diff options
Diffstat (limited to 'dev/c/index.html')
| -rw-r--r-- | dev/c/index.html | 199 |
1 files changed, 133 insertions, 66 deletions
diff --git a/dev/c/index.html b/dev/c/index.html index 1c3b478..aeff035 100644 --- a/dev/c/index.html +++ b/dev/c/index.html @@ -1,102 +1,169 @@ <!DOCTYPE html> <html dir="ltr" lang="en"> <head> - <meta charset='utf-8'> - <title>C & GDB</title> + <meta charset='utf-8'> + <title>C & GDB</title> </head> <body> - <a href="../index.html">Development Index</a> + <a href="../index.html">Development Index</a> - <h1>C & GDB</h1> + <h1>C & GDB</h1> - <p><a href="http://blog.fourthbit.com/2013/06/18/creating-an-open-source-program-in-c-with-autotools-part-1-of-2/">C program with autotools</a> - </p> + <h2 id="hello">Hello World</h2> - <pre> - $ touch NEWS README AUTHORS ChangeLog - $ mkdir -p src/bin src/lib - </pre> + <p>Create file hello.c with;</p> - <p> - <a href="http://web.eecs.umich.edu/~sugih/pointers/gdbQS.html">GDB Quick Start</a>, - <a href="https://www.hackerschool.com/blog/5-learning-c-with-gdb">Learning C with GDB</a> - and <a href="http://www.dirac.org/linux/gdb/02a-Memory_Layout_And_The_Stack.php">Memory Layout and the Stack</a> - are great sources of introductory information.</a> - </p> + <pre> + #include <stdio.h> - <p>To use gdb you need to compile program with -g flag. To - debug a program;</p> + int main() { + printf("Hello World!"); + return 0; + } + </pre> - <pre> - gdb program - </pre> + <p>Compile;</p> - <p>If the program needs arguments you can set it;</p> + <pre> + $ gcc -Wall hello.c -o hello + </pre> - <pre> - (gdb)set args -parameter1 -parameter2 - </pre> + <p>Run;</p> - <p>To start the program you can type run, this way gdb - will try to run the program until the end. If program - crash, gdb will stop it for debuging.</p> + <pre> + $./hello + Hello World! + </pre> - <pre> - (gdb) run - </pre> + <h2 ="sources">Multiple Sources</h2> - <pre> - n - execute next line - s - step in next line - b - backtrace - info locals - print - x - </pre> + <p>To organize code in multiple files split above + example in main.c, hello.c and hello.h. Content of + main.c;<p> - <h2>SysCalls</h2> + <pre> + #include "hello.h" - <pre>catch syscall open</pre> + int main() { + hello("world"); + return 0; + } + </pre> - <h2>Threads</h2> + <p>Header file contains declaration of the function hello, + content of hello.h;</p> - <p>When new thread is created you receive - a notification. To get information about - threads;</p> + <pre> + void hello(const char* name); + </pre> - <pre> - info threads - </pre> + <p>Implementation of hello function in hello.c;</p> - <p>To select thread;</p> + <pre> + #include <stdio.h> + #include "hello.h" - <pre> - thread 1 - </pre> + void hello(const char* name) { + printf("Hello, %s!\n", name); + } + </pre> + + <p>Compile;</p> + + <pre> + $ gcc -Wall main.c hello.c -o hello + </pre> + + <h2 id="makefile">Makefile</h2> + + <p>Make reads a Makefile by default on current directory, + Makefile defines targets, for example executables and their + dependencies, for example object files and source files.<p> + + <p>Create Makefile;</p> - <p><a href="http://ftp.gnu.org/old-gnu/Manuals/gdb/html_node/gdb_39.html#SEC40">Stopping and Starting</a> - multi-thread programs</p> + <pre> + CC=gcc + CFLAGS=-Wall + + hello: main.o hello.o + + clean: + rm -f hello main.o hello.o + </pre> + + <pre> + $ touch NEWS README AUTHORS ChangeLog + </pre> + + <h2 id="debug">Debug</h2> + + <p>To use gdb you need to compile program with -g flag. Change + Makefile</p> + + <pre> + CC=gcc + CFLAGS=-Wall -g + + hello: main.o hello.o + + clean: + rm -f hello main.o hello.o + </pre> + + <pre> + $ gdb hello + </pre> + + <p>Set break point;</p> + + <pre> + (gdb) break main + </pre> + + <p>To start the program you can type run, this way gdb + will try to run the program until the end. If program + crash, gdb will stop it for debuging. Start program;</p> + + <pre> + (gdb) run + </pre> + + <p>Step in next line;</p> + + <pre> + (gdb) s + </pre> + + <p>Print variable "name" value;</p> <pre> - break linespec thread threadno + (gdb) print name + $1 = 0x4005b0 "world" + (gdb) </pre> - <h2>Strace</h2> + <p>Print variable "name" type;</p> <pre> - strace -c ./program + (gdb) ptype name + type = const char * + (gdb) </pre> - <a href="../index.html">Development Index</a> - <p> - This is part of the c9-doc Manual. - Copyright (C) 2016 - c9 team. - See the file <a href="../../fdl-1.3-standalone.html">Gnu Free Documentation License</a> - for copying conditions.</p> + <p>Variable is a <a href="elements.html#const">string constant</a>. + Execute next line to end;</p> + <pre> + (gdb) n + </pre> + <a href="../index.html">Development Index</a> + <p> + This is part of the c9-doc Manual. + Copyright (C) 2016 + c9 team. + See the file <a href="../../fdl-1.3-standalone.html">Gnu Free Documentation License</a> + for copying conditions.</p> </body> - </html> - |