Free Knowledge Resources


Linux Manual Pages


Free Software * Books

Source Code

Free Media

Linux

siginterrupt(3)


NAME

   siginterrupt - allow signals to interrupt system calls

SYNOPSIS

   #include <signal.h>

   int siginterrupt(int sig, int flag);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

   siginterrupt():
       _XOPEN_SOURCE >= 500
           || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
           || /* Glibc versions <= 2.19: */ _BSD_SOURCE

DESCRIPTION

   The  siginterrupt() function changes the restart behavior when a system
   call is interrupted by the signal sig.  If the flag argument  is  false
   (0),  then  system  calls  will  be  restarted  if  interrupted  by the
   specified signal sig.  This is the default behavior in Linux.

   If the flag argument is true (1) and no data has been transferred, then
   a  system  call  interrupted by the signal sig will return -1 and errno
   will be set to EINTR.

   If the flag argument is true (1) and data transfer  has  started,  then
   the  system  call will be interrupted and will return the actual amount
   of data transferred.

RETURN VALUE

   The siginterrupt() function returns 0 on success.  It returns -1 if the
   signal  number  sig is invalid, with errno set to indicate the cause of
   the error.

ERRORS

   EINVAL The specified signal number is invalid.

ATTRIBUTES

   For  an  explanation  of  the  terms  used   in   this   section,   see
   attributes(7).

   
   Interface       Attribute      Value                   
   
   siginterrupt()  Thread safety  MT-Unsafe const:sigintr

CONFORMING TO

   4.3BSD,  POSIX.1-2001.   POSIX.1-2008 marks siginterrupt() as obsolete,
   recommending the use of sigaction(2) with the SA_RESTART flag instead.

SEE ALSO

   signal(2)

COLOPHON

   This page is part of release 4.09 of the Linux  man-pages  project.   A
   description  of  the project, information about reporting bugs, and the
   latest    version    of    this    page,    can     be     found     at
   https://www.kernel.org/doc/man-pages/.

                              2016-03-15                   SIGINTERRUPT(3)



Opportunity


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.



Free Software


Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.



Free Books


The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.



Education


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.


birds banner