m4/unlocked-io.m4

   1 #serial 7 -*- autoconf -*-
   2
   3 dnl From Jim Meyering.
   4 dnl
   5 dnl See if the glibc *_unlocked I/O macros or functions are available.
   6 dnl Use only those *_unlocked macros or functions that are declared
   7 dnl (because some of them were declared in Solaris 2.5.1 but were removed
   8 dnl in Solaris 2.6, whereas we want binaries built on Solaris 2.5.1 to run
   9 dnl on Solaris 2.6).
  10
  11 AC_DEFUN([jm_FUNC_GLIBC_UNLOCKED_IO],
  12 [
  13   dnl Persuade glibc <stdio.h> to declare fgets_unlocked(), fputs_unlocked()
  14   dnl etc.
  15   AC_REQUIRE([AC_GNU_SOURCE])
  16
  17   AC_CHECK_DECLS_ONCE(
  18      [clearerr_unlocked feof_unlocked ferror_unlocked
  19       fflush_unlocked fgets_unlocked fputc_unlocked fputs_unlocked
  20       fread_unlocked fwrite_unlocked getc_unlocked
  21       getchar_unlocked putc_unlocked putchar_unlocked])
  22 ])