[SOLVED] Why am I receiving a SEGV signal (C)?

Why am I receiving a SEGV signal (C)?

Contextualizing, after compiling my code I'm receiving a SEGV signal, which is related to unauthorized access of memory. Given the source and that the code was working before recent changes. Why am I receiving this signal?

Note: Motif's type return explained

Returns a character pointer to the string value of the TextField widget. This returned value is a copy of the value of the XmNvalue resource. Returns an empty string if the length of the TextField widget’s string is 0 (zero).

Declaration:

char *str, *str1, *str2;

Previous initialization:

str2 = XmTextFieldGetString( WIDGET_WITH_STRING );

Current initialization:

str2[0] = "Group Definition";

Exception:

(dbx) cont      
dbx: warning: Resuming only t@1 to satisfy events that require
automatic single-stepping

trace:    814     if (!add_button_sensitive)
trace:    817     str = XmTextFieldGetString( region_code_text );
trace:    818     str1 = XmTextFieldGetString( region_name_text );
trace:    823     str2[0] = "Group Definition";
t@1 (l@1) signal SEGV (access to address exceeded protections) in      
region_add_mod_cb at line 823 in file "region_groups.c"
  823     str2[0] = "Group Definition";

Solution

str2 is not initialized at all in your code, so it can have any random value. And de-referencing it may cause segfault.

Also str2[0] is char while you are assigning it a 'char *' "Group Definition", which is not correct. You want str2 = "Group Definition"; ?