Как избежать «возможной потери» памяти при использовании callo c для выделения памяти для массива char в C - PullRequest
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Как избежать «возможной потери» памяти при использовании callo c для выделения памяти для массива char в C

3 голосов
/ 11 марта 2020

Я надеюсь избежать любых утечек памяти в программе, которая должна прочитать аргумент командной строки, который является путем к файлу параметра, который будет прочитан. Если я скомпилирую следующую программу и проверим исполняемый файл с valgrind, я все равно получу leak summary с possibly lost: 72 bytes in 3 blocks. Как избежать утечек памяти в следующих настройках?

Большое спасибо заранее за помощь! 

// main.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "constant.h"

void set_up_parameters(parameters *params, int argc, char **argv) {
    char *input_file_name_ptr;
    input_file_name_ptr = calloc((INPUT_CHAR_LEN + 1), sizeof(char));
    if (input_file_name_ptr == NULL) {
        printf("Cannot allocate input_file_name_ptr\n");
        exit(1);
    }
    params->input_file_name = input_file_name_ptr;
}

int main(int argc, char *argv[]) {
    parameters *params_ptr;
    params_ptr = NULL;
    params_ptr = calloc(1, sizeof(parameters));
    if (params_ptr == NULL) {
        printf("Cannot allocate parameters\n");
        exit(1);
    }

    set_up_parameters(params_ptr, argc, argv);

    free(params_ptr->input_file_name);
    free(params_ptr);
    return 0;
}

, где мой файл constant.h выглядит следующим образом: 

#define INPUT_CHAR_LEN 100

typedef struct {
    char *input_file_name;
    int n_params;
} parameters;

Обновление

Большое спасибо за все ответы , Я настроил включить строку free(params); в set_up_parameters() непосредственно перед exit(1), как было предложено. Затем я скомпилировал, используя следующее: 

gcc -c -O3 -ggdb3 main.c
gcc main.o -o check.exe

Я получил вывод из valgrind (используя команду valgrind --leak-check=full --show-leak-kinds=all --verbose --track-origins=yes --log-file=valgrind.log ./check.exe), который был следующим: 

