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freebsd-dev/lib/libc/rpc/rpc_dtablesize.c

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Moving Sun RPC code into libc, part 1. Based on work done by a number of people, including J.T. Conklin, Theo de Raadt, Paul Richards, and probably someone else who's going to flame me as soon as they see this message.
1994-08-07 18:36:12 +00:00
/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
Remove trailing whitespace.
1995-05-30 05:51:47 +00:00
*
Moving Sun RPC code into libc, part 1. Based on work done by a number of people, including J.T. Conklin, Theo de Raadt, Paul Richards, and probably someone else who's going to flame me as soon as they see this message.
1994-08-07 18:36:12 +00:00
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
Remove trailing whitespace.
1995-05-30 05:51:47 +00:00
*
Moving Sun RPC code into libc, part 1. Based on work done by a number of people, including J.T. Conklin, Theo de Raadt, Paul Richards, and probably someone else who's going to flame me as soon as they see this message.
1994-08-07 18:36:12 +00:00
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
Remove trailing whitespace.
1995-05-30 05:51:47 +00:00
*
Moving Sun RPC code into libc, part 1. Based on work done by a number of people, including J.T. Conklin, Theo de Raadt, Paul Richards, and probably someone else who's going to flame me as soon as they see this message.
1994-08-07 18:36:12 +00:00
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
Remove trailing whitespace.
1995-05-30 05:51:47 +00:00
*
Moving Sun RPC code into libc, part 1. Based on work done by a number of people, including J.T. Conklin, Theo de Raadt, Paul Richards, and probably someone else who's going to flame me as soon as they see this message.
1994-08-07 18:36:12 +00:00
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
Remove trailing whitespace.
1995-05-30 05:51:47 +00:00
*
Moving Sun RPC code into libc, part 1. Based on work done by a number of people, including J.T. Conklin, Theo de Raadt, Paul Richards, and probably someone else who's going to flame me as soon as they see this message.
1994-08-07 18:36:12 +00:00
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)rpc_dtablesize.c 1.2 87/08/11 Copyr 1987 Sun Micro";*/
/*static char *sccsid = "from: @(#)rpc_dtablesize.c 2.1 88/07/29 4.0 RPCSRC";*/
Resolve conflicts. This concludes tonight's entertainment. Once I'm sure I haven't destroyed the world with all these changes, I'll import the utilities. Everything should continue to work as before. If it doesn't let me know. Special thanks to Mark Murray for running a test 'make world' for me to shake out the bugs, which, hopefully, I have fixed. (And there was much rejoicing.)
1997-05-28 05:05:31 +00:00
static char *rcsid = "$Id: rpc_dtablesize.c,v 1.6 1996/12/30 18:41:20 peter Exp $";
Moving Sun RPC code into libc, part 1. Based on work done by a number of people, including J.T. Conklin, Theo de Raadt, Paul Richards, and probably someone else who's going to flame me as soon as they see this message.
1994-08-07 18:36:12 +00:00
#endif
'Fix' for esoteric misfeature discovered while searching for another bug: select() returns EINVAL if you try to feed it a value of FD_SETSIZE greater that 256. You can apparently adjust this by specifying a larger value of FD_SETSIZE when configuring your kernel. However, if you set the maximum number of open file descriptors per process to some value greater than the FD_SETSIZE value that select() expects, many selects() within the RPC library code will be botched because _rpc_dtablesize() will return invalid numbers. This is to say that it will return the upper descriptor table size limit which can be much higher than 256. Unless select() is prepared to expect this 'unusually' high value, it will fail. (A good example of this can be seen with NIS enabled: if you type 'unlimit' at the shell prompt and then run any command that does NIS calls, you'll be bombarded with errors from clnttcp_create().) A temporary fix for this is to clamp the value returned by _rpc_dtablesize() at FD_SETSIZE (as defined in <sys/types.h> (256)). I suppose the Right Thing would be to provide some mechanism for select() to dynamically adjust itself to handle FD_SETSIZE values larger than 256, but it's a bit late in the game for that. Hopefully 256 file descriptors will be enough to keep RPC happy for now.
1995-04-04 05:53:22 +00:00
#include <sys/types.h>
Code cleanup: 1. Added missing function prototypes. 2. Added missing function return types. 3. Added missing function argument types. 4. Added missing headers for system function prototypes. 5. Corrected format specifier in printf(). 6. Added extra parentheses around assignment used as truth value. 7. Added missing "default" cases in switch statements. 8. Added casts for function pointers. 9. Did *not* change int declarations of uid and gid to uid_t/gid_t because I don't know if that would affect the protocol. Put in explicit casts to int instead, to make things more obvious. 10. Moved declarations of variables that are only used if YP is defined inside the '#ifdef YP' conditionals.
