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Bug 13575 reports that SSIZE_MAX is wrongly defined as LONG_MAX on 32-bit systems where ssize_t is defined as int (which is most 32-bit systems supported by glibc). This patch fixes the definition, using a conditional on __WORDSIZE32_SIZE_ULONG to determine the appropriate type in the 32-bit case. Formally ssize_t need not be the signed type corresponding to size_t, but as it is for all current glibc configurations, there is no need for a new macro different from the one used for defining SIZE_MAX. A testcase is added for both the type and the value of SSIZE_MAX. There is a relevant peculiarity in sysdeps/unix/sysv/linux/s390/bits/typesizes.h: /* Compatibility with g++ 2.95.x. */ /* size_t is unsigned long int on s390 -m31. */ This has the effect that for GCC 2 for s390, ssize_t does not match __WORDSIZE32_SIZE_ULONG. I don't think such a conditional on the GCC version makes sense - to have a well-defined ABI, the choices of standard types should not depend on the GCC version. It's also the case that upstream GCC 2.95 did not support s390, and glibc headers don't in general try to support past development GCC versions - only actual releases and current mainline development. But whether or not that GCC 2 case should be removed (with or without a NEWS entry for such a change), this patch does not result in any changes for s390; the value is always still LONG_MAX in the s390 case because __WORDSIZE32_SIZE_ULONG is always defined for 32-bit s390. I don't think any such oddity in code only active for unofficial or unreleased old compiler versions should block closing the present bug as fixed once this patch is in. Tested for x86_64 and x86, and with build-many-glibcs.py. [BZ #13575] * posix/bits/posix1_lim.h: Include <bits/wordsize.h>. [!SSIZE_MAX && !(__WORDSIZE == 64 || __WORDSIZE32_SIZE_ULONG)] (SSIZE_MAX): Define to INT_MAX. * posix/test-ssize-max.c: New file. * posix/Makefile (tests): Add test-ssize-max. |
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This directory contains the sources of the GNU C Library. See the file "version.h" for what release version you have. The GNU C Library is the standard system C library for all GNU systems, and is an important part of what makes up a GNU system. It provides the system API for all programs written in C and C-compatible languages such as C++ and Objective C; the runtime facilities of other programming languages use the C library to access the underlying operating system. In GNU/Linux systems, the C library works with the Linux kernel to implement the operating system behavior seen by user applications. In GNU/Hurd systems, it works with a microkernel and Hurd servers. The GNU C Library implements much of the POSIX.1 functionality in the GNU/Hurd system, using configurations i[4567]86-*-gnu. The current GNU/Hurd support requires out-of-tree patches that will eventually be incorporated into an official GNU C Library release. When working with Linux kernels, this version of the GNU C Library requires Linux kernel version 3.2 or later. Also note that the shared version of the libgcc_s library must be installed for the pthread library to work correctly. The GNU C Library supports these configurations for using Linux kernels: aarch64*-*-linux-gnu alpha*-*-linux-gnu arm-*-linux-gnueabi hppa-*-linux-gnu i[4567]86-*-linux-gnu x86_64-*-linux-gnu Can build either x86_64 or x32 ia64-*-linux-gnu m68k-*-linux-gnu microblaze*-*-linux-gnu mips-*-linux-gnu mips64-*-linux-gnu powerpc-*-linux-gnu Hardware or software floating point, BE only. powerpc64*-*-linux-gnu Big-endian and little-endian. s390-*-linux-gnu s390x-*-linux-gnu riscv64-*-linux-gnu sh[34]-*-linux-gnu sparc*-*-linux-gnu sparc64*-*-linux-gnu tilegx-*-linux-gnu If you are interested in doing a port, please contact the glibc maintainers; see http://www.gnu.org/software/libc/ for more information. See the file INSTALL to find out how to configure, build, and install the GNU C Library. You might also consider reading the WWW pages for the C library at http://www.gnu.org/software/libc/. The GNU C Library is (almost) completely documented by the Texinfo manual found in the `manual/' subdirectory. The manual is still being updated and contains some known errors and omissions; we regret that we do not have the resources to work on the manual as much as we would like. For corrections to the manual, please file a bug in the `manual' component, following the bug-reporting instructions below. Please be sure to check the manual in the current development sources to see if your problem has already been corrected. Please see http://www.gnu.org/software/libc/bugs.html for bug reporting information. We are now using the Bugzilla system to track all bug reports. This web page gives detailed information on how to report bugs properly. The GNU C Library is free software. See the file COPYING.LIB for copying conditions, and LICENSES for notices about a few contributions that require these additional notices to be distributed. License copyright years may be listed using range notation, e.g., 1996-2015, indicating that every year in the range, inclusive, is a copyrightable year that would otherwise be listed individually.