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Full Discussion: String - Segmentation Fault
Top Forums Programming String - Segmentation Fault Post 302736477 by Corona688 on Tuesday 27th of November 2012 10:45:38 AM
Old 11-27-2012
Quote:
Originally Posted by Raj 89
I have a problem with this code. I am using a gcc compiler and when i compile and execute this code i am getting a seg fault. I am just assigning two variables, name_1 as pointer and name_2 as string.
Yes, see, they're both pointers as far as the computer's concerned.

name_2 ends up being a pointer that points to 20 bytes of memory that can hold a string.

name_1 is a pointer that points nowhere in particular at all, and odds are good it will end up pointing at invalid memory.

Setting it to NULL will guarantee it points to invalid memory.

C doesn't give you memory unless you ask for it.
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aliases(4)						     Kernel Interfaces Manual							aliases(4)

NAME
aliases - Contains alias definitions for the sendmail program SYNOPSIS
/var/adm/sendmail/aliases DESCRIPTION
By default, the aliases file contains the required aliases for the sendmail program. Do not delete these defaults because they are needed by the system. This file describes user ID aliases used by the sendmail command. It is formatted as a series of lines in the form: name: name_1, name_2, name_3,.. The name is the name that needs an alias, and the name_n are the aliases for that name. Lines beginning with white space are continuation lines. Lines beginning with a # (number sign) are comments. You can define an alias only on local names. Duplicate addresses are removed and no message is sent to any person more than once. For example, if name_1 defines an alias that is name_2 and name_2 defines an alias that is name_1, sendmail does not send the same message back and forth. Local and valid recipients who have a .forward file in their home directory have messages forwarded to the list of users defined in that file. This is only the raw data file; the actual information that defines the aliases is placed into a binary format in the files /var/adm/send- mail/aliases.dir and /var/adm/sendmail/aliases.pag using the newaliases command. For the change to take effect, the newaliases command must be executed each time the aliases file is changed. The sendmail program also supports sending messages to programs or appending a message to a file. See the sendmail(8) reference page for further information. Special Aliases Directs error messages that occur when sending to aliasname back to address. RESTRICTIONS
Aliases for sendmail use the dbm(3) database format for faster lookups. A single alias cannot exceed 1,000 characters. To work around this restriction, you can chain together aliases. For example: alias-list: ali1, ali2, ali3 ali1: name 1, name 2 ... ali2: name n, name n + 1 FILES
Binary aliases file. Binary aliases file. RELATED INFORMATION
Commands: newaliases(1), forward(4), local.users(4), sendmail(8) delim off aliases(4)
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