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* lib/popen.c: On native Windows, use the _popen based code even if HAVE_POPEN is set. * doc/posix-functions/popen.texi: Mention necessity of COMSPEC environment variable on native Windows.
31 lines
868 B
Plaintext
31 lines
868 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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On native Windows platforms, this functions terminates the current process
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with exit code 127 if the environment variable @code{COMSPEC} is not set.
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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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