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Full Discussion: memcpy error
Top Forums Programming memcpy error Post 302564759 by alister on Friday 14th of October 2011 02:12:00 PM
Old 10-14-2011
Quote:
Originally Posted by DreamWarrior
Why calloc? It zeros the memory and, as such, will touch every page allocated, forcing the kernel to actually create a physical page for it. This is wasteful, IMO, especially if you'll be writing to that memory again immediately (as he is) or, worse, if you'll be writing to the memory sparsely. Plus, I always thought that "calloc(x, y)" was pretty much equivalent to "malloc(x*y)" minus the obvious zeroing of the returned memory.
If x*y > SIZE_MAX, because of that overflow, malloc will silently attempt to allocate an amount of storage less than what was intended. This won't happen with a properly implemented calloc(x, y). If the overhead of zeroing the allocation is undesirable, then explicitly checking for overflow before using malloc would be wise.


Quote:
Originally Posted by DreamWarrior
I've never seen a malloc implementation return int
I have, but that was a while ago. These days, the case of the absent header, that you mentioned, is a much more likely scenario.

Regards,
Alister
Last edited by alister; 10-14-2011 at 03:18 PM..
 

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LEARN ABOUT SUNOS

install-solaris

install-solaris(1M)													       install-solaris(1M)

NAME

       install-solaris - install the Solaris operating system

SYNOPSIS

       install-solaris

       install-solaris	invokes  the  Solaris  Install	program. Depending on graphical capability and available memory at the time of invocation,
       install-solaris invokes either a text-based installer or a graphical installer.

       The following minimum requirements for physical memory dictate which features are available during installation:

       For SPARC machines:

       128 MB

	   Minimum physical memory for all installation types

       128 MB

	   Minimum physical memory required for windowing system

       384 MB

	   Minimum physical memory required for graphical-based installation

       For x86 machines:

       256 MB

	   Minimum physical memory for all installation types

       256 MB

	   Minimum physical memory required for windowing system

       512 MB

	   Minimum physical memory required for graphical-based installation

       In some cases, even if the minimum physical memory is present, available virtual memory after system startup can limit the number  of  fea-
       tures available.

       install-solaris	exists	only  on  the Solaris installation media (CD or DVD) and should be invoked only from there. Refer to the  for more
       details.

       install-solaris allows installation of the operating system onto any standalone system. install-solaris loads the software available on the
       installation media. Refer to the  for disk space requirements.

       Refer to the  for more information on the various menus and selections.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcdrom  (Solaris instal-  |
       |			     |lation media)		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

       pkginfo(1), install(1M), pkgadd(1M), attributes(5)

       It is advisable to exit install-solaris by means of the exit options in the install-solaris menus.

								    23 Sep 2005 					       install-solaris(1M)
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