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Valgrind: Difference between revisions
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=Valgrind= | =Valgrind= | ||
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==== Memory leak ==== | ==== Memory leak ==== | ||
The error message for a memory leak will be given at the end of the program execution, and will look like this : | The error message for a memory leak will be given at the end of the program execution, and will look like this : | ||
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<syntaxhighlight lang=text> | <syntaxhighlight lang=text> | ||
==2116== 100 bytes in 1 blocks are definitely lost in loss record 1 of 1 | ==2116== 100 bytes in 1 blocks are definitely lost in loss record 1 of 1 | ||
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==2116== by 0x804840F: main (in /home/cprogram/example1) | ==2116== by 0x804840F: main (in /home/cprogram/example1) | ||
</syntaxhighlight> | </syntaxhighlight> | ||
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==== Invalid pointer access/out of bound errors ==== | ==== Invalid pointer access/out of bound errors ==== | ||
If you attempt to read or write to an unallocated pointer or outside of the allocated memory, the error message will look like this: | If you attempt to read or write to an unallocated pointer or outside of the allocated memory, the error message will look like this: | ||
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<syntaxhighlight lang=text> | <syntaxhighlight lang=text> | ||
==9814== Invalid write of size 1 | ==9814== Invalid write of size 1 | ||
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==9814== by 0x804840F: main (example2.c:5) | ==9814== by 0x804840F: main (example2.c:5) | ||
</syntaxhighlight> | </syntaxhighlight> | ||
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==== Usage of uninitialized variables ==== | ==== Usage of uninitialized variables ==== | ||
If you use an uninitialized variable, you will get an error message such as | If you use an uninitialized variable, you will get an error message such as | ||
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<syntaxhighlight lang=text> | <syntaxhighlight lang=text> | ||
==17943== Conditional jump or move depends on uninitialised value(s) | ==17943== Conditional jump or move depends on uninitialised value(s) | ||
==17943== at 0x804840A: main (example3.c:6) | ==17943== at 0x804840A: main (example3.c:6) | ||
</syntaxhighlight> | </syntaxhighlight> | ||