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2cc7bad0ae
C99 specifies that the EOF condition on a file is "sticky": once EOF has been encountered, all subsequent reads should continue to return EOF until the file is closed or something clears the "end-of-file indicator" (e.g. fseek, clearerr). This is arguably a change from C89, where the wording was ambiguous; the BSDs always had sticky EOF, but the System V lineage would attempt to read from the underlying fd again. GNU libc has followed System V for as long as we've been using libio, but nowadays C99 conformance and BSD compatibility are more important than System V compatibility. You might wonder if changing the _underflow impls is sufficient to apply the C99 semantics to all of the many stdio functions that perform input. It should be enough to cover all paths to _IO_SYSREAD, and the only other functions that call _IO_SYSREAD are the _seekoff impls, which is OK because seeking clears EOF, and the _xsgetn impls, which, as far as I can tell, are unused within glibc. The test programs in this patch use a pseudoterminal to set up the necessary conditions. To facilitate this I added a new test-support function that sets up a pair of pty file descriptors for you; it's almost the same as BSD openpty, the only differences are that it allocates the optionally-returned tty pathname with malloc, and that it crashes if anything goes wrong. [BZ #1190] [BZ #19476] * libio/fileops.c (_IO_new_file_underflow): Return EOF immediately if the _IO_EOF_SEEN bit is already set; update commentary. * libio/oldfileops.c (_IO_old_file_underflow): Likewise. * libio/wfileops.c (_IO_wfile_underflow): Likewise. * support/support_openpty.c, support/tty.h: New files. * support/Makefile (libsupport-routines): Add support_openpty. * libio/tst-fgetc-after-eof.c, wcsmbs/test-fgetwc-after-eof.c: New test cases. * libio/Makefile (tests): Add tst-fgetc-after-eof. * wcsmbs/Makefile (tests): Add tst-fgetwc-after-eof.
173 lines
4.1 KiB
Makefile
173 lines
4.1 KiB
Makefile
# Makefile for support library, used only at build and test time
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# Copyright (C) 2016-2018 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <http://www.gnu.org/licenses/>.
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subdir := support
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include ../Makeconfig
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extra-libs := libsupport
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extra-libs-others = $(extra-libs)
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extra-libs-noinstall := $(extra-libs)
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libsupport-routines = \
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check \
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check_addrinfo \
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check_dns_packet \
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check_hostent \
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check_netent \
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delayed_exit \
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ignore_stderr \
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next_to_fault \
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oom_error \
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resolv_test \
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set_fortify_handler \
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support-xfstat \
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support-xstat \
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support_become_root \
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support_can_chroot \
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support_capture_subprocess \
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support_capture_subprocess_check \
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support_chroot \
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support_enter_mount_namespace \
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support_enter_network_namespace \
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support_format_address_family \
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support_format_addrinfo \
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support_format_dns_packet \
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support_format_herrno \
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support_format_hostent \
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support_format_netent \
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support_isolate_in_subprocess \
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support_openpty \
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support_record_failure \
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support_run_diff \
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support_shared_allocate \
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support_test_compare_failure \
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support_write_file_string \
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support_test_main \
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support_test_verify_impl \
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temp_file \
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write_message \
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xaccept \
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xaccept4 \
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xasprintf \
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xbind \
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xcalloc \
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xchroot \
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xclose \
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xconnect \
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xdlfcn \
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xdup2 \
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xfclose \
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xfopen \
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xfork \
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xftruncate \
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xgetsockname \
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xlisten \
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xlseek \
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xmalloc \
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xmemstream \
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xmkdir \
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xmmap \
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xmprotect \
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xmunmap \
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xopen \
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xpipe \
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xpoll \
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xpthread_attr_destroy \
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xpthread_attr_init \
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xpthread_attr_setdetachstate \
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xpthread_attr_setguardsize \
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xpthread_attr_setstacksize \
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xpthread_barrier_destroy \
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xpthread_barrier_init \
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xpthread_barrier_wait \
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xpthread_cancel \
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xpthread_check_return \
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xpthread_cond_wait \
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xpthread_create \
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xpthread_detach \
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xpthread_join \
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xpthread_mutex_consistent \
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xpthread_mutex_destroy \
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xpthread_mutex_init \
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xpthread_mutex_lock \
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xpthread_mutex_unlock \
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xpthread_mutexattr_destroy \
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xpthread_mutexattr_init \
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xpthread_mutexattr_setprotocol \
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xpthread_mutexattr_setpshared \
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xpthread_mutexattr_setrobust \
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xpthread_mutexattr_settype \
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xpthread_once \
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xpthread_rwlock_init \
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xpthread_rwlock_rdlock \
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xpthread_rwlock_unlock \
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xpthread_rwlock_wrlock \
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xpthread_rwlockattr_init \
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xpthread_rwlockattr_setkind_np \
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xpthread_sigmask \
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xpthread_spin_lock \
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xpthread_spin_unlock \
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xraise \
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xreadlink \
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xrealloc \
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xrecvfrom \
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xsendto \
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xsetsockopt \
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xsigaction \
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xsignal \
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xsocket \
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xstrdup \
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xstrndup \
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xsysconf \
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xunlink \
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xwaitpid \
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xwrite \
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libsupport-static-only-routines := $(libsupport-routines)
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# Only build one variant of the library.
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libsupport-inhibit-o := .os
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ifeq ($(build-shared),yes)
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libsupport-inhibit-o += .o
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endif
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tests = \
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README-testing \
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tst-support-namespace \
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tst-support_capture_subprocess \
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tst-support_format_dns_packet \
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tst-support_record_failure \
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tst-test_compare \
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tst-xreadlink \
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ifeq ($(run-built-tests),yes)
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tests-special = \
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$(objpfx)tst-support_record_failure-2.out
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$(objpfx)tst-support_record_failure-2.out: tst-support_record_failure-2.sh \
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$(objpfx)tst-support_record_failure
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$(SHELL) $< $(common-objpfx) '$(test-program-prefix-before-env)' \
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'$(run-program-env)' '$(test-program-prefix-after-env)' \
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> $@; \
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$(evaluate-test)
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endif
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$(objpfx)tst-support_format_dns_packet: $(common-objpfx)resolv/libresolv.so
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include ../Rules
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