This commit adds a new switch -a/--available that
appends a new column called 'available' to the
output. The column displays an estimation
of how much memory is available for starting
new applications, without swapping. Unlike the data
provided by the 'cached' or 'free' fields, this
field takes into account page cache and also that
not all reclaimable memory slabs will be reclaimed
due to items being in use.
For portabiliy, check for program_invocation_name during configure and
define HAVE_PROGRAM_INVOCATION_NAME accordingly. Use of this symbol is
now enclosed with the appropriate #ifdef block.
The symbol program_invocation_name is only used for error message
handling using error(), so it's safe to omit this if it is not
available.
If stream status is not checked at the end of execution below problem
would not report error, or non-zero exit code. The uptime is just an
example same was true with all commands of the project.
$ uptime >&- ; echo $?
uptime: write error: Bad file descriptor
1
$ uptime >/dev/full ; echo $?
uptime: write error: No space left on device
1
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
The strtol_or_err() already check argument is not larger than
LONG_MAX. This commit also removes clang warning.
free.c:262:55: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare]
if (args.repeat_counter < 1 || args.repeat_counter > ULONG_MAX/2)
~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
Bug-Debian: http://bugs.debian.org/654368
On systems with very large amonut of RAM when they use the -b or --bytes
option on free you get overflow and free shows a negative amount of
memory, which is obviously wrong.
The handling of the -c (count) option in free uses the standard string
handling and error utils. The program also checks for negative counts
and errors on these.
err and warn are BSD format but they are not recommended by library
developers. However their consiseness is useful!
The solution is to use some macros that create xerr etc which then
just map to the error() function. The next problem is error() uses
program_invocation_name so we set this to program_invovation_short_name
This is a global set but seems to be the convention (or at least errors
are on the short name only) used everywhere else.
Support long options, use program_invocation_short_name, print
version up on request, new giga & tera byte sizes switches, exit
when numeric arguments has garbage... and for rest see the diff.
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