==39172== Memcheck, a memory error detector
==39172== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==39172== Using Valgrind-3.15.0-608cb11914-20190413 and LibVEX; rerun with -h for copyright info
==39172== Command: ./check.exe
==39172== Parent PID: 33579
==39172== 
--39172-- 
--39172-- Valgrind options:
--39172--    --leak-check=full
--39172--    --show-leak-kinds=all
--39172--    --verbose
--39172--    --track-origins=yes
--39172--    --log-file=valgrind.log
--39172-- Output from sysctl({CTL_KERN,KERN_VERSION}):
--39172--   Darwin Kernel Version 17.7.0: Fri Oct  4 23:08:59 PDT 2019; root:xnu-4570.71.57~1/RELEASE_X86_64
--39172-- Arch and hwcaps: AMD64, LittleEndian, amd64-cx16-lzcnt-rdtscp-sse3-ssse3-avx-avx2-bmi-f16c-rdrand
--39172-- Page sizes: currently 4096, max supported 4096
--39172-- Valgrind library directory: /usr/local/Cellar/valgrind/3.15.0/lib/valgrind
--39172-- ./check.exe (rx at 0x100000000, rw at 0x100001000)
--39172--    reading syms   from primary file (3 12)
--39172--    dSYM= ./check.exe.dSYM/Contents/Resources/DWARF/check.exe
--39172--    reading dwarf3 from dsyms file
--39172-- /usr/lib/dyld (rx at 0x100003000, rw at 0x10004e000)
--39172--    reading syms   from primary file (5 1487)
--39172-- Scheduler: using generic scheduler lock implementation.
--39172-- Reading suppressions file: /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/default.supp
.... (removed lines due to links to personal dirs)
==39172== 
==39172== TO CONTROL THIS PROCESS USING vgdb (which you probably
==39172== don't want to do, unless you know exactly what you're doing,
==39172== or are doing some strange experiment):
==39172==   /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/../../bin/vgdb --pid=39172 ...command...
==39172== 
==39172== TO DEBUG THIS PROCESS USING GDB: start GDB like this
==39172==   /path/to/gdb ./check.exe
==39172== and then give GDB the following command
==39172==   target remote | /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/../../bin/vgdb --pid=39172
==39172== --pid is optional if only one valgrind process is running
==39172== 
--39172-- REDIR: 0x100030ac0 (dyld:strcmp) redirected to 0x258057de2 (???)
--39172-- REDIR: 0x10002abac (dyld:arc4random) redirected to 0x258057e80 (???)
--39172-- REDIR: 0x10002aa60 (dyld:strlen) redirected to 0x258057db1 (???)
--39172-- REDIR: 0x10002a9c0 (dyld:strcpy) redirected to 0x258057dfe (???)
--39172-- REDIR: 0x10002e0e6 (dyld:strcat) redirected to 0x258057dc2 (???)
--39172-- REDIR: 0x10002e124 (dyld:strlcat) redirected to 0x258057e1b (???)
--39172-- /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/vgpreload_core-amd64-darwin.so (rx at 0x1000a1000, rw at 0x1000a7000)
--39172--    reading syms   from primary file (3 93)
--39172--    dSYM= /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/vgpreload_core-amd64-darwin.so.dSYM/Contents/Resources/DWARF/vgpreload_core-amd64-darwin.so
--39172-- /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so (rx at 0x1000ab000, rw at 0x1000b3000)
--39172--    reading syms   from primary file (72 102)
--39172--    dSYM= /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so.dSYM/Contents/Resources/DWARF/vgpreload_memcheck-amd64-darwin.so
--39172-- /usr/lib/libSystem.B.dylib (rx at 0x1000b9000, rw at 0x1000bb000)
--39172--    reading syms   from primary file (31 5)
--39172-- /usr/lib/system/libcache.dylib (rx at 0x1000c1000, rw at 0x1000c6000)
--39172--    reading syms   from primary file (32 29)
--39172-- /usr/lib/system/libcommonCrypto.dylib (rx at 0x1000cb000, rw at 0x1000d6000)
--39172--    reading syms   from primary file (221 169)
--39172-- /usr/lib/system/libcompiler_rt.dylib (rx at 0x1000e3000, rw at 0x1000eb000)
--39172--    reading syms   from primary file (510 8)
--39172-- /usr/lib/system/libcopyfile.dylib (rx at 0x1000f8000, rw at 0x100102000)
--39172--    reading syms   from primary file (13 35)
--39172-- /usr/lib/system/libcorecrypto.dylib (rx at 0x100108000, rw at 0x10018e000)
--39172--    reading syms   from primary file (512 677)
--39172-- /usr/lib/system/libdispatch.dylib (rx at 0x1001aa000, rw at 0x1001e4000)
--39172--    reading syms   from primary file (271 945)
--39172-- /usr/lib/system/libdyld.dylib (rx at 0x10021e000, rw at 0x10023c000)
--39172--    reading syms   from primary file (97 992)
--39172-- /usr/lib/system/libkeymgr.dylib (rx at 0x100256000, rw at 0x100257000)
--39172--    reading syms   from primary file (12 3)
--39172-- /usr/lib/system/libmacho.dylib (rx at 0x100262000, rw at 0x100267000)
--39172--    reading syms   from primary file (105 1)
--39172-- /usr/lib/system/libquarantine.dylib (rx at 0x10026d000, rw at 0x100270000)
--39172--    reading syms   from primary file (67 6)
--39172-- /usr/lib/system/libremovefile.dylib (rx at 0x100275000, rw at 0x100277000)
--39172--    reading syms   from primary file (15 4)
--39172-- /usr/lib/system/libsystem_asl.dylib (rx at 0x10027c000, rw at 0x100294000)
--39172--    reading syms   from primary file (222 225)
--39172-- /usr/lib/system/libsystem_blocks.dylib (rx at 0x1002a1000, rw at 0x1002a2000)
--39172--    reading syms   from primary file (21 6)
--39172-- /usr/lib/system/libsystem_c.dylib (rx at 0x1002a6000, rw at 0x100330000)
--39172--    reading syms   from primary file (1342 806)
--39172-- /usr/lib/system/libsystem_configuration.dylib (rx at 0x100358000, rw at 0x10035c000)
--39172--    reading syms   from primary file (38 66)
--39172-- /usr/lib/system/libsystem_coreservices.dylib (rx at 0x100362000, rw at 0x100366000)
--39172--    reading syms   from primary file (14 37)
--39172-- /usr/lib/system/libsystem_darwin.dylib (rx at 0x10036b000, rw at 0x10036d000)
--39172--    reading syms   from primary file (12 105)
--39172-- /usr/lib/system/libsystem_dnssd.dylib (rx at 0x100372000, rw at 0x100379000)
--39172--    reading syms   from primary file (49 24)
--39172-- /usr/lib/system/libsystem_info.dylib (rx at 0x10037f000, rw at 0x1003c9000)
--39172--    reading syms   from primary file (525 650)
--39172-- /usr/lib/system/libsystem_m.dylib (rx at 0x1003e0000, rw at 0x10042c000)
--39172--    reading syms   from primary file (805 1)
--39172-- /usr/lib/system/libsystem_malloc.dylib (rx at 0x10043a000, rw at 0x10045a000)
--39172--    reading syms   from primary file (127 264)
--39172-- /usr/lib/system/libsystem_network.dylib (rx at 0x100466000, rw at 0x100597000)
--39172--    reading syms   from primary file (1126 1216)
--39172-- /usr/lib/system/libsystem_networkextension.dylib (rx at 0x1005d7000, rw at 0x1005e2000)
