Improve input preprocessor failure diagnostics #328
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This fixes gwsw/less issue gwsw#327. * configure.ac: Check for sys/wait.h and for strsignal. * edit.c: Include <sys/wait.h> if available. (close_pipe): Always diagnose internal error with pclose. On POSIX-compatible systems, generate better diagnostics that distinguish between ordinary exit and signals, and do not diagnose SIGPIPE after the user types 'q' as that is normal and expected. * os.c (signal_message): New function.
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This fixes gwsw/less issue #327.
(close_pipe): Always diagnose internal error with pclose. On POSIX-compatible systems, generate better diagnostics that distinguish between ordinary exit and signals, and do not diagnose SIGPIPE after the user types 'q' as that is normal and expected.