diff --git a/configure.ac b/configure.ac index 879ad15..ec9b35b 100644 --- a/configure.ac +++ b/configure.ac @@ -1,890 +1,895 @@ # Process this file with autoconf to produce a configure script. AC_PREREQ([2.69]) dnl inject zero as a