Mercurial > gnulib
view lib/sys-limits.h @ 40189:3ba41edecde6
progreloc: Speed up executable lookup on various platforms.
* lib/progreloc.c: Include <errno.h>.
(safe_read, full_read): New functions.
(find_executable): On GNU/kFreeBSD, FreeBSD, DragonFly, NetBSD, Solaris,
prefer the information from the /proc file system to a PATH search.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Tue, 19 Feb 2019 21:42:54 +0100 |
parents | d9aa46720207 |
children |
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/* System call limits Copyright 2018-2019 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, see <https://www.gnu.org/licenses/>. */ #ifndef _GL_SYS_LIMITS_H #define _GL_SYS_LIMITS_H #include <limits.h> /* Maximum number of bytes to read or write in a single system call. This can be useful for system calls like sendfile on GNU/Linux, which do not handle more than MAX_RW_COUNT bytes correctly. The Linux kernel MAX_RW_COUNT is at least INT_MAX >> 20 << 20, where the 20 comes from the Hexagon port with 1 MiB pages; use that as an approximation, as the exact value may not be available to us. Using this also works around a serious Linux bug before 2.6.16; see <https://bugzilla.redhat.com/show_bug.cgi?id=612839>. Using this also works around a Tru64 5.1 bug, where attempting to read INT_MAX bytes fails with errno == EINVAL. See <https://lists.gnu.org/r/bug-gnu-utils/2002-04/msg00010.html>. Using this is likely to work around similar bugs in other operating systems. */ enum { SYS_BUFSIZE_MAX = INT_MAX >> 20 << 20 }; #endif