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gawk: Other Environment Variables

 
 2.5.3 Other Environment Variables
 ---------------------------------
 
 A number of other environment variables affect 'gawk''s behavior, but
 they are more specialized.  Those in the following list are meant to be
 used by regular users:
 
 'GAWK_MSEC_SLEEP'
      Specifies the interval between connection retries, in milliseconds.
      On systems that do not support the 'usleep()' system call, the
      value is rounded up to an integral number of seconds.
 
 'GAWK_READ_TIMEOUT'
      Specifies the time, in milliseconds, for 'gawk' to wait for input
      before returning with an error.  ⇒Read Timeout.
 
 'GAWK_SOCK_RETRIES'
      Controls the number of times 'gawk' attempts to retry a two-way
DONTPRINTYET       TCP/IP (socket) connection before giving up.  ⇒TCP/IP
      Networking.  Note that when nonfatal I/O is enabled (*noteDONTPRINTYET       TCP/IP (socket) connection before giving up.  ⇒TCP/IP
      Networking.  Note that when nonfatal I/O is enabled (⇒
      Nonfatal), 'gawk' only tries to open a TCP/IP socket once.
 
 'POSIXLY_CORRECT'
      Causes 'gawk' to switch to POSIX-compatibility mode, disabling all
      traditional and GNU extensions.  ⇒Options.
 
    The environment variables in the following list are meant for use by
 the 'gawk' developers for testing and tuning.  They are subject to
 change.  The variables are:
 
 'AWKBUFSIZE'
      This variable only affects 'gawk' on POSIX-compliant systems.  With
      a value of 'exact', 'gawk' uses the size of each input file as the
      size of the memory buffer to allocate for I/O. Otherwise, the value
      should be a number, and 'gawk' uses that number as the size of the
      buffer to allocate.  (When this variable is not set, 'gawk' uses
      the smaller of the file's size and the "default" blocksize, which
      is usually the filesystem's I/O blocksize.)
 
 'AWK_HASH'
      If this variable exists with a value of 'gst', 'gawk' switches to
      using the hash function from GNU Smalltalk for managing arrays.
      This function may be marginally faster than the standard function.
 
 'AWKREADFUNC'
      If this variable exists, 'gawk' switches to reading source files
      one line at a time, instead of reading in blocks.  This exists for
      debugging problems on filesystems on non-POSIX operating systems
      where I/O is performed in records, not in blocks.
 
 'GAWK_MSG_SRC'
      If this variable exists, 'gawk' includes the file name and line
      number within the 'gawk' source code from which warning and/or
      fatal messages are generated.  Its purpose is to help isolate the
      source of a message, as there are multiple places that produce the
      same warning or error message.
 
 'GAWK_LOCALE_DIR'
      Specifies the location of compiled message object files for 'gawk'
      itself.  This is passed to the 'bindtextdomain()' function when
      'gawk' starts up.
 
 'GAWK_NO_DFA'
      If this variable exists, 'gawk' does not use the DFA regexp matcher
      for "does it match" kinds of tests.  This can cause 'gawk' to be
      slower.  Its purpose is to help isolate differences between the two
      regexp matchers that 'gawk' uses internally.  (There aren't
      supposed to be differences, but occasionally theory and practice
      don't coordinate with each other.)
 
 'GAWK_STACKSIZE'
      This specifies the amount by which 'gawk' should grow its internal
      evaluation stack, when needed.
 
 'INT_CHAIN_MAX'
      This specifies intended maximum number of items 'gawk' will
      maintain on a hash chain for managing arrays indexed by integers.
 
 'STR_CHAIN_MAX'
      This specifies intended maximum number of items 'gawk' will
      maintain on a hash chain for managing arrays indexed by strings.
 
 'TIDYMEM'
      If this variable exists, 'gawk' uses the 'mtrace()' library calls
      from the GNU C library to help track down possible memory leaks.
 
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