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e28fbd787c
Because I actually managed to hit deadlock in libvirt's child process due to glibc's mutex use in user database lookup, I figured it is worth documenting the issue for others to be aware of when writing a privileged multithreaded parent app that spawns child processes owned by non-privileged ids. * doc/glibc-functions/initgroups.texi (initgroups): Mention multithread safety. * doc/posix-functions/getpwuid.texi (getpwuid): Likewise. * doc/posix-functions/getpwuid_r.texi (getpwuid_r): Likewise. * doc/glibc-functions/getgrouplist.texi (getgrouplist): Mention getugroups. * doc/posix-functions/getgroups.texi (getgroups): Mention multithread safety and mgetgroups. Signed-off-by: Eric Blake <eblake@redhat.com>
22 lines
561 B
Plaintext
22 lines
561 B
Plaintext
@node initgroups
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@subsection @code{initgroups}
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@findex initgroups
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Gnulib module: ---
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Portability problems fixed by Gnulib:
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@itemize
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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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This function is unsafe to call between @code{fork} and @code{exec} if
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the parent process is multi-threaded. Instead, use @code{getgroups} or
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@code{getgrouplist} (or use the gnulib module @code{mgetgroups})
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before forking, and @code{setgroups} in the child.
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@item
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This function is missing on some platforms:
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mingw, MSVC 9, Interix 3.5, BeOS.
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@end itemize
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