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* configure.in: AC_CHECK_FUNCS: add "system". * simpos.c (scm_system): always define: use sysmissing if not available. Check for HAVE_SYSTEM instead of _Windows (does Windows lack system or does it have an unusable one?). Check for error conditions -1 and 127. Use SCM_DEFER_INTS. Let the argument be optional: if not supplied, call system(NULL). * ports.c (scm_close_port): relax the type check from OPPORTP to PORTP; closing a closed port is allowed. |
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