summaryrefslogtreecommitdiffstats
path: root/man3/bsd_signal.3
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 19:40:15 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 19:40:15 +0000
commit399644e47874bff147afb19c89228901ac39340e (patch)
tree1c4c0b733f4c16b5783b41bebb19194a9ef62ad1 /man3/bsd_signal.3
parentInitial commit. (diff)
downloadmanpages-399644e47874bff147afb19c89228901ac39340e.tar.xz
manpages-399644e47874bff147afb19c89228901ac39340e.zip
Adding upstream version 6.05.01.upstream/6.05.01
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man3/bsd_signal.3')
-rw-r--r--man3/bsd_signal.3113
1 files changed, 113 insertions, 0 deletions
diff --git a/man3/bsd_signal.3 b/man3/bsd_signal.3
new file mode 100644
index 0000000..3294c5c
--- /dev/null
+++ b/man3/bsd_signal.3
@@ -0,0 +1,113 @@
+'\" t
+.\" Copyright (c) 2007 Michael Kerrisk <mtk.manpages@gmail.com>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.TH bsd_signal 3 2023-07-20 "Linux man-pages 6.05.01"
+.SH NAME
+bsd_signal \- signal handling with BSD semantics
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <signal.h>
+.PP
+.B typedef void (*sighandler_t)(int);
+.PP
+.BI "sighandler_t bsd_signal(int " signum ", sighandler_t " handler );
+.fi
+.PP
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.PP
+.BR bsd_signal ():
+.nf
+ Since glibc 2.26:
+ _XOPEN_SOURCE >= 500
+.\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
+ && ! (_POSIX_C_SOURCE >= 200809L)
+ glibc 2.25 and earlier:
+ _XOPEN_SOURCE
+.fi
+.SH DESCRIPTION
+The
+.BR bsd_signal ()
+function takes the same arguments, and performs the same task, as
+.BR signal (2).
+.PP
+The difference between the two is that
+.BR bsd_signal ()
+is guaranteed to provide reliable signal semantics, that is:
+a) the disposition of the signal is not reset to the default
+when the handler is invoked;
+b) delivery of further instances of the signal is blocked while
+the signal handler is executing; and
+c) if the handler interrupts a blocking system call,
+then the system call is automatically restarted.
+A portable application cannot rely on
+.BR signal (2)
+to provide these guarantees.
+.SH RETURN VALUE
+The
+.BR bsd_signal ()
+function returns the previous value of the signal handler, or
+.B SIG_ERR
+on error.
+.SH ERRORS
+As for
+.BR signal (2).
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface Attribute Value
+T{
+.na
+.nh
+.BR bsd_signal ()
+T} Thread safety MT-Safe
+.TE
+.sp 1
+.SH VERSIONS
+Use of
+.BR bsd_signal ()
+should be avoided; use
+.BR sigaction (2)
+instead.
+.PP
+On modern Linux systems,
+.BR bsd_signal ()
+and
+.BR signal (2)
+are equivalent.
+But on older systems,
+.BR signal (2)
+provided unreliable signal semantics; see
+.BR signal (2)
+for details.
+.PP
+The use of
+.I sighandler_t
+is a GNU extension;
+this type is defined only if the
+.B _GNU_SOURCE
+feature test macro is defined.
+.SH STANDARDS
+None.
+.SH HISTORY
+4.2BSD, POSIX.1-2001.
+Removed in POSIX.1-2008,
+recommending the use of
+.BR sigaction (2)
+instead.
+.SH SEE ALSO
+.BR sigaction (2),
+.BR signal (2),
+.BR sysv_signal (3),
+.BR signal (7)