POSIX compliance... Post: 302976763

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Operating Systems OS X (Apple) POSIX compliance... Post 302976763 by Scrutinizer on Tuesday 5th of July 2016 11:16:14 PM

07-06-2016

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Hi Barry,

That looks quite neat and Posixy!

Some comments and ideas:

The sleep command is not used in a POSIX compliant ways, since it gets fed a float here, and in POSIX it can only handle integers. An alternative is maybe to fill the hourglass more or less from the start, depending on the number of minutes / seconds, and compensate the rest with the first sleep command.
Instead of using awk to cut the first 6 characters you could use "${platform%"${platform#??????}"}" or better yet, replace the if statements with one case statement and use it pattern matching capability CYGWIN*), so you do not need to cut the platform string.
The awk command substitutions in the 2nd for loop take time and will skew the time slightly. An alternative is to use parameter expansions or predefine the strings so that it does not add as much to the time used by the sleep commands..
Perhaps you could have a seconds countdown instead of the static number.
If more time is entered than what the hourglass can handle, graphically turn the hourglass (nice scripting challenge?)

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LEARN ABOUT OSX

sleep

SLEEP(3)						   BSD Library Functions Manual 						  SLEEP(3)

NAME

     sleep -- suspend thread execution for an interval measured in seconds

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     unsigned int
     sleep(unsigned int seconds);

DESCRIPTION

     The sleep() function suspends execution of the calling thread until either seconds seconds have elapsed or a signal is delivered to the
     thread and its action is to invoke a signal-catching function or to terminate the thread or process.  System activity may lengthen the sleep
     by an indeterminate amount.

     This function is implemented using nanosleep(2) by pausing for seconds seconds or until a signal occurs.  Consequently, in this implementa-
     tion, sleeping has no effect on the state of process timers, and there is no special handling for SIGALRM.

RETURN VALUES

     If the sleep() function returns because the requested time has elapsed, the value returned will be zero.  If the sleep() function returns due
     to the delivery of a signal, the value returned will be the unslept amount (the requested time minus the time actually slept) in seconds.

SEE ALSO

     nanosleep(2), usleep(3)

STANDARDS

     The sleep() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').

HISTORY

     A sleep() function appeared in Version 7 AT&T UNIX.

BSD
								 February 13, 1998							       BSD