valgrind

问题 This is my code: #include<stdio.h> #include<stdlib.h> #include<string.h> void main(int arge, char *argv[]) { FILE *f1; char ch,*fn="~/lyrics/"; strcat(fn,argv[1]); strcat(fn,".txt"); if( (f1 = fopen(fn,"r"))==NULL ) { printf("\nWrong filename\n%s not found",argv[1]); return; } while((ch=getw(f1))!=EOF) { printf("%c",ch); } } I compiled it using gcc -g -o file file.c and the compiler gave no error messages. But when I run it I get the error message: Segmentation fault (core dumped) Bad

问题 This is my code: #include<stdio.h> #include<stdlib.h> #include<string.h> void main(int arge, char *argv[]) { FILE *f1; char ch,*fn="~/lyrics/"; strcat(fn,argv[1]); strcat(fn,".txt"); if( (f1 = fopen(fn,"r"))==NULL ) { printf("\nWrong filename\n%s not found",argv[1]); return; } while((ch=getw(f1))!=EOF) { printf("%c",ch); } } I compiled it using gcc -g -o file file.c and the compiler gave no error messages. But when I run it I get the error message: Segmentation fault (core dumped) Bad

问题 This is my code: #include<stdio.h> #include<stdlib.h> #include<string.h> void main(int arge, char *argv[]) { FILE *f1; char ch,*fn="~/lyrics/"; strcat(fn,argv[1]); strcat(fn,".txt"); if( (f1 = fopen(fn,"r"))==NULL ) { printf("\nWrong filename\n%s not found",argv[1]); return; } while((ch=getw(f1))!=EOF) { printf("%c",ch); } } I compiled it using gcc -g -o file file.c and the compiler gave no error messages. But when I run it I get the error message: Segmentation fault (core dumped) Bad

问题 I want to write a CMakeLists.txt so that I can run my tests normally or with valgrind. I have seen much on integrating ctest with valgrind but all with the assumption that you want to set up a server to submit test results to a dart dashboard. I just want to run the tests on my machine and see the results on the command line. If I have to do a cmake -D VALGRIND=ON thats fine, but I'd rather generate tests named "foo" and "valgrind_foo" if possible. 回答1: I use valgrind for my memory check. To

问题 In my code I have a class named membrane with a function named exciteMod() , a function named decide() and a variable named delta_U . The first line of exciteMod() is this->delta_U = 0 . In decide() I have an exponent of -delta_U ( exp(-this->delta_U) ). which cause an error Use of uninitialised value of size 8. What might cause this? I don't have any error about delta_U which is generated in valgrind. Edit: Here are the relevant segment of the code: void membrane::exciteMod(){ this->delta_U

问题 In my code I have a class named membrane with a function named exciteMod() , a function named decide() and a variable named delta_U . The first line of exciteMod() is this->delta_U = 0 . In decide() I have an exponent of -delta_U ( exp(-this->delta_U) ). which cause an error Use of uninitialised value of size 8. What might cause this? I don't have any error about delta_U which is generated in valgrind. Edit: Here are the relevant segment of the code: void membrane::exciteMod(){ this->delta_U

问题 This question already has answers here : Malloc vs custom allocator: Malloc has a lot of overhead. Why? (3 answers) Closed 3 years ago . I found that malloc() allocates more memory spaces than I ask for. struct { void *ptr; int var; } msg; // 16 bytes (checked by sizeof()) for (int i = 0; i < 100000000; i++) malloc(sizeof(msg)); As the aforementioned code, malloc() actually allocate 32 bytes per function call (calculated by top ), but valgrind shows only 16 bytes per call indeed. Why does

问题 Today I installed valgrind on my Mac os x 10.6 and tried to test it out. And it turned out to be weird memory leaks in the system. What I did was just create simple c file that get some heap memory and immediately free it. When I ran valgrind it showed something like this Realfrees-MacBook-Pro:C Realfree$ valgrind --tool=memcheck --leak-check=yes --show-reachable=yes ./a.out ==2621== Memcheck, a memory error detector ==2621== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al. =

问题 Valgrind reports a memory leak when assigning a value to a string. I used the following simple code to test an memory leak reported by Valgrind. /****************************************** * FILE: t3.c * Compiled using : g++ -g t3.c -o t3 * * $ g++ -v * Reading specs from /usr/lib/gcc/i686-pc-linux-gnu/3.4.6/specs * Configured with: ./configure --prefix=/usr --infodir=/share/info --mandir=/share/man * --enable-languages=c,c++ --with-system-zlib --program-suffix=-3.4 --enable-threads=posix *

问题 While trying to create nested threads, helgrind reports several different types of data races. ==4429== Possible data race during write of size 8 at 0x5673830 by thread #13 ==4429== Locks held: none ==4429== at 0x4C379EF: memset (in /usr/lib/valgrind/vgpreload_helgrind-amd64-linux.so) ==4429== by 0x5060C85: get_cached_stack (allocatestack.c:250) ==4429== by 0x5060C85: allocate_stack (allocatestack.c:501) ==4429== by 0x5060C85: pthread_create@@GLIBC_2.2.5 (pthread_create.c:537) ==4429== by