mirror of
https://github.com/apache/nuttx.git
synced 2025-01-13 08:38:38 +08:00
Add sigset()
This commit is contained in:
Gregory Nutt
parent
2aa80e06f5
commit
81703e6fad
4 changed files with 288 additions and 20 deletions
|
|
@ -13,7 +13,7 @@
|
|||
<h1><big><font color="#3c34ec"><i>NuttX Operating System<p>User's Manual</i></font></big></h1>
|
||||
<p><small>by</small></p>
|
||||
<p>Gregory Nutt<p>
|
||||
<p>Last Updated: November 29, 2014</p>
|
||||
<p>Last Updated: April 9, 2015</p>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
|
@ -4487,14 +4487,19 @@ interface of the same name.
|
|||
<li><a href="#sigdelset">2.7.4 sigdelset</a></li>
|
||||
<li><a href="#sigismember">2.7.5 sigismember</a></li>
|
||||
<li><a href="#sigaction">2.7.6 sigaction</a></li>
|
||||
<li><a href="#sigprocmask">2.7.7 sigprocmask</a></li>
|
||||
<li><a href="#sigpending">2.7.8 sigpending</a></li>
|
||||
<li><a href="#sigsuspend">2.7.9 sigsuspend</a></li>
|
||||
<li><a href="#sigwaitinfo">2.7.10 sigwaitinfo</a></li>
|
||||
<li><a href="#sigtimedwait">2.7.11 sigtimedwait</a></li>
|
||||
<li><a href="#sigqueue">2.7.12 sigqueue</a></li>
|
||||
<li><a href="#kill">2.7.13 kill</a></li>
|
||||
<li><a href="#pause">2.7.14 pause</a></li>
|
||||
<li><a href="#sigignore">2.7.7 sigignore</a></li>
|
||||
<li><a href="#sigset">2.7.8 sigset</a></li>
|
||||
<li><a href="#sigprocmask">2.7.9 sigprocmask</a></li>
|
||||
<li><a href="#sighold">2.7.10 sighold</a></li>
|
||||
<li><a href="#sigrelse">2.7.11 sigrelse</a></li>
|
||||
<li><a href="#sigpending">2.7.12 sigpending</a></li>
|
||||
<li><a href="#sigsuspend">2.7.13 sigsuspend</a></li>
|
||||
<li><a href="#sigpause">2.7.14 sigpause</a></li>
|
||||
<li><a href="#sigwaitinfo">2.7.15 sigwaitinfo</a></li>
|
||||
<li><a href="#sigtimedwait">2.7.16 sigtimedwait</a></li>
|
||||
<li><a href="#sigqueue">2.7.17 sigqueue</a></li>
|
||||
<li><a href="#kill">2.7.18 kill</a></li>
|
||||
<li><a href="#pause">2.7.19 pause</a></li>
|
||||
</ul>
|
||||
|
||||
<H3><a name="sigemptyset">2.7.1 sigemptyset</a></H3>
|
||||
|
|
@ -4729,7 +4734,65 @@ Differences from the POSIX implementation include:
|
|||
</li>
|
||||
</ul>
|
||||
|
||||
<H3><a name="sigprocmask">2.7.7 sigprocmask</a></H3>
|
||||
<H3><a name="sigignore">2.7.7 sigignore</a></H3>
|
||||
|
||||
<p>
|
||||
<b>Function Prototype:</b>
|
||||
<pre>
|
||||
#include <signal.h>
|
||||
int sigignore(int signo);
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
<b>Description:</b> The sigignore() function will set the disposition of <code>signo</code> to <code>SIG_IGN</code>.
|
||||
<p>
|
||||
<b>Input Parameters:</b>
|
||||
<ul>
|
||||
<li><code>signo</code>. The signal number to act on
|
||||
</ul>
|
||||
|
||||
<p>
|
||||
<b>Returned Value:</b>
|
||||
<ul>
|
||||
<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.
|
||||
</ul>
|
||||
|
||||
<H3><a name="sigset">2.7.8 sigset</a></H3>
|
||||
|
||||
<p>
|
||||
<b>Function Prototype:</b>
|
||||
<pre>
|
||||
#include <signal.h>
|
||||
void (*sigset(int signo, void (*disp)(int)))(int);
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
<b>Description:</b>
|
||||
The sigset() function will modify signal dispositions.
