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-'\" t
-.\" Copyright (c) 2005 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH sigvec 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-sigvec, sigblock, sigsetmask, siggetmask, sigmask \- BSD signal API
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <signal.h>
-.PP
-.BI "[[deprecated]] int sigvec(int " sig ", const struct sigvec *" vec ,
-.BI "                          struct sigvec *" ovec );
-.PP
-.BI "[[deprecated]] int sigmask(int " signum );
-.PP
-.BI "[[deprecated]] int sigblock(int " mask );
-.BI "[[deprecated]] int sigsetmask(int " mask );
-.B [[deprecated]] int siggetmask(void);
-.fi
-.PP
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.PP
-All functions shown above:
-.nf
-    Since glibc 2.19:
-        _DEFAULT_SOURCE
-    glibc 2.19 and earlier:
-        _BSD_SOURCE
-.fi
-.SH DESCRIPTION
-These functions are provided in glibc as a compatibility interface
-for programs that make use of the historical BSD signal API.
-This API is obsolete: new applications should use the POSIX signal API
-.RB ( sigaction (2),
-.BR sigprocmask (2),
-etc.).
-.PP
-The
-.BR sigvec ()
-function sets and/or gets the disposition of the signal
-.I sig
-(like the POSIX
-.BR sigaction (2)).
-If
-.I vec
-is not NULL, it points to a
-.I sigvec
-structure that defines the new disposition for
-.IR sig .
-If
-.I ovec
-is not NULL, it points to a
-.I sigvec
-structure that is used to return the previous disposition of
-.IR sig .
-To obtain the current disposition of
-.I sig
-without changing it, specify NULL for
-.IR vec ,
-and a non-null pointer for
-.IR ovec .
-.PP
-The dispositions for
-.B SIGKILL
-and
-.B SIGSTOP
-cannot be changed.
-.PP
-The
-.I sigvec
-structure has the following form:
-.PP
-.in +4n
-.EX
-struct sigvec {
-    void (*sv_handler)(int); /* Signal disposition */
-    int    sv_mask;          /* Signals to be blocked in handler */
-    int    sv_flags;         /* Flags */
-};
-.EE
-.in
-.PP
-The
-.I sv_handler
-field specifies the disposition of the signal, and is either:
-the address of a signal handler function;
-.BR SIG_DFL ,
-meaning the default disposition applies for the signal; or
-.BR SIG_IGN ,
-meaning that the signal is ignored.
-.PP
-If
-.I sv_handler
-specifies the address of a signal handler, then
-.I sv_mask
-specifies a mask of signals that are to be blocked while
-the handler is executing.
-In addition, the signal for which the handler is invoked is
-also blocked.
-Attempts to block
-.B SIGKILL
-or
-.B SIGSTOP
-are silently ignored.
-.PP
-If
-.I sv_handler
-specifies the address of a signal handler, then the
-.I sv_flags
-field specifies flags controlling what happens when the handler is called.
-This field may contain zero or more of the following flags:
-.TP
-.B SV_INTERRUPT
-If the signal handler interrupts a blocking system call,
-then upon return from the handler the system call is not restarted:
-instead it fails with the error
-.BR EINTR .
-If this flag is not specified, then system calls are restarted
-by default.
-.TP
-.B SV_RESETHAND
-Reset the disposition of the signal to the default
-before calling the signal handler.
-If this flag is not specified, then the handler remains established
-until explicitly removed by a later call to
-.BR sigvec ()
-or until the process performs an
-.BR execve (2).
-.TP
-.B SV_ONSTACK
-Handle the signal on the alternate signal stack
-(historically established under BSD using the obsolete
-.BR sigstack ()
-function; the POSIX replacement is
-.BR sigaltstack (2)).
-.PP
-The
-.BR sigmask ()
-macro constructs and returns a "signal mask" for
-.IR signum .
-For example, we can initialize the
-.I vec.sv_mask
-field given to
-.BR sigvec ()
-using code such as the following:
-.PP
-.in +4n
-.EX
-vec.sv_mask = sigmask(SIGQUIT) | sigmask(SIGABRT);
-            /* Block SIGQUIT and SIGABRT during
-               handler execution */
-.EE
-.in
-.PP
-The
-.BR sigblock ()
-function adds the signals in
-.I mask
-to the process's signal mask
-(like POSIX
-.IR sigprocmask(SIG_BLOCK) ),
-and returns the process's previous signal mask.
-Attempts to block
-.B SIGKILL
-or
-.B SIGSTOP
-are silently ignored.
-.PP
-The
-.BR sigsetmask ()
-function sets the process's signal mask to the value given in
-.I mask
-(like POSIX
-.IR sigprocmask(SIG_SETMASK) ),
-and returns the process's previous signal mask.
-.PP
-The
-.BR siggetmask ()
-function returns the process's current signal mask.
-This call is equivalent to
-.IR sigblock(0) .
-.SH RETURN VALUE
-The
-.BR sigvec ()
-function returns 0 on success; on error, it returns \-1 and sets
-.I errno
-to indicate the error.
-.PP
-The
-.BR sigblock ()
-and
-.BR sigsetmask ()
-functions return the previous signal mask.
-.PP
-The
-.BR sigmask ()
-macro returns the signal mask for
-.IR signum .
-.SH ERRORS
-See the ERRORS under
-.BR sigaction (2)
-and
-.BR sigprocmask (2).
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.BR sigvec (),
-.BR sigmask (),
-.BR sigblock (),
-.BR sigsetmask (),
-.BR siggetmask ()
-T}	Thread safety	MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-None.
-.SH HISTORY
-.TP
-.BR sigvec ()
-.TQ
-.BR sigblock ()
-.TQ
-.BR sigmask ()
-.TQ
-.BR sigsetmask ()
-4.3BSD.
-.TP
-.BR siggetmask ()
-Unclear origin.
-.TP
-.BR sigvec ()
-Removed in glibc 2.21.
-.SH NOTES
-On 4.3BSD, the
-.BR signal ()
-function provided reliable semantics (as when calling
-.BR sigvec ()
-with
-.I vec.sv_mask
-equal to 0).
-On System V,
-.BR signal ()
-provides unreliable semantics.
-POSIX.1 leaves these aspects of
-.BR signal ()
-unspecified.
-See
-.BR signal (2)
-for further details.
-.PP
-In order to wait for a signal,
-BSD and System V both provided a function named
-.BR sigpause (3),
-but this function has a different argument on the two systems.
-See
-.BR sigpause (3)
-for details.
-.SH SEE ALSO
-.BR kill (2),
-.BR pause (2),
-.BR sigaction (2),
-.BR signal (2),
-.BR sigprocmask (2),
-.BR raise (3),
-.BR sigpause (3),
-.BR sigset (3),
-.BR signal (7)