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| -rw-r--r-- | md/notes/undefined_c/titles.md | 87 |
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diff --git a/md/notes/undefined_c/titles.md b/md/notes/undefined_c/titles.md index ec8f0b5..3c6daa9 100644 --- a/md/notes/undefined_c/titles.md +++ b/md/notes/undefined_c/titles.md @@ -5,7 +5,9 @@ keywords:c,linux,asm There is possible to run piece of code inside online c compiler like https://www.onlinegdb.com/online_c_compiler Or run locally. With base check is done with gcc compiler. There are many small tricks around running C code -in practice that aren't covered in any generic tutorials. +in practice that aren't covered in any generic tutorials, so here is list of topics that may arise while +coding real C code outside of tutorials. For each case there is just small example, each of those could +take whole chapter on its own. ## Compile @@ -1210,11 +1212,94 @@ valgrind --leak-check=full --track-origins=yes --log-file=log.txt ./memleak2 ### Code coverage + +Compile file with extra flags and generate gcov file output. +Ther is only one branch not used. Coverage should show with part isnt used. + +```c +#include <stdio.h> + +int fun1(int a) { + if (a < 0) { + printf("Smaller then zero\n"); + } + if (a==0) { + printf("Equails to zero\n"); + } + if (a>0) { + printf("Bigger then zero\n"); + } +} + +int main() { + + printf("Start\n"); + fun1(0); + fun1(1); + + return 0; +} +``` + +``` +$ gcc -fprofile-arcs -ftest-coverage coverage.c -o coverage +$ gcov ./coverage +File 'coverage.c' +Lines executed:92.31% of 13 +Creating 'coverage.c.gcov' + +Lines executed:92.31% of 13 + +``` + +Gcov file content. So we scant see with line wasnt executed. + +```c + -: 0:Source:coverage.c + -: 0:Graph:coverage.gcno + -: 0:Data:coverage.gcda + -: 0:Runs:1 + -: 1:#include <stdio.h> + -: 2: + 2: 3:int fun1(int a) { + 2: 4: if (a < 0) { + #####: 5: printf("Smaller then zero\n"); + -: 6: } + 2: 7: if (a==0) { + 1: 8: printf("Equails to zero\n"); + -: 9: } + 2: 10: if (a>0) { + 1: 11: printf("Bigger then zero\n"); + -: 12: } + 2: 13:} + -: 14: + 1: 15:int main() { + -: 16: + 1: 17: printf("Start\n"); + 1: 18: fun1(0); + 1: 19: fun1(1); + -: 20: + 1: 21: return 0; + -: 22:} +``` + ### Profiling + + + + ### Canary + + ### Atomic + + ### Multithreading + + ### Write plugins + + ### Preload library |