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Full Discussion: Data segment or Text segment
Top Forums Programming Data segment or Text segment Post 302519324 by shamrock on Tuesday 3rd of May 2011 05:07:13 PM
Old 05-03-2011
The rodata section is a specific section of the text segment set aside for storing constants and literals for the purpose of efficiency as they can be embedded in the instructions passed to the CPU and so no overhead is incurred to fetch them from memory. Another clue to the location of the literal is the fact that out of the 3 segments text data and stack only the text segment is readonly while data and stack are read and write and as i said before if still in doubt print out the value of a and the start of the data segment in gdb to see where the string literal actually lies.
gdb
 

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LEARN ABOUT OSF1

plock

plock(2)							System Calls Manual							  plock(2)

NAME

       plock -	Locks a process' text and/or data segments in memory

SYNOPSIS

       #include <sys/lock.h>
       int plock(      int opr) ;

PARAMETERS

       Specifies  one  of  the following operations: Locks the text and data segments into memory.  Locks the text segment into memory.  Locks the
       data segment into memory.  Removes locks.

DESCRIPTION

       The plock() function locks or unlocks a process' text segments, data segments, or both in physical memory.  When locked, the physical pages
       containing the text or data segment will not be paged out.  It is an error to lock a segment that is already locked.

       The caller must have superuser privilege to use the plock() function.

       Note  that  memory  acquired  subsequent  to  a	plock() function may or may not be locked in memory, depending on the specific acquisition
       method.	Memory acquired using the brk() function (or the sbrk() function) is locked if the data segment was locked.  Memory  acquired  via
       the mmap() or vm_allocate() functions will not be locked.

RETURN VALUES

       Upon successful completion, a value of 0 (zero) is returned to the calling process.  Otherwise, a value of -1 is returned and  errno is set
       to indicate the error.

ERRORS

       If the plock() function fails, errno may be set to one of the following values: The caller does not have appropriate privilege.	There  are
       insufficient  resources	to  perform  the  operation.   The  opr parameter is PROCLOCK, but the text segment or the data segment is already
       locked.	The opr parameter is TXTLOCK, but the text segment is already locked.  The opr parameter is  DATLOCK,  but  the  data  segment	is
       already locked.	The opr parameter is UNLOCK, but neither the text segment nor the data segment is locked.

RELATED INFORMATION

       Functions: brk(2), mmap(2) delim off

																	  plock(2)
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