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From: "daniel.parkinson1 at gmail dot com" <sourceware-bugzilla@sourceware.org> To: gdb-prs@sourceware.org Subject: [Bug gdb/17676] New: gdb cannot print the address a pointer is pointing to returned by malloc Date: Wed, 03 Dec 2014 17:36:00 -0000 [thread overview] Message-ID: <bug-17676-4717@http.sourceware.org/bugzilla/> (raw) https://sourceware.org/bugzilla/show_bug.cgi?id=17676 Bug ID: 17676 Summary: gdb cannot print the address a pointer is pointing to returned by malloc Product: gdb Version: 7.7 Status: NEW Severity: normal Priority: P2 Component: gdb Assignee: unassigned at sourceware dot org Reporter: daniel.parkinson1 at gmail dot com Overview After making a call to malloc to assign a memory address to a pointer that is a parameter of the function, gdb will print 0x0 as the address pointed to. Steps to reproduce Compiling the following code... #include <stdio.h> #include <stdlib.h> #include <errno.h> #include <string.h> void create_stack(int *other_name_stack); int *stack; int main(void) { create_stack(stack); return 0; } void create_stack(int *other_name_stack) { other_name_stack = malloc(sizeof(int)*10); if(other_name_stack == NULL) printf("Malloc failed: %s\n", strerror(errno)); printf("%p\n", (void *)other_name_stack); } Command: gcc -O0 -Wall -g teststack.c -o teststack Command: gdb ./teststack break create_stack n p other_name_stack Actual results. p other_name_stack will always return 0x0, but the if statement will never return true. Expected results I would expect to be able to see the memory address returned by malloc. Build Date & Hardware Linux jim-vm-ubuntu 3.16.0-031600-generic #201408031935 SMP Sun Aug 3 23:56:17 UTC 2014 i686 i686 i686 GNU/Linux Additional Info GNU gdb (Ubuntu 7.7-0ubuntu3.1) 7.7 -- You are receiving this mail because: You are on the CC list for the bug.
next reply other threads:[~2014-12-03 17:36 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-12-03 17:36 daniel.parkinson1 at gmail dot com [this message] 2024-01-02 17:51 ` [Bug gdb/17676] " ssbssa at sourceware dot org
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