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authorUlrich Drepper <drepper@redhat.com>1998-11-25 15:42:34 +0000
committerUlrich Drepper <drepper@redhat.com>1998-11-25 15:42:34 +0000
commit0155a7737f5653e07015421b962b70fd8831c4ad (patch)
tree48ce04644835332f6d81ed848d8ff68f6d3973c9 /FAQ.in
parente66b6eca3d51457a2348d4dd23638a7b339b9e03 (diff)
downloadglibc-0155a7737f5653e07015421b962b70fd8831c4ad.tar.gz
Update.
1998-11-25 Ulrich Drepper <drepper@cygnus.com> * version.h (VERSION): Bump to 2.0.104. 1998-11-25 Mark Kettenis <kettenis@phys.uva.nl> * libio/bits/stdio.h (fread_unlocked): Add missing parentheses around parameter n. 1998-11-24 Andreas Schwab <schwab@issan.cs.uni-dortmund.de> * time/tzfile.c (__tzfile_read): Fix comment. 1998-11-24 Andreas Schwab <schwab@issan.cs.uni-dortmund.de> * Makerules (build-shlib): Pass -O1 down to linker to get optimized shared libraries. 1998-11-24 Andreas Schwab <schwab@issan.cs.uni-dortmund.de> * Makeconfig ($(common-objpfx)sysd-dirs): Cope with no Subdirs file. Strip "-" from inhibited subdir name. Combine into a single awk program. ($(common-objpfx)sysd-sorted): Fix sed command.
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@@ -776,6 +776,33 @@ If you need nscd, you have to use a 2.1 kernel.
Note that I have at this point no information about any other platform.
+?? I need lots of open files. What do I have to do?
+
+{AJ} This is at first a kernel issue. The kernel defines limits with
+OPEN_MAX the number of simultaneous open files and with FD_SETSIZE the
+number of used file descriptors. You need to change these values in your
+kernel and recompile the kernel so that the kernel allows to use more open
+files. You don't necessarily need to recompile the GNU C library since the
+only place where OPEN_MAX and FD_SETSIZE is really needed in the library
+itself is the size of fd_set which is used by select.
+
+The GNU C library is now (nearly) select free. This means it internally has
+no limits imposed by the `fd_set' type. Instead almost all places where the
+functionality is needed the `poll' function is used.
+
+If you increase the number of file descriptors in the kernel you don't need
+to recompile the C library. The remaining select calls are in the RPC code.
+If your RPC daemons don't need more than FD_SETSIZE file descriptors, you
+don't need to change anything at all.
+
+{UD} You can always get the maximum number of file descriptors a process is
+allowed to have open at any time using
+
+ number = sysconf (_SC_OPEN_MAX);
+
+This will work even if the kernel limits change.
+
+
? Source and binary incompatibilities, and what to do about them
?? I expect GNU libc to be 100% source code compatible with