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Full Discussion: Nanosleep in signal call
Top Forums Programming Nanosleep in signal call Post 302963489 by jim mcnamara on Thursday 31st of December 2015 10:05:18 AM
Old 12-31-2015
I am guessing you do not want signal handling at all, other than cleaning up open files and buffers when your app gets a SIGTERM, for example.

Why? read.

This says you are designing an app that has an associated process that is doing reads.
Consider another standard IPC model instead. They are a much better choice if you must do reads in one process.

Overview:
http://www.tldp.org/LDP/tlk/ipc/ipc.html

Pipes are great, they are very like playing with files.
The GNU C Library: Creating a Pipe


Shared memory among processes is also a great feature. You can atomically set a variable in shared memory, then execute a read into a buffer there.
Use semaphores for traffic control. This one is straightforward to get right.
shm_overview(7) - Linux manual page

Overall, consider getting a copy of 3rd Edition of Stevens & Rago 'Advanced Programming in the UNIX Environment'. Michael Kerrisk has done the same thing purely for Linux - 'The LINUX Programming Interface'

Both of these have great examples of all of IPC, and explain how not to shoot yourself in the foot. Like you seemed to want to do. They fully cover signals as well, if you cannot change your system design, and have to continue into the Dark Side.

Have a good New Year!
Last edited by jim mcnamara; 12-31-2015 at 11:11 AM..
 

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gnutls_pkcs11_token_get_url

gnutls_pkcs11_token_get_url(3)					      gnutls					    gnutls_pkcs11_token_get_url(3)

NAME

       gnutls_pkcs11_token_get_url - API function

SYNOPSIS

       #include <gnutls/pkcs11.h>

       int gnutls_pkcs11_token_get_url(unsigned int seq, gnutls_pkcs11_url_type_t detailed, char ** url);

ARGUMENTS

       unsigned int seq
		   sequence number starting from 0

       gnutls_pkcs11_url_type_t detailed
		   non zero if a detailed URL is required

       char ** url will contain an allocated url

DESCRIPTION

       This function will return the URL for each token available in system. The url has to be released using gnutls_free()

RETURNS

       On  success,  GNUTLS_E_SUCCESS  (0) is returned, GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE if the sequence number exceeds the available tokens,
       otherwise a negative error value.

SINCE

       2.12.0

REPORTING BUGS

       Report bugs to <bug-gnutls@gnu.org>.
       General guidelines for reporting bugs: http://www.gnu.org/gethelp/
       GnuTLS home page: http://www.gnu.org/software/gnutls/

COPYRIGHT

       Copyright (C) 2012 Free Software Foundation, Inc..
       Copying and distribution of this file, with or without modification, are permitted in any medium without  royalty  provided  the  copyright
       notice and this notice are preserved.

SEE ALSO

       The  full documentation for gnutls is maintained as a Texinfo manual.  If the info and gnutls programs are properly installed at your site,
       the command

	      info gnutls

       should give you access to the complete manual.  As an alternative you may obtain the manual from:

	      http://www.gnu.org/software/gnutls/manual/

gnutls								      3.1.15					    gnutls_pkcs11_token_get_url(3)
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