Need to distinguish the value of SIG_HOLD. It is need in the
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* implementation of sigset().
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*/
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#define SIG_ERR ((CODE void*)-1)
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#define SIG_DFL ((CODE void*)0)
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#define SIG_IGN ((CODE void*)0)
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#define SIG_HOLD ((CODE void*)0)
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/********************************************************************************
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* Global Type Declarations
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@ -262,6 +268,7 @@ int sigdelset(FAR sigset_t *set, int signo);
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int sigismember(FAR const sigset_t *set, int signo);
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int sigaction(int sig, FAR const struct sigaction *act,
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FAR struct sigaction *oact);
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void (*sigset(int signo, void (*disp)(int)))(int);
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int sigignore(int signo);
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int sigprocmask(int how, FAR const sigset_t *set, FAR sigset_t *oset);
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int sigpause(int signo);
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@ -39,6 +39,7 @@ ifneq ($(CONFIG_DISABLE_SIGNALS),y)
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CSRCS += sig_emptyset.c sig_fillset.c sig_addset.c sig_delset.c
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CSRCS += sig_ismember.c sig_hold.c sig_relse.c sig_ignore.c sig_pause.c
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CSRCS += sig_set.c
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# Add the signal directory to the build
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127
libc/signal/sig_set.c
Normal file
127
libc/signal/sig_set.c
Normal file
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@ -0,0 +1,127 @@
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/****************************************************************************
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* libc/signal/sig_set.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <signal.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sigset
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*
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* Description:
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* The sigset() function will modify signal dispositions. The 'signo'
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* argument specifies the signal. The 'disp' argument specifies the
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* signal's disposition, which may be SIG_DFL, SIG_IGN, or the address
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* of a signal handler. If 'disp' is the address of a signal handler, the
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* system will add 'signo' to the calling process' signal mask before
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* executing the signal handler; when the signal handler returns, the
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* system will restore the calling process' signal mask to its state prior
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* to the delivery of the signal. 'signo' will be removed from the calling
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* process' signal mask.
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*
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* NOTE: The value SIG_HOLD for 'disp' is not supported. It should work
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* like this: If 'disp' is equal to SIG_HOLD, 'signo' will be added to,
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* not removed from, the calling process' signal mask and 'signo''s
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* disposition will remain unchanged.
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*
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* Input Parameters:
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* signo - Identifies the signal to operate on
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* disp - The new disposition of the signal
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*
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* Returned Value:
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* Upon successful completion, sigset() will the previous disposition of
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* the signal. Otherwise, SIG_ERR will be returned and errno set to
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* indicate the error.
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*
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* NOTE: sigset() would return SIG_HOLD if the signal had been blocked and
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* the signal's previous disposition if it had not been blocked.
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*
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****************************************************************************/
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void (*sigset(int signo, void (*disp)(int)))(int)
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{
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struct sigaction act;
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struct sigaction oact;
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int ret;
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/* Initialize the sigaction structure */
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act.sa_handler = disp;
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act.sa_flags = 0;
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(void)sigemptyset(&act.sa_mask);
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/* Check for SIG_IGN and SIG_DFL (and someday SIG_HOLD)
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*
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* REVISIT: Currently SIG_IGN, SIG_DFL, and SIG_HOLD have the same value
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* and cannot be distinguished.
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*/
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if (disp != SIG_DFL /* && disp != SIG_IGN */)
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{
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/* Add the signal to the set of signals to be ignored with the signal
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* handler executes.
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*/
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ret = sigaddset(&act.sa_mask, signo);
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if (ret < 0)
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{
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/* Would happen if signo were invalid */
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return SIG_ERR;
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}
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}
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/* Set the signal disposition */
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ret = sigaction(signo, &act, &oact);
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/* Upon successful completion, sigset() will the signal's previous
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* disposition. Otherwise, SIG_ERR will be returned and errno set to
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* indicate the error.
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*/
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if (ret == OK)
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{
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return oact.sa_handler;
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}
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return SIG_ERR;
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}
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