--39172--    reading syms   from primary file (98 229)
--39172-- /usr/lib/system/libsystem_notify.dylib (rx at 0x1005ee000, rw at 0x1005f8000)
--39172--    reading syms   from primary file (113 54)
--39172-- /usr/lib/system/libsystem_sandbox.dylib (rx at 0x1005ff000, rw at 0x100603000)
--39172--    reading syms   from primary file (93 8)
--39172-- /usr/lib/system/libsystem_secinit.dylib (rx at 0x100609000, rw at 0x10060b000)
--39172--    reading syms   from primary file (1 7)
--39172-- /usr/lib/system/libsystem_kernel.dylib (rx at 0x100610000, rw at 0x100637000)
--39172--    reading syms   from primary file (1282 100)
--39172-- /usr/lib/system/libsystem_platform.dylib (rx at 0x100650000, rw at 0x100658000)
--39172--    reading syms   from primary file (157 101)
--39172-- /usr/lib/system/libsystem_pthread.dylib (rx at 0x100660000, rw at 0x10066c000)
--39172--    reading syms   from primary file (178 77)
--39172-- /usr/lib/system/libsystem_symptoms.dylib (rx at 0x100678000, rw at 0x100680000)
--39172--    reading syms   from primary file (10 93)
--39172-- /usr/lib/system/libsystem_trace.dylib (rx at 0x100686000, rw at 0x10069a000)
--39172--    reading syms   from primary file (114 245)
--39172-- /usr/lib/system/libunwind.dylib (rx at 0x1006a8000, rw at 0x1006ae000)
--39172--    reading syms   from primary file (102 52)
--39172-- /usr/lib/system/libxpc.dylib (rx at 0x1006b5000, rw at 0x1006e3000)
--39172--    reading syms   from primary file (567 915)
--39172-- /usr/lib/closure/libclosured.dylib (rx at 0x100705000, rw at 0x100739000)
--39172--    reading syms   from primary file (1 966)
--39172-- /usr/lib/libobjc.A.dylib (rx at 0x100754000, rw at 0x100b43000)
--39172--    reading syms   from primary file (369 902)
--39172-- /usr/lib/libc++abi.dylib (rx at 0x100cf3000, rw at 0x100d18000)
--39172--    reading syms   from primary file (369 212)
--39172-- /usr/lib/libc++.1.dylib (rx at 0x100d27000, rw at 0x100d7e000)
--39172--    reading syms   from primary file (2023 1681)
--39172-- REDIR: 0x100650ac0 (libsystem_platform.dylib:_platform_memchr$VARIANT$Haswell) redirected to 0x1000adbc5 (_platform_memchr$VARIANT$Haswell)
--39172-- REDIR: 0x100650ba0 (libsystem_platform.dylib:_platform_memcmp) redirected to 0x1000ae2b2 (_platform_memcmp)
--39172-- REDIR: 0x1006510e0 (libsystem_platform.dylib:_platform_strncmp) redirected to 0x1000adaca (_platform_strncmp)
--39172-- REDIR: 0x1002a7220 (libsystem_c.dylib:strlen) redirected to 0x1000ad75b (strlen)
--39172-- REDIR: 0x1006516a0 (libsystem_platform.dylib:_platform_strcmp) redirected to 0x1000adb44 (_platform_strcmp)
--39172-- REDIR: 0x10043e5f4 (libsystem_malloc.dylib:calloc) redirected to 0x1000ac62f (calloc)
--39172-- REDIR: 0x10043dca0 (libsystem_malloc.dylib:malloc_default_zone) redirected to 0x1000ad36c (malloc_default_zone)
--39172-- REDIR: 0x10043c1da (libsystem_malloc.dylib:malloc_zone_malloc) redirected to 0x1000ac27b (malloc_zone_malloc)
--39172-- REDIR: 0x10043dca9 (libsystem_malloc.dylib:malloc_zone_calloc) redirected to 0x1000ac81d (malloc_zone_calloc)
--39172-- REDIR: 0x10043b5a7 (libsystem_malloc.dylib:malloc) redirected to 0x1000ac010 (malloc)
--39172-- REDIR: 0x10043dd71 (libsystem_malloc.dylib:malloc_zone_from_ptr) redirected to 0x1000ad3ad (malloc_zone_from_ptr)
--39172-- REDIR: 0x10043d69d (libsystem_malloc.dylib:free) redirected to 0x1000ac3f1 (free)
--39172-- REDIR: 0x10043e7a7 (libsystem_malloc.dylib:realloc) redirected to 0x1000ac9b1 (realloc)
--39172-- REDIR: 0x1006512c0 (libsystem_platform.dylib:_platform_strchr$VARIANT$Haswell) redirected to 0x1000ad61f (_platform_strchr$VARIANT$Haswell)
==39172== 
==39172== HEAP SUMMARY:
==39172==     in use at exit: 18,306 bytes in 163 blocks
==39172==   total heap usage: 184 allocs, 21 frees, 26,754 bytes allocated
==39172== 
==39172== Searching for pointers to 163 not-freed blocks
==39172== Checked 10,808,216 bytes
==39172== 
==39172== 24 bytes in 1 blocks are still reachable in loss record 3 of 42
==39172==    at 0x1000AC2FE: malloc_zone_malloc (in /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==39172==    by 0x100757928: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007578FA: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007563CB: __sel_registerName(char const*, int, int) (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007560DA: sel_init (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007559AD: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007687DA: objc_object::sidetable_retainCount() (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100007C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==39172==    by 0x100007E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==39172==    by 0x10022171D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==39172==    by 0x100755075: _objc_init (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1001ABB34: _os_object_init (in /usr/lib/system/libdispatch.dylib)
==39172== 
==39172== 32 bytes in 1 blocks are still reachable in loss record 8 of 42
==39172==    at 0x1000AC2FE: malloc_zone_malloc (in /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==39172==    by 0x100757A80: NXCreateHashTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100757A50: NXCreateHashTable (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100757950: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007578FA: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007563CB: __sel_registerName(char const*, int, int) (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007560DA: sel_init (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007559AD: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007687DA: objc_object::sidetable_retainCount() (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100007C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==39172==    by 0x100007E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==39172==    by 0x10022171D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==39172== 
==39172== 32 bytes in 1 blocks are still reachable in loss record 9 of 42