1996-06-10 20:13:09 +00:00
#include <unistd.h>
'Fix' for esoteric misfeature discovered while searching for another bug: select() returns EINVAL if you try to feed it a value of FD_SETSIZE greater that 256. You can apparently adjust this by specifying a larger value of FD_SETSIZE when configuring your kernel. However, if you set the maximum number of open file descriptors per process to some value greater than the FD_SETSIZE value that select() expects, many selects() within the RPC library code will be botched because _rpc_dtablesize() will return invalid numbers. This is to say that it will return the upper descriptor table size limit which can be much higher than 256. Unless select() is prepared to expect this 'unusually' high value, it will fail. (A good example of this can be seen with NIS enabled: if you type 'unlimit' at the shell prompt and then run any command that does NIS calls, you'll be bombarded with errors from clnttcp_create().) A temporary fix for this is to clamp the value returned by _rpc_dtablesize() at FD_SETSIZE (as defined in <sys/types.h> (256)). I suppose the Right Thing would be to provide some mechanism for select() to dynamically adjust itself to handle FD_SETSIZE values larger than 256, but it's a bit late in the game for that. Hopefully 256 file descriptors will be enough to keep RPC happy for now.
1995-04-04 05:53:22 +00:00
Moving Sun RPC code into libc, part 1. Based on work done by a number of people, including J.T. Conklin, Theo de Raadt, Paul Richards, and probably someone else who's going to flame me as soon as they see this message.
1994-08-07 18:36:12 +00:00
/*
* Cache the result of getdtablesize(), so we don't have to do an
* expensive system call every time.
*/
Oops! Bad Idea! (TM) Restore the clamp on the return value from rpc_dtablesize().. Some programs (eg: ypserv) use this as an indication of how large svc_fdset is in their hand-rolled svc_run() loops. The svc_fdset table is maintained by the rpc library explicitly for compatability with such programs. (It uses a different variable-sized bitmap itself internally)
1996-12-30 18:41:20 +00:00
/*
* XXX In FreeBSD 2.x, you can have the maximum number of open file
* descriptors be greater than FD_SETSIZE (which us 256 by default).
*
* Since old programs tend to use this call to determine the first arg
* for select(), having this return > FD_SETSIZE is a Bad Idea(TM)!
*/
Remove our code that clamped the max select() fd number to FD_SETSIZE (256) This function is now unused.
1996-12-30 14:59:12 +00:00
int
Oops! Bad Idea! (TM) Restore the clamp on the return value from rpc_dtablesize().. Some programs (eg: ypserv) use this as an indication of how large svc_fdset is in their hand-rolled svc_run() loops. The svc_fdset table is maintained by the rpc library explicitly for compatability with such programs. (It uses a different variable-sized bitmap itself internally)
1996-12-30 18:41:20 +00:00
_rpc_dtablesize(void)
Moving Sun RPC code into libc, part 1. Based on work done by a number of people, including J.T. Conklin, Theo de Raadt, Paul Richards, and probably someone else who's going to flame me as soon as they see this message.
1994-08-07 18:36:12 +00:00
{
static int size;
Remove trailing whitespace.
1995-05-30 05:51:47 +00:00
Oops! Bad Idea! (TM) Restore the clamp on the return value from rpc_dtablesize().. Some programs (eg: ypserv) use this as an indication of how large svc_fdset is in their hand-rolled svc_run() loops. The svc_fdset table is maintained by the rpc library explicitly for compatability with such programs. (It uses a different variable-sized bitmap itself internally)
1996-12-30 18:41:20 +00:00
if (size == 0) {
Moving Sun RPC code into libc, part 1. Based on work done by a number of people, including J.T. Conklin, Theo de Raadt, Paul Richards, and probably someone else who's going to flame me as soon as they see this message.
1994-08-07 18:36:12 +00:00
size = getdtablesize();
Oops! Bad Idea! (TM) Restore the clamp on the return value from rpc_dtablesize().. Some programs (eg: ypserv) use this as an indication of how large svc_fdset is in their hand-rolled svc_run() loops. The svc_fdset table is maintained by the rpc library explicitly for compatability with such programs. (It uses a different variable-sized bitmap itself internally)
1996-12-30 18:41:20 +00:00
if (size > FD_SETSIZE)
size = FD_SETSIZE;
}
Moving Sun RPC code into libc, part 1. Based on work done by a number of people, including J.T. Conklin, Theo de Raadt, Paul Richards, and probably someone else who's going to flame me as soon as they see this message.
1994-08-07 18:36:12 +00:00
return (size);
}
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