|
||||
The <code>signo</code> argument specifies the signal.
|
||||
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.
|
||||
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.
|
||||
<code>signo</code> will be removed from the calling process' signal mask.
|
||||
</p>
|
||||
<p>
|
||||
NOTE: The value <code>SIG_HOLD</code> for <code>disp</code> is not currently supported.
|
||||
</p>
|
||||
<p>
|
||||
<b>Input Parameters:</b>
|
||||
<ul>
|
||||
<li><code>signo</code>. The signal number to operate on
|
||||
<li><code>disp</code>. The new disposition of the signal
|
||||
</ul>
|
||||
|
||||
<p>
|
||||
<b>Returned Value:</b>
|
||||
<ul>
|
||||
<li>
|
||||
Upon successful completion, <code>sigset()</code> will the previous disposition of the signal.
|
||||
Otherwise, <code>SIG_ERR</code> will be returned and <code>errno</code> set to indicate the error.
|
||||
</ul>
|
||||
|
||||
<H3><a name="sigprocmask">2.7.9 sigprocmask</a></H3>
|
||||
|
||||
<p>
|
||||
<b>Function Prototype:</b>
|
||||
|
|
@ -4779,7 +4842,55 @@ pointed to by the <code>set</code> input parameter.
|
|||
<b> POSIX Compatibility:</b> Comparable to the POSIX
|
||||
interface of the same name.
|
||||
|
||||
<H3><a name="sigpending">2.7.8 sigpending</a></H3>
|
||||
<H3><a name="sighold">2.7.10 sighold</a></H3>
|
||||
|
||||
<p>
|
||||
<b>Function Prototype:</b>
|
||||
<pre>
|
||||
#include <signal.h>
|
||||
int sighold(int signo);
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
<b>Description:</b> The sighold() function will add <code>signo</code> to the calling process' signal mask
|
||||
</p>
|
||||
<p>
|
||||
<b>Input Parameters:</b>
|
||||
<ul>
|
||||
<li><code>signo</code>. Identifies the signal to be blocked.
|
||||
</ul>
|
||||
|
||||
<p>
|
||||
<b>Returned Value:</b>
|
||||
<ul>
|
||||
<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.
|
||||
</ul>
|
||||
|
||||
<H3><a name="sigrelse">2.7.11 sigrelse</a></H3>
|
||||
|
||||
<p>
|
||||
<b>Function Prototype:</b>
|
||||
<pre>
|
||||
#include <signal.h>
|
||||
int sigrelse(int signo);
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
<b>Description:</b> The sighold() function will remove <code>signo</code> from the calling process' signal mask
|
||||
</p>
|
||||
<p>
|
||||
<b>Input Parameters:</b>
|
||||
<ul>
|
||||
<li><code>signo</code>. Identifies the signal to be unblocked.
|
||||
</ul>
|
||||
|
||||
<p>
|
||||
<b>Returned Value:</b>
|
||||
<ul>
|
||||
<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.
|
||||
</ul>
|
||||
|
||||
<H3><a name="sigpending">2.7.12 sigpending</a></H3>
|
||||
|
||||
<p>
|
||||
<b>Function Prototype:</b>
|
||||
|
|
@ -4817,7 +4928,7 @@ is delivered more than once."
|
|||
<b> POSIX Compatibility:</b> Comparable to the POSIX
|
||||
interface of the same name.
|
||||
|
||||
<H3><a name="sigsuspend">2.7.9 sigsuspend</a></H3>
|
||||
<H3><a name="sigsuspend">2.7.13 sigsuspend</a></H3>
|
||||
|
||||
<p>
|
||||
<b>Function Prototype:</b>
|
||||
|
|
@ -4865,7 +4976,30 @@ function or to terminate the task." Only delivery of the signal
|
|||
is required in the present implementation (even if the signal is ignored).
|
||||
</ul>
|
||||
|
||||
<H3><a name="sigwaitinfo">2.7.10 sigwaitinfo</a></H3>
|
||||
<H3><a name="sigpause">2.7.14 sigpause</a></H3>
|
||||
<p>
|
||||
<b>Function Prototype:</b>
|
||||
<pre>
|
||||
#include <signal.h>
|
||||
int sigpause(int signo);
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
<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.
