Date: Wed, 18 Oct 1995 17:02:03 -0400 From: "Garrett A. Wollman" <wollman@lcs.mit.edu> To: Terry Lambert <terry@lambert.org> Cc: bde@zeta.org.au (Bruce Evans), bakul@netcom.com, current@freefall.freebsd.org, hackers@freefall.freebsd.org Subject: Re: getdtablesize() broken? Message-ID: <9510182102.AA05903@halloran-eldar.lcs.mit.edu> In-Reply-To: <199510181939.MAA00690@phaeton.artisoft.com> References: <199510180704.RAA16305@godzilla.zeta.org.au> <199510181939.MAA00690@phaeton.artisoft.com>
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<<On Wed, 18 Oct 1995 12:39:49 -0700 (MST), Terry Lambert <terry@lambert.org> said: > ] #define ARG_MAX 65536 /* max bytes for an exec function */ > Type: Bogus. Type: POSIX. > Required by: The process environment being in the user's address > space instead of attached to the proc structure and > accessed through system calls. BZZZZT! Wrong, but thanks for playing. You can ask David or John about the memory-fragmentation issues which mandate the use of a separate VM submap to hold this data while it is being staged between the old process and the new process. > ] #define CHILD_MAX 40 /* max simultaneous processes */ > Type: Administrative (compile time override) Type: Bogus but POSIX. > Required by: The ability for a user program to fork(2) the system to > death. BZZZZT! This value should be modifiable at run time. (It isn't yet.) > ] #define LINK_MAX 32767 /* max file link count */ > Type: Pragmatic Type: POSIX. > ] #define MAX_CANON 255 /* max bytes in term canon input line */ > Type: Bogus Type: POSIX. > ] #define NGROUPS_MAX 16 /* max supplemental group id's */ > Type: Standard (Interoperability, Legacy) > Required by: NFS, YP > Reason: Excess groups are truncated by the NFS external ID > representation mechanism. In point of fact, this > limit should be 8 to ensure interoperability with > older SVR3/SVR4 systems. No, the NFS and RPC code have their own kluges to deal with broken systems. > ] #define OPEN_MAX 64 /* max open files per process */ > Type: Bogus Type: POSIX. > ] #define PIPE_BUF 512 /* max bytes for atomic pipe writes */ > Type: Bogus Type: POSIX. > ] #define BC_BASE_MAX 99 /* max ibase/obase values in bc(1) */ > ] #define BC_DIM_MAX 2048 /* max array elements in bc(1) */ > ] #define BC_SCALE_MAX 99 /* max scale value in bc(1) */ > ] #define BC_STRING_MAX 1000 /* max const string length in bc(1) */ > ] #define COLL_WEIGHTS_MAX 0 /* max weights for order keyword */ > ] #define EXPR_NEST_MAX 32 /* max expressions nested in expr(1) */ > ] #define LINE_MAX 2048 /* max bytes in an input line */ > ] #define RE_DUP_MAX 255 /* max RE's in interval notation */ > Type: Bogus Type: POSIX. > Required by: A user space program Required by: IEEE-CS technical committee P1003.1. Any user-space program that executes `bc' to do arithmetic, or uses the LC_COLLATE localization support, or executes `expr' to do arithmetic. -GAWollman -- Garrett A. Wollman | Shashish is simple, it's discreet, it's brief. ... wollman@lcs.mit.edu | Shashish is the bonding of hearts in spite of distance. Opinions not those of| It is a bond more powerful than absence. We like people MIT, LCS, ANA, or NSA| who like Shashish. - Claude McKenzie + Florent Vollant
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