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'\" et
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.TH SIGDELSET "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.SH PROLOG
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This manual page is part of the POSIX Programmer's Manual.
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The Linux implementation of this interface may differ (consult
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the corresponding Linux manual page for details of Linux behavior),
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or the interface may not be implemented on Linux.
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.SH NAME
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sigdelset
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\(em delete a signal from a signal set
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.SH SYNOPSIS
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.LP
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.nf
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#include <signal.h>
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.P
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int sigdelset(sigset_t *\fIset\fP, int \fIsigno\fP);
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.fi
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.SH DESCRIPTION
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The
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\fIsigdelset\fR()
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function deletes the individual signal specified by
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.IR signo
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from the signal set pointed to by
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.IR set .
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.P
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Applications should call either
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\fIsigemptyset\fR()
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or
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\fIsigfillset\fR()
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at least once for each object of type
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.BR sigset_t
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prior to any other use of that object. If such an object is not
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initialized in this way, but is nonetheless supplied as an argument to
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any of
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\fIpthread_sigmask\fR(),
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\fIsigaction\fR(),
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\fIsigaddset\fR(),
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\fIsigdelset\fR(),
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\fIsigismember\fR(),
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\fIsigpending\fR(),
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\fIsigprocmask\fR(),
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\fIsigsuspend\fR(),
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\fIsigtimedwait\fR(),
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\fIsigwait\fR(),
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or
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\fIsigwaitinfo\fR(),
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the results are undefined.
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.SH "RETURN VALUE"
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Upon successful completion,
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\fIsigdelset\fR()
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shall return 0; otherwise, it shall return \(mi1 and set
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.IR errno
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to indicate the error.
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.SH ERRORS
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The
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\fIsigdelset\fR()
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function may fail if:
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.TP
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.BR EINVAL
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The
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.IR signo
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argument is not a valid signal number, or is an unsupported signal
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number.
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.LP
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.IR "The following sections are informative."
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.SH EXAMPLES
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None.
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.SH "APPLICATION USAGE"
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None.
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.SH RATIONALE
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None.
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.SH "FUTURE DIRECTIONS"
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None.
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.SH "SEE ALSO"
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.IR "Section 2.4" ", " "Signal Concepts",
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.IR "\fIpthread_sigmask\fR\^(\|)",
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.IR "\fIsigaction\fR\^(\|)",
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.IR "\fIsigaddset\fR\^(\|)",
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.IR "\fIsigemptyset\fR\^(\|)",
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.IR "\fIsigfillset\fR\^(\|)",
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.IR "\fIsigismember\fR\^(\|)",
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.IR "\fIsigpending\fR\^(\|)",
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.IR "\fIsigsuspend\fR\^(\|)"
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.P
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The Base Definitions volume of POSIX.1\(hy2008,
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.IR "\fB<signal.h>\fP"
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 7, Copyright (C) 2013 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group.
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(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.unix.org/online.html .
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Any typographical or formatting errors that appear
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in this page are most likely
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to have been introduced during the conversion of the source files to
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man page format. To report such errors, see
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https://www.kernel.org/doc/man-pages/reporting_bugs.html .
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