==39172==    at 0x1000AC2FE: malloc_zone_malloc (in /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==39172==    by 0x100757AA1: NXCreateHashTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100757A50: NXCreateHashTable (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100757950: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007578FA: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007563CB: __sel_registerName(char const*, int, int) (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007560DA: sel_init (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007559AD: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007687DA: objc_object::sidetable_retainCount() (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100007C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==39172==    by 0x100007E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==39172==    by 0x10022171D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==39172== 
==39172== 32 bytes in 1 blocks are still reachable in loss record 10 of 42
==39172==    at 0x1000AC086: malloc (in /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==39172==    by 0x100757B65: NXCreateHashTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100757A50: NXCreateHashTable (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100757950: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007578FA: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007563CB: __sel_registerName(char const*, int, int) (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007560DA: sel_init (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007559AD: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007687DA: objc_object::sidetable_retainCount() (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100007C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==39172==    by 0x100007E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==39172==    by 0x10022171D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==39172== 
==39172== 32 bytes in 1 blocks are still reachable in loss record 11 of 42
==39172==    at 0x1000AC086: malloc (in /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==39172==    by 0x1007579B6: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007578FA: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007563CB: __sel_registerName(char const*, int, int) (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007560DA: sel_init (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007559AD: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007687DA: objc_object::sidetable_retainCount() (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100007C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==39172==    by 0x100007E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==39172==    by 0x10022171D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==39172==    by 0x100755075: _objc_init (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1001ABB34: _os_object_init (in /usr/lib/system/libdispatch.dylib)
==39172== 
==39172== 48 bytes in 1 blocks are still reachable in loss record 15 of 42
==39172==    at 0x1000AC8AD: malloc_zone_calloc (in /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==39172==    by 0x100757F18: _NXHashRehashToCapacity (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100757E96: NXHashInsert (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100757B8F: NXCreateHashTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100757A50: NXCreateHashTable (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100757950: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007578FA: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007563CB: __sel_registerName(char const*, int, int) (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007560DA: sel_init (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007559AD: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007687DA: objc_object::sidetable_retainCount() (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100007C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==39172== 
==39172== 72 bytes in 3 blocks are possibly lost in loss record 26 of 42
==39172==    at 0x1000AC6EA: calloc (in /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==39172==    by 0x1007557E2: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1007687DA: objc_object::sidetable_retainCount() (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x100007C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==39172==    by 0x100007E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==39172==    by 0x10022171D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==39172==    by 0x100755075: _objc_init (in /usr/lib/libobjc.A.dylib)
==39172==    by 0x1001ABB34: _os_object_init (in /usr/lib/system/libdispatch.dylib)
==39172==    by 0x1001ABB1B: libdispatch_init (in /usr/lib/system/libdispatch.dylib)
==39172==    by 0x1000BA9C2: libSystem_initializer (in /usr/lib/libSystem.B.dylib)
==39172==    by 0x100019AC5: ImageLoaderMachO::doModInitFunctions(ImageLoader::LinkContext const&) (in /usr/lib/dyld)
==39172==    by 0x100019CF5: ImageLoaderMachO::doInitialization(ImageLoader::LinkContext const&) (in /usr/lib/dyld)
==39172== 
==39172== LEAK SUMMARY:
==39172==    definitely lost: 0 bytes in 0 blocks
==39172==    indirectly lost: 0 bytes in 0 blocks
==39172==      possibly lost: 72 bytes in 3 blocks
==39172==    still reachable: 200 bytes in 6 blocks
==39172==         suppressed: 18,034 bytes in 154 blocks
==39172== 
==39172== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 12 from 12)
--39172-- 
--39172-- used_suppression:      5 OSX1013:19-Leak /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/default.supp:924 suppressed: 8,792 bytes in 5 blocks
--39172-- used_suppression:      7 OSX1013:17-Leak /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/default.supp:906 suppressed: 3,744 bytes in 59 blocks
--39172-- used_suppression:      3 OSX1013:16-Leak /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/default.supp:897 suppressed: 3,200 bytes in 50 blocks
--39172-- used_suppression:     16 OSX1013:10-Leak /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/default.supp:839 suppressed: 2,178 bytes in 36 blocks
--39172-- used_suppression:      4 OSX1013:18-Leak /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/default.supp:915 suppressed: 120 bytes in 4 blocks
--39172-- used_suppression:      1 OSX1013:dyld-5 /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/default.supp:1283
--39172-- used_suppression:      2 OSX1013:dyld-4 /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/default.supp:1275
--39172-- used_suppression:      1 OSX1013:dyld-3 /usr/local/Cellar/valgrind/3.15.0/lib/valgrind/default.supp:1267
==39172== 
==39172== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 12 from 12)

