325 lines
7.2 KiB
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325 lines
7.2 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of RT_SIGQUEUEINFO</TITLE>
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</HEAD><BODY>
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<H1>RT_SIGQUEUEINFO</H1>
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Section: Linux Programmer's Manual (2)<BR>Updated: 2019-10-10<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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rt_sigqueueinfo, rt_tgsigqueueinfo - queue a signal and data
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>int rt_sigqueueinfo(pid_t </B><I>tgid</I><B>, int </B><I>sig</I><B>, siginfo_t *</B><I>info</I><B>);</B>
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<B>int rt_tgsigqueueinfo(pid_t </B><I>tgid</I><B>, pid_t </B><I>tid</I><B>, int </B><I>sig</I><B>,</B>
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<B> siginfo_t *</B><I>info</I><B>);</B>
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</PRE>
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<P>
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<I>Note</I>:
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There are no glibc wrappers for these system calls; see NOTES.
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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The
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<B>rt_sigqueueinfo</B>()
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and
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<B>rt_tgsigqueueinfo</B>()
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system calls are the low-level interfaces used to send a signal plus data
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to a process or thread.
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The receiver of the signal can obtain the accompanying data
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by establishing a signal handler with the
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<B><A HREF="/cgi-bin/man/man2html?2+sigaction">sigaction</A></B>(2)
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<B>SA_SIGINFO</B>
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flag.
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<P>
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These system calls are not intended for direct application use;
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they are provided to allow the implementation of
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<B><A HREF="/cgi-bin/man/man2html?3+sigqueue">sigqueue</A></B>(3)
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and
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_sigqueue">pthread_sigqueue</A></B>(3).
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<P>
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The
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<B>rt_sigqueueinfo</B>()
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system call sends the signal
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<I>sig</I>
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to the thread group with the ID
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<I>tgid</I>.
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(The term "thread group" is synonymous with "process", and
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<I>tid</I>
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corresponds to the traditional UNIX process ID.)
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The signal will be delivered to an arbitrary member of the thread group
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(i.e., one of the threads that is not currently blocking the signal).
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<P>
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The
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<I>info</I>
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argument specifies the data to accompany the signal.
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This argument is a pointer to a structure of type
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<I>siginfo_t</I>,
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described in
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<B><A HREF="/cgi-bin/man/man2html?2+sigaction">sigaction</A></B>(2)
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(and defined by including
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<I><<A HREF="file:///usr/include/sigaction.h">sigaction.h</A>></I>).
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The caller should set the following fields in this structure:
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<DL COMPACT>
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<DT id="1"><I>si_code</I>
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<DD>
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This should be one of the
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<B>SI_*</B>
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codes in the Linux kernel source file
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<I>include/asm-generic/siginfo.h</I>.
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If the signal is being sent to any process other than the caller itself,
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the following restrictions apply:
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<DL COMPACT><DT id="2"><DD>
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<DL COMPACT>
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<DT id="3">*<DD>
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The code can't be a value greater than or equal to zero.
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In particular, it can't be
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<B>SI_USER</B>,
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which is used by the kernel to indicate a signal sent by
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<B><A HREF="/cgi-bin/man/man2html?2+kill">kill</A></B>(2),
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and nor can it be
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<B>SI_KERNEL</B>,
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which is used to indicate a signal generated by the kernel.
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<DT id="4">*<DD>
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The code can't (since Linux 2.6.39) be
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<B>SI_TKILL</B>,
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which is used by the kernel to indicate a signal sent using
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<B><A HREF="/cgi-bin/man/man2html?2+tgkill">tgkill</A></B>(2).
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</DL>
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</DL>
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<DT id="5"><I>si_pid</I>
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<DD>
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This should be set to a process ID,
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typically the process ID of the sender.
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<DT id="6"><I>si_uid</I>
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<DD>
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This should be set to a user ID,
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typically the real user ID of the sender.
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<DT id="7"><I>si_value</I>
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<DD>
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This field contains the user data to accompany the signal.