|
||||
The <code>sigpause()</code>) function will restore the process' signal mask to its original state before returning.
|
||||
<p>
|
||||
<b>Input Parameters:</b>
|
||||
<ul>
|
||||
<li><code>set</code>. Identifies the signal to be unblocked while waiting.
|
||||
</ul>
|
||||
|
||||
<p>
|
||||
<b>Returned Value:</b>
|
||||
<ul>
|
||||
<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>.
|
||||
</ul>
|
||||
|
||||
<H3><a name="sigwaitinfo">2.7.15 sigwaitinfo</a></H3>
|
||||
|
||||
<p>
|
||||
<b>Function Prototype:</b>
|
||||
|
|
@ -4894,10 +5028,9 @@ with a NULL timeout parameter. (see below).
|
|||
<p>
|
||||
<b>Assumptions/Limitations:</b>
|
||||
<p>
|
||||
<b> POSIX Compatibility:</b> Comparable to the POSIX
|
||||
interface of the same name.
|
||||
<b> POSIX Compatibility:</b> Comparable to the POSIX interface of the same name.
|
||||
|
||||
<H3><a name="sigtimedwait">2.7.11 sigtimedwait</a></H3>
|
||||
<H3><a name="sigtimedwait">2.7.16 sigtimedwait</a></H3>
|
||||
|
||||
<p>
|
||||
<b>Function Prototype:</b>
|
||||
|
|
@ -4963,7 +5096,7 @@ that the unblocked signal be caught; the task will be resumed even if
|
|||
the unblocked signal is ignored.
|
||||
</ul>
|
||||
|
||||
<H3><a name="sigqueue">2.7.12 sigqueue</a></H3>
|
||||
<H3><a name="sigqueue">2.7.17 sigqueue</a></H3>
|
||||
|
||||
<p>
|
||||
<b>Function Prototype:</b>
|
||||
|
|
@ -5020,7 +5153,7 @@ There is no null signal in the present implementation; a zero signal will
|
|||
be sent.
|
||||
</ul>
|
||||
|
||||
<H3><a name="kill">2.7.13 kill</a></H3>
|
||||
<H3><a name="kill">2.7.18 kill</a></H3>
|
||||
|
||||
<p>
|
||||
<b>Function Prototype:</b>
|
||||
|
|
@ -5076,7 +5209,7 @@ be sent.
|
|||
<li>Sending of signals to 'process groups' is not supported in NuttX.</li>
|
||||
</ul>
|
||||
|
||||
<H3><a name="pause">2.7.14 pause</a></H3>
|
||||
<H3><a name="pause">2.7.19 pause</a></H3>
|
||||
|
||||
<p>
|
||||
<b>Function Prototype:</b>
|
||||
|
|
|
|||
|
|
@ -165,11 +165,17 @@
|
|||
#define SIGEV_NONE 0 /* No notification desired */
|
||||
#define SIGEV_SIGNAL 1 /* Notify via signal */
|
||||
|
||||
/* Special values of sigaction (all treated like NULL) */
|
||||
/* Special values of of sa_handler used by sigaction and sigset. There are all
|
||||
* treated like NULL for now.
|
||||
*
|
||||
* REVISIT: Need to distinguish the value of SIG_HOLD. It is need in the
|
||||
* implementation of sigset().
|
||||
*/
|
||||
|
||||
#define SIG_ERR ((CODE void*)-1)
|
||||
#define SIG_DFL ((CODE void*)0)
|
||||
#define SIG_IGN ((CODE void*)0)
|
||||
#define SIG_HOLD ((CODE void*)0)
|
||||
|
||||
/********************************************************************************
|
||||
* Global Type Declarations
|
||||
|
|
@ -262,6 +268,7 @@ int sigdelset(FAR sigset_t *set, int signo);
|
|||
int sigismember(FAR const sigset_t *set, int signo);
|
||||
int sigaction(int sig, FAR const struct sigaction *act,
|
||||
FAR struct sigaction *oact);
|
||||
void (*sigset(int signo, void (*disp)(int)))(int);
|
||||
int sigignore(int signo);
|
||||
int sigprocmask(int how, FAR const sigset_t *set, FAR sigset_t *oset);
|
||||
int sigpause(int signo);
|
||||
|
|
|
|||
|
|
@ -39,6 +39,7 @@ ifneq ($(CONFIG_DISABLE_SIGNALS),y)
|
|||
|
||||
CSRCS += sig_emptyset.c sig_fillset.c sig_addset.c sig_delset.c
|
||||
CSRCS += sig_ismember.c sig_hold.c sig_relse.c sig_ignore.c sig_pause.c
|
||||
CSRCS += sig_set.c
|
||||
|
||||
# Add the signal directory to the build
|
||||
|
||||
|
|
|
|||
127
libc/signal/sig_set.c
Normal file
127
libc/signal/sig_set.c
Normal file
|
|
@ -0,0 +1,127 @@
|
|||
/****************************************************************************
|
||||
* libc/signal/sig_set.c
|
||||
*
|
||||
* Copyright (C) 2015 Gregory Nutt. All rights reserved.