Ответы [ 2 ]

4 голосов
/ 11 марта 2020

Строго говоря, это утечка: 

if(input_file_name_ptr == NULL){
        printf("Cannot allocate input_file_name_ptr\n");
        exit(1);
}

Должен быть записан как 

if(input_file_name_ptr == NULL){
        free(params);
        printf("Cannot allocate input_file_name_ptr\n");
        exit(1);
}

Может быть достаточно, чтобы вызвать предупреждение инструмента.

0 голосов
/ 11 марта 2020

Возможно потеря означает, что ваша программа утечка памяти, если вы не делаете необычные вещи с указателями, которые могут заставить их указывать на середину выделенного блока. Но valgrind не может сказать, является ли это ошибкой программирования или вы делаете это намеренно. Вот почему он предупреждает вас. Код beow исправит проблему: 

/ main.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "constant.h"

void set_up_parameters( parameters *params, int argc, char **argv )
{
    char *input_file_name_ptr;
    input_file_name_ptr = calloc((INPUT_CHAR_LEN + 1), sizeof(char));
    if(input_file_name_ptr == NULL){

        /* before exiting the process, we should free memory allocated for params */
        free(params);
        printf("Cannot allocate input_file_name_ptr\n");
        exit(1);
    }
    params->input_file_name = input_file_name_ptr;
}


int main(int argc, char *argv[])
{
    parameters *params_ptr;
    params_ptr = NULL;
    params_ptr = calloc(1, sizeof(parameters));
    if(params_ptr == NULL){
        printf("Cannot allocate parameters\n");
        exit(1);
    }

    set_up_parameters( params_ptr, argc, argv);

    free(params_ptr->input_file_name);
    free(params_ptr);
    return 0;
}
...