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| author | Alejandro Colomar <alx.manpages@gmail.com> | 2022-09-05 23:03:38 +0200 |
|---|---|---|
| committer | Alejandro Colomar <alx.manpages@gmail.com> | 2022-09-05 23:03:47 +0200 |
| commit | 70ac1c4785fc1e158ab2349a962dba2526bf4fbc (patch) | |
| tree | bff270e2496dd284bccfc1271b43946f5d225224 /man/man3/sysv_signal.3 | |
| parent | 5423a6f86b2b920a5f3e8cf8d759b513050f2d33 (diff) | |
| download | man-pages-70ac1c4785fc1e158ab2349a962dba2526bf4fbc.tar.gz | |
src.mk, All pages: Move man* to man/
The root of the repository is becoming a bit overpopulated and
unorganized, due to the recent addition of more mandirs, and more
informative and configuration files too. Let's create a specific
mandir <man/> that contains the mandirs <man[1-8]*>.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Diffstat (limited to 'man/man3/sysv_signal.3')
| -rw-r--r-- | man/man3/sysv_signal.3 | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/man/man3/sysv_signal.3 b/man/man3/sysv_signal.3 new file mode 100644 index 0000000000..1faff92ab2 --- /dev/null +++ b/man/man3/sysv_signal.3 @@ -0,0 +1,92 @@ +.\" Copyright (c) 2007 Michael Kerrisk <mtk.manpages@gmail.com> +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.TH SYSV_SIGNAL 3 2021-03-22 "Linux man-pages (unreleased)" +.SH NAME +sysv_signal \- signal handling with System V semantics +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */" +.B #include <signal.h> +.PP +.B typedef void (*sighandler_t)(int); +.PP +.BI "sighandler_t sysv_signal(int " signum ", sighandler_t " handler ); +.fi +.SH DESCRIPTION +The +.BR sysv_signal () +function takes the same arguments, and performs the same task, as +.BR signal (2). +.PP +However +.BR sysv_signal () +provides the System V unreliable signal semantics, that is: +a) the disposition of the signal is reset to the default +when the handler is invoked; +b) delivery of further instances of the signal is not blocked while +the signal handler is executing; and +c) if the handler interrupts (certain) blocking system calls, +then the system call is not automatically restarted. +.SH RETURN VALUE +The +.BR sysv_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). +.ad l +.nh +.TS +allbox; +lbx lb lb +l l l. +Interface Attribute Value +T{ +.BR sysv_signal () +T} Thread safety MT-Safe +.TE +.hy +.ad +.sp 1 +.SH STANDARDS +This function is nonstandard. +.SH NOTES +Use of +.BR sysv_signal () +should be avoided; use +.BR sigaction (2) +instead. +.PP +On older Linux systems, +.BR sysv_signal () +and +.BR signal (2) +were equivalent. +But on newer systems, +.BR signal (2) +provides reliable 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 SEE ALSO +.BR sigaction (2), +.BR signal (2), +.BR bsd_signal (3), +.BR signal (7) |