HP-UX Reference (11i v1 05/09) - 2 System Calls (vol 5)

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sigaction(2) sigaction(2)

• The type of argument act is changed from

struct sigaction * to const struct sigac-

tion *

• A statement is added to the DESCRIPTION section indicating that the consequence of attempting

to set

SIG_DFL for a signal that cannot be caught or ignored is unspeciﬁed. The [EINVAL] error,

describing one possible reaction to this condition, is added to the ERRORS section.

Other changes are incorporated as follows:

• The

raise() and signal() functions are added to the list of functions that are either reen-

trant or not interruptible by signals;

fpathconf() is also added to this list and marked as an

extension;

ustat() is removed from the list, as this function is withdrawn from the interface

deﬁnition. It is no longer speciﬁed whether

abort(), chroot(), exit(), and longjmp()

also fall into this category of functions.

• The APPLICATIONUSAGE section is added. Most of this text is moved from the DESCRIPTION

section in Issue 3.

• The WARNINGS section is added.

Issue 4, Version 2

The following changes are incorporated for X/OPEN UNIX conformance:

• The DESCRIPTION describes

sa_sigaction , the member of the sigaction structure that is the

signal-catching function.

• The DESCRIPTION describes the SA_ONSTACK , SA_RESETHAND , SA_RESTART ,

SA_SIGINFO , SA_NOCLDWAIT , and SA_NODEFER settings of sa_ﬂags. The text describes the

implications of the use of SA_SIGINFO for the number of arguments passed to the signal-catching

function. The text also describes the effects of the SA_NODEFER and SA_RESETHAND ﬂags on

the delivery of a signal and on the permanence of an installed action.

• The DESCRIPTION speciﬁes the effect if the action for the

SIGCHLD signal is set to

SIG_IGN.

• In the DESCRIPTION, additional text describes the effect if the action is a pointer to a function. A

new bullet covers the case where

SA_SIGINFO is set. SIGBUS is given as an additional signal

for which the behaviour of a process is undeﬁned following a normal return from the signal-

catching function.

• The APPLICATION USAGE section is updated to describe use of an alternate signal stack;

resumption of the process receiving the signal; coding for compatibility with POSIX.4-1993; and

implementation of signal-handling functions in BSD.

HP-UX 11i Version 1: September 2005 − 7 − Hewlett-Packard Company Section 2−−361