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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>
25 lines
702 B
Plaintext
25 lines
702 B
Plaintext
@node getpwuid_r
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@section @code{getpwuid_r}
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@findex getpwuid_r
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/getpwuid_r.html}
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Gnulib module: extensions
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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 has an incompatible declaration on some platforms:
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Solaris 11 2011-11 (when @code{_POSIX_PTHREAD_SEMANTICS} is not defined).
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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. Use it prior to forking.
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@item
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This function is missing on some platforms:
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OpenBSD 3.8, Minix 3.1.8, mingw, MSVC 9, BeOS.
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@end itemize
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