This a step-by-step example of how to create the files for GNU automake. Put the C source file in directory src ( cat src/hello.c ): #include <config.h> #include <stdio.h> ... Run autoscan to generate configure.scan . Rename configure.scan : mv configure.scan configure.ac Edit autoscan.ac . Update this line: AC_INIT([FULL-PACKAGE-NAME], [VERSION] , [BUG-REP... Add this line after AC_INIT : AM_INIT_AUTOMAKE([foreign -Wall -Werror]) Add this line before AC_OUTPUT : AC_CONFIG_FILES([Makefile src/Makefile]) Create file Makefile.am ( cat Makefile.am ): SUBDIRS = src Create file src/Makefile.am ( cat src/Makefile.am ): bin_PROGRAMS = hello hello_SOURCES = hello.c Run these commands: $ aclocal $ autoheader $ automake --add-miss... The file configure is generated after autoconf is run. Build with: $ ./configure $ make Create tarball for distribution with: $ make dist...

In the case proposed by Diony , signing multiple elements by id, simply change the newSignedInfo to: // Create the SignedInfo final List transforms0... I must admit that I don't understand transformations, so take my example code with a grain of salt. Also, signing a doc fragment by PATH does not work, simply because there's no way to identify the fragment with a URI without referring to it by id. Reference ode from org.jcp.xml.dsig.internal.dom.DOMURIDereferencer : // Check if same-document URI and register...

Use getpwnam group of functions. Example code: #include <sys/types.h> #include <pwd.h> #inc... For gid, use getgrnam

The C function strtok tokenizes a string when you call it repeated with a NULL pointer. It should be mentioned that it destroys (alters) the original string. #include <stdio.h> #include <stdlib.h> #incl...

Code snippet to check user name and password in C in Linux #include <sys/types.h> #include <pwd.h> #inc...

First, the test command that sleeps random number of seconds ( sleeper.sh ): #!/bin/bash stime=$[$RANDOM % 20] sleep $sti... As comparison, synchronous pipe code: #include <sys/wait.h> #include <stdio.h> #in... Asynchronous pipe code: #include <sys/wait.h> #include <stdio.h> #in...

Example 1, from the pipe man page. The parent then writes the string contained in the program's command-line argument to the pipe, and the child reads this string a byte at a time from the pipe and echoes it on standard output. #include <sys/wait.h> #include <stdio.h> #in... Example 2, child execs command given at the command line, then writes to stdout (of child), which is piped to parent. Parent reads from pipe and writes to stdout (of parent). #include <sys/wait.h> #include <stdio.h> #in...

Example code from the Linux Programmer's Manual: #include <stdio.h> #include <stdlib.h> #incl...

Start gdb with the executable and coredump: $ gdb <path to executable> core While in the debugger, use the following commands: (gdb) where ("shows a summary of the stack") ... Example debug session from Debugging Under Unix: gdb Tutorial : Use backtrace (or bt ) to see the callstack: (gdb) backtrace #0 Node<int>::next (this=0x0) ... Inspect the value of item_to_remove at address 0xffbef014 (the value is 1): (gdb) x 0xffbef014 0xffbef014: 0x00000001 (g... Note: The program must be compiled with the debug switch -g in order to see the source code. More resources: Linux software debugging with GDB Debugging with gdb

Allocate 2-dimensional array with one malloc/calloc. Example1: #include <stdio.h> #include <stdlib.h> i... Example 2: #include <stdio.h> #include <stdlib.h> s...