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* lib/unistd.in.h (write): Enable replacement also if GNULIB_UNISTD_H_NONBLOCKING is 1. * lib/write.c: Enable replacement also if GNULIB_NONBLOCKING. (rpl_write): When failing to write on a non-blocking pipe, change errno from ENOSPC to EAGAIN. * lib/stdio.in.h (fprintf, fputc, fputs, fwrite, printf, putc, putchar, puts, vfprintf, vprintf): Enable replacement also if GNULIB_STDIO_H_NONBLOCKING is 1. * lib/stdio-write.c: Enable replacements also if GNULIB_NONBLOCKING. (CLEAR_ERRNO, HANDLE_ENOSPC): New macros. (CLEAR_LastError, HANDLE_ERROR_NO_DATA): New macros, extracted from CALL_WITH_SIGPIPE_EMULATION. (CALL_WITH_SIGPIPE_EMULATION): Use them. * m4/nonblocking.m4: New file. * m4/write.m4 (gl_FUNC_WRITE): Enable REPLACE_WRITE also if required for non-blocking I/O support. * m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Initialize GNULIB_UNISTD_H_NONBLOCKING. * m4/stdio_h.m4 (gl_STDIO_H): Enable REPLACE_STDIO_WRITE_FUNCS also if required for non-blocking I/O support. (gl_STDIO_H_DEFAULTS): Initialize GNULIB_STDIO_H_NONBLOCKING. * modules/nonblocking (Files): Add m4/nonblocking.m4, lib/stdio-write.c, m4/asm-underscore.m4. (Depends-on): Add stdio, unistd. (configure.ac): Invoke gl_NONBLOCKING_IO. Define GNULIB_NONBLOCKING. Set GNULIB_STDIO_H_NONBLOCKING, GNULIB_UNISTD_H_NONBLOCKING. * modules/unistd (Makefile.am): Substitute GNULIB_UNISTD_H_NONBLOCKING. * modules/stdio (Makefile.am): Substitute GNULIB_STDIO_H_NONBLOCKING. * doc/posix-functions/fprintf.texi: Mention 'nonblocking' module and problem with non-blocking pipes. * doc/posix-functions/fputc.texi: Likewise. * doc/posix-functions/fputs.texi: Likewise. * doc/posix-functions/fwrite.texi: Likewise. * doc/posix-functions/printf.texi: Likewise. * doc/posix-functions/putc.texi: Likewise. * doc/posix-functions/putchar.texi: Likewise. * doc/posix-functions/puts.texi: Likewise. * doc/posix-functions/vfprintf.texi: Likewise. * doc/posix-functions/vprintf.texi: Likewise. * doc/posix-functions/write.texi: Likewise.
32 lines
928 B
Plaintext
32 lines
928 B
Plaintext
@node fwrite
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@section @code{fwrite}
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@findex fwrite
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/fwrite.html}
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Gnulib module: stdio, nonblocking, sigpipe
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Portability problems fixed by Gnulib module @code{stdio}, together with module @code{nonblocking}:
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@itemize
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@item
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When writing to a non-blocking pipe whose buffer is full, this function fails
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with @code{errno} being set to @code{ENOSPC} instead of @code{EAGAIN} on some
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platforms:
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mingw.
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@end itemize
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Portability problems fixed by Gnulib module @code{stdio}, together with module @code{sigpipe}:
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@itemize
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@item
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When writing to a pipe with no readers, this function fails, instead of
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obeying the current @code{SIGPIPE} handler, on some platforms:
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mingw.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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On Windows platforms (excluding Cygwin), this function does not set @code{errno}
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upon failure.
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@end itemize
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