Created
February 6, 2026 04:47
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Cleanup attribute check for gcc
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| // gcc -g -O2 -Wall -std=c2x file.c -o file | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| static void cleanup_free(void * p) { | |
| free(*(void **)p); | |
| } | |
| void leak_check_test() { | |
| __attribute__((cleanup(cleanup_free))) char * c = malloc(100); | |
| if (c == NULL) { | |
| printf("Memory allocation failed\n"); | |
| return; | |
| } | |
| printf("Data processed\n"); | |
| } | |
| int main() { | |
| leak_check_test(); | |
| return 0; | |
| } | |
| // valgrind --tool=memcheck ./cleanup | |
| // ==550226== Memcheck, a memory error detector | |
| // ==550226== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al. | |
| // ==550226== Using Valgrind-3.19.0 and LibVEX; rerun with -h for copyright info | |
| // ==550226== Command: ./cleanup | |
| // ==550226== | |
| // Data processed | |
| // ==550226== | |
| // ==550226== HEAP SUMMARY: | |
| // ==550226== in use at exit: 0 bytes in 0 blocks | |
| // ==550226== total heap usage: 2 allocs, 2 frees, 1,124 bytes allocated | |
| // ==550226== | |
| // ==550226== All heap blocks were freed -- no leaks are possible | |
| // ==550226== | |
| // ==550226== For lists of detected and suppressed errors, rerun with: -s | |
| // ==550226== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) |
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