mirror of https://github.com/mkerrisk/man-pages
92 lines
2.7 KiB
Groff
92 lines
2.7 KiB
Groff
'\" t
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.\" Copyright (c) 2007 by Michael Kerrisk <mtk.manpages@gmail.com>
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.TH SGETMASK 2 2014-12-31 "Linux" "Linux Programmer's Manual"
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.SH NAME
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sgetmask, ssetmask \- manipulation of signal mask (obsolete)
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.SH SYNOPSIS
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.B "long sgetmask(void);"
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.sp
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.BI "long ssetmask(long " newmask );
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.IR Note :
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There are no glibc wrappers for these system calls; see NOTES.
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.SH DESCRIPTION
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These system calls are obsolete.
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.IR "Do not use them" ;
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use
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.BR sigprocmask (2)
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instead.
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.BR sgetmask ()
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returns the signal mask of the calling process.
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.BR ssetmask ()
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sets the signal mask of the calling process to the value given in
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.IR newmask .
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The previous signal mask is returned.
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The signal masks dealt with by these two system calls
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are plain bit masks (unlike the
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.I sigset_t
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used by
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.BR sigprocmask (2));
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use
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.BR sigmask (3)
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to create and inspect these masks.
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.SH RETURN VALUE
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.BR sgetmask ()
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always successfully returns the signal mask.
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.BR ssetmask ()
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always succeeds, and returns the previous signal mask.
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.SH ERRORS
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These system calls always succeed.
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.SH VERSIONS
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Since Linux 3.16,
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.\" f6187769dae48234f3877df3c4d99294cc2254fa
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support for these system calls is optional,
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depending on whether the kernel was built with the
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.B CONFIG_SGETMASK_SYSCALL
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option.
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.SH CONFORMING TO
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These system calls are Linux-specific.
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.SH NOTES
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Glibc does not provide wrappers for these obsolete system calls;
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in the unlikely event that you want to call them, use
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.BR syscall (2).
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These system calls are unaware of signal numbers greater than 31
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(i.e., real-time signals).
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These system calls do not exist on x86-64.
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It is not possible to block
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.B SIGSTOP
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or
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.BR SIGKILL .
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.SH SEE ALSO
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.BR sigprocmask (2),
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.BR signal (7)
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