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For more information, see the description of the last
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(<I>union sigval</I>)
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argument of
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<B><A HREF="/cgi-bin/man/man2html?3+sigqueue">sigqueue</A></B>(3).
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</DL>
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<P>
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Internally, the kernel sets the
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<I>si_signo</I>
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field to the value specified in
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<I>sig</I>,
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so that the receiver of the signal can also obtain
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the signal number via that field.
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<P>
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The
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<B>rt_tgsigqueueinfo</B>()
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system call is like
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<B>rt_sigqueueinfo</B>(),
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but sends the signal and data to the single thread
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specified by the combination of
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<I>tgid</I>,
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a thread group ID,
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and
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<I>tid</I>,
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a thread in that thread group.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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On success, these system calls return 0.
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On error, they return -1 and
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<I>errno</I>
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is set to indicate the error.
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<A NAME="lbAF"> </A>
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<H2>ERRORS</H2>
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<DL COMPACT>
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<DT id="8"><B>EAGAIN</B>
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<DD>
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The limit of signals which may be queued has been reached.
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(See
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<B><A HREF="/cgi-bin/man/man2html?7+signal">signal</A></B>(7)
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for further information.)
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<DT id="9"><B>EINVAL</B>
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<DD>
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<I>sig</I>,
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<I>tgid</I>,
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or
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<I>tid</I>
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was invalid.
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<DT id="10"><B>EPERM</B>
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<DD>
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The caller does not have permission to send the signal to the target.
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For the required permissions, see
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<B><A HREF="/cgi-bin/man/man2html?2+kill">kill</A></B>(2).
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<DT id="11"><B>EPERM</B>
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<DD>
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<I>tgid</I>
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specifies a process other than the caller and
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<I>info->si_code</I>
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is invalid.
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<DT id="12"><B>ESRCH</B>
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<DD>
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<B>rt_sigqueueinfo</B>():
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No thread group matching
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<I>tgid</I>
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was found.
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</DL>
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<P>
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<B>rt_tgsigqueinfo</B>():
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No thread matching
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<I>tgid</I>
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and
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<I>tid</I>
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was found.
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<A NAME="lbAG"> </A>
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<H2>VERSIONS</H2>
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The
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<B>rt_sigqueueinfo</B>()
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system call was added to Linux in version 2.2.
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The
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<B>rt_tgsigqueueinfo</B>()
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system call was added to Linux in version 2.6.31.
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<A NAME="lbAH"> </A>
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<H2>CONFORMING TO</H2>
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These system calls are Linux-specific.
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<A NAME="lbAI"> </A>
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<H2>NOTES</H2>
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Since these system calls are not intended for application use,
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there are no glibc wrapper functions; use
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<B><A HREF="/cgi-bin/man/man2html?2+syscall">syscall</A></B>(2)
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in the unlikely case that you want to call them directly.
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<P>
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As with
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<B><A HREF="/cgi-bin/man/man2html?2+kill">kill</A></B>(2),
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the null signal (0) can be used to check if the specified process
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or thread exists.
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<A NAME="lbAJ"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?2+kill">kill</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+pidfd_send_signal">pidfd_send_signal</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+sigaction">sigaction</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+sigprocmask">sigprocmask</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+tgkill">tgkill</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_sigqueue">pthread_sigqueue</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+sigqueue">sigqueue</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?7+signal">signal</A></B>(7)
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<A NAME="lbAK"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="13"><A HREF="#lbAB">NAME</A><DD>
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<DT id="14"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="15"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="16"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="17"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="18"><A HREF="#lbAG">VERSIONS</A><DD>
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<DT id="19"><A HREF="#lbAH">CONFORMING TO</A><DD>
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<DT id="20"><A HREF="#lbAI">NOTES</A><DD>
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<DT id="21"><A HREF="#lbAJ">SEE ALSO</A><DD>
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<DT id="22"><A HREF="#lbAK">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:34 GMT, March 31, 2021
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</BODY>
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</HTML>
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