|
||||
* Author: Gregory Nutt <gnutt@nuttx.org>
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Included Files
|
||||
****************************************************************************/
|
||||
|
||||
#include <signal.h>
|
||||
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: sigset
|
||||
*
|
||||
* Description:
|
||||
* The sigset() function will modify signal dispositions. The 'signo'
|
||||
* argument specifies the signal. The 'disp' argument specifies the
|
||||
* signal's disposition, which may be SIG_DFL, SIG_IGN, or the address
|
||||
* of a signal handler. If 'disp' is the address of a signal handler, the
|
||||
* system will add 'signo' 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. 'signo' will be removed from the calling
|
||||
* process' signal mask.
|
||||
*
|
||||
* NOTE: The value SIG_HOLD for 'disp' is not supported. It should work
|
||||
* like this: If 'disp' is equal to SIG_HOLD, 'signo' will be added to,
|
||||
* not removed from, the calling process' signal mask and 'signo''s
|
||||
* disposition will remain unchanged.
|
||||
*
|
||||
* Input Parameters:
|
||||
* signo - Identifies the signal to operate on
|
||||
* disp - The new disposition of the signal
|
||||
*
|
||||
* Returned Value:
|
||||
* Upon successful completion, sigset() will the previous disposition of
|
||||
* the signal. Otherwise, SIG_ERR will be returned and errno set to
|
||||
* indicate the error.
|
||||
*
|
||||
* NOTE: sigset() would return SIG_HOLD if the signal had been blocked and
|
||||
* the signal's previous disposition if it had not been blocked.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void (*sigset(int signo, void (*disp)(int)))(int)
|
||||
{
|
||||
struct sigaction act;
|
||||
struct sigaction oact;
|
||||
int ret;
|
||||
|
||||
/* Initialize the sigaction structure */
|
||||
|
||||
act.sa_handler = disp;
|
||||
act.sa_flags = 0;
|
||||
(void)sigemptyset(&act.sa_mask);
|
||||
|
||||
/* Check for SIG_IGN and SIG_DFL (and someday SIG_HOLD)
|
||||
*
|
||||
* REVISIT: Currently SIG_IGN, SIG_DFL, and SIG_HOLD have the same value
|
||||
* and cannot be distinguished.
|
||||
*/
|
||||
|
||||
if (disp != SIG_DFL /* && disp != SIG_IGN */)
|
||||
{
|
||||
/* Add the signal to the set of signals to be ignored with the signal
|
||||
* handler executes.
|
||||
*/
|
||||
|
||||
ret = sigaddset(&act.sa_mask, signo);
|
||||
if (ret < 0)
|
||||
{
|
||||
/* Would happen if signo were invalid */
|
||||
|
||||
return SIG_ERR;
|
||||
}
|
||||
}
|
||||
|
||||
/* Set the signal disposition */
|
||||
|
||||
ret = sigaction(signo, &act, &oact);
|
||||
|
||||
/* Upon successful completion, sigset() will the signal's previous
|
||||
* disposition. Otherwise, SIG_ERR will be returned and errno set to
|
||||
* indicate the error.
|
||||
*/
|
||||
|
||||
if (ret == OK)
|
||||
{
|
||||
return oact.sa_handler;
|
||||
}
|
||||
|
||||
return SIG_ERR;
|
||||
}
|
||||
Loading…
Reference in a new issue