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author | Gregory Nutt <gnutt@nuttx.org> | 2015-04-09 10:16:35 -0600 |
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committer | Gregory Nutt <gnutt@nuttx.org> | 2015-04-09 10:16:35 -0600 |
commit | 27a18d9044ced6a33ab178848e6d37c95e86bcc4 (patch) | |
tree | f4b8c3a3aba0ec07f8824a7ed9ae71dd91c43280 /nuttx | |
parent | 546c308ae374a7a10c45c13965d30ceedbf6aa0a (diff) | |
download | px4-nuttx-27a18d9044ced6a33ab178848e6d37c95e86bcc4.tar.gz px4-nuttx-27a18d9044ced6a33ab178848e6d37c95e86bcc4.tar.bz2 px4-nuttx-27a18d9044ced6a33ab178848e6d37c95e86bcc4.zip |
Add sigset()
Diffstat (limited to 'nuttx')
-rw-r--r-- | nuttx/Documentation/NuttxUserGuide.html | 171 | ||||
-rw-r--r-- | nuttx/include/signal.h | 9 | ||||
-rw-r--r-- | nuttx/libc/signal/Make.defs | 1 | ||||
-rw-r--r-- | nuttx/libc/signal/sig_set.c | 127 |
4 files changed, 288 insertions, 20 deletions
diff --git a/nuttx/Documentation/NuttxUserGuide.html b/nuttx/Documentation/NuttxUserGuide.html index 917b52559..c2d65d00d 100644 --- a/nuttx/Documentation/NuttxUserGuide.html +++ b/nuttx/Documentation/NuttxUserGuide.html @@ -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> diff --git a/nuttx/include/signal.h b/nuttx/include/signal.h index 8dd86705a..59baf16a5 100644 --- a/nuttx/include/signal.h +++ b/nuttx/include/signal.h @@ -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); diff --git a/nuttx/libc/signal/Make.defs b/nuttx/libc/signal/Make.defs index b79cca478..7be0ba02e 100644 --- a/nuttx/libc/signal/Make.defs +++ b/nuttx/libc/signal/Make.defs @@ -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 diff --git a/nuttx/libc/signal/sig_set.c b/nuttx/libc/signal/sig_set.c new file mode 100644 index 000000000..c5f01f582 --- /dev/null +++ b/nuttx/libc/signal/sig_set.c @@ -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; +} |