Assume POSIX 1003.1-1988 or later for fcntl.h.
* admin/CPP-DEFINES (O_RDONLY, O_RDWR, HAVE_FCNTL_H): Remove. * admin/merge-gnulib (GNULIB_MODULES): Add fcntl-h. * configure.ac: Do not check for fcntl.h. * lib/gnulib.mk: Regenerate. * lib-src/movemail.c, lib-src/update-game-score.c: Assume <fcntl.h> exists. * nt/inc/sys/socket.h (O_NONBLOCK): Rename from O_NDELAY, since the POSIX name for this flag is O_NONBLOCK. All uses changed. * nt/inc/unistd.h (O_RDWR, O_NOCTTY): New macros. Like AT_FDCWD etc. these really should be moved to a replacement <fcntl.h> if and when that gets implemented. In the meantime, include <fcntl.h> to make sure we don't override its definitions. * src/callproc.c (relocate_fd): Assume F_DUPFD. * src/emacs.c, src/term.c (O_RDWR): Remove. * src/keyboard.c (tty_read_avail_input): Use O_NONBLOCK rather than O_NDELAY, since O_NONBLOCK is the standard name for this flag. * src/nsterm.m: Assume <fcntl.h> exists. * src/process.c (NON_BLOCKING_CONNECT, allocate_pty, create_process) (create_pty, Fmake_network_process, server_accept_connection) (wait_reading_process_output, init_process_emacs): Assume O_NONBLOCK. (wait_reading_process_output): Put in a special case for WINDOWSNT to mimick the older behavior where it had O_NDELAY but not O_NONBLOCK. It's not clear this is needed, but it's a more-conservative change. (create_process): Assume FD_CLOEXEC. (create_process, create_pty): Assume O_NOCTTY. * src/sysdep.c (init_sys_modes, reset_sys_modes): Assume F_SETFL. (reset_sys_modes): Use O_NONBLOCK rather than O_NDELAY. Omit if not DOS_NT, since F_GETFL is not defined there. (serial_open): Assume O_NONBLOCK and O_NOCTTY. * src/term.c: Include <fcntl.h>, for flags like O_NOCTTY. (O_NOCTTY): Remove. (init_tty): Assume O_IGNORE_CTTY is defined to 0 on platforms that lack it, since gnulib guarantees this. * src/w32.c (fcntl): Test for O_NONBLOCK rather than O_NDELAY. Fixes: debbugs:12881
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