I'm new to c
int main(int argc,char *argv[]) {
char *p[1234567] = { NULL };
return 1;
}
gives Segmentation fault
if I change to 12345, it will work.
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Sato
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There are actually several candidates for duplicates. – jxh Sep 01 '17 at 05:08
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A specific solution here is to move the variable to the static memory area just before main. That area is usually much larger than the stack. – Bo Persson Sep 01 '17 at 11:29
2 Answers
2
Thats most likely because your stack dont have 1234567 * sizeof(char *) bytes of space as needed by variable p
Pras
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An array of 1234567 pointers will be more than 4MB. That is larger than the stack capacity for a thread on many systems. For example, if I recall correctly, on Win32 the address space reserved for a thread's stack defaults to 1MB.
Michael Burr
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@roottraveller [here is a link](https://stackoverflow.com/a/45993484/1505939) – M.M Sep 01 '17 at 05:02
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@roottraveller https://msdn.microsoft.com/en-us/library/windows/desktop/ms686774(v=vs.85).aspx – harper Sep 01 '17 at 05:04
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@Sato, of course, the 1,234,567 pointers containing `NULL` need some storage. Otherwise what do you think, you initialized with `={NULL}`? – Gerhardh Sep 01 '17 at 07:43