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* lib/stdio.in.h (popen): Declare it if the system lacks this function. * lib/popen.c (popen): Provide alternate definition for native Windows. * m4/popen.m4 (gl_FUNC_POPEN): Test if popen exists. Set HAVE_POPEN. * m4/stdio_h.m4 (gl_STDIO_H_DEFAULTS): Initialize HAVE_POPEN. * modules/popen (Depends-on, configure.ac): Update condition. * modules/stdio (Makefile.am): Substitute HAVE_POPEN. * doc/posix-functions/popen.texi: Mention that the MSVC problem is fixed.
28 lines
713 B
Plaintext
28 lines
713 B
Plaintext
@node popen
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@section @code{popen}
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@findex popen
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/popen.html}
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Gnulib module: popen
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This function is missing on some platforms:
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MSVC 9.
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@item
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Some platforms start the child with closed stdin or stdout if the
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standard descriptors were closed in the parent:
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Cygwin 1.5.x.
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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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Some platforms mistakenly set the close-on-exec bit, then if it is
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cleared by the application, the platform then leaks file descriptors
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from earlier @code{popen} calls into subsequent @code{popen} children:
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Cygwin 1.5.x.
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@end itemize
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