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Full Discussion: Problem in Awk
Top Forums Shell Programming and Scripting Problem in Awk Post 33625 by rajugp1 on Monday 13th of January 2003 07:34:18 AM
Old 01-13-2003
Actually, when the query does not return anything , the script execution enters a pause state.

Suppose if i had just the code like
-------------------------------------
while (command | getline)
{
print "reached this point"
}

print "reached after while"
-------------------------------------

Since the command(query returned nothing), the script is expecting some input and waits indefinitely and does not even enter the loop and hence does not print "reached this point".Also, it neither prints "reached after while"

Instead, if i press "Enter" the script proceeds and prints "reached this point" .Also, it prints "reached after while"

I think getline expects something to be returned by command.And if command does not return anything, it hangs waiting until something is input by the user.

Does the control enter the loop irrespective of whether command returns anything or not?
 

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LEARN ABOUT HPUX

feholdexcept

feholdexcept(3M)														  feholdexcept(3M)

NAME

       feholdexcept() - save floating-point environment

SYNOPSIS

DESCRIPTION

       The  function  saves  the  current floating-point environment in the object pointed to by the argument envp.  This function also clears the
       floating-point exception flags and disables all traps.

       Use with to hide spurious floating-point exceptions.  Use it with to hide all floating-point exceptions.

USAGE

       To use this function, compile either with the default option or with the and options.  Make sure your program includes

       For HP Integrity servers, specify on the compiler command line or place the call to this  function  under  the  effect  of  an  affirmative
       pragma:

       If  the pragma is placed outside of any top-level declarations in a file, the pragma will apply to all declarations in the compilation fol-
       lowing the pragma until another pragma is encountered or until the end of the file is reached.

       If the pragma is placed at the beginning of a block (compound statement), the pragma will apply until  another  pragma  is  encountered	or
       until the end of the block is reached.

       For  PA-RISC, you might need to use the compiler option in order to prevent optimizations that can undermine the specified behavior of this
       function.

       Link in the math library by specifying on the compiler or linker command line.

       For more information, see the at the following site:

RETURN VALUE

       The function returns a zero value, indicating the successful disabling of any traps.

ERRORS

       No errors are defined.

EXAMPLES

       Store the current floating-point environment in hide spurious underflow exceptions, and continue  on  any  floating-point  exceptions  that
       occur until the call to is encountered.

SEE ALSO

       fegetenv(3M), fesetenv(3M), feupdateenv(3M), fenv(5).

STANDARDS CONFORMANCE

       : ISO/IEC C99 (including Annex F, "IEC 60559 floating-point arithmetic")

																  feholdexcept(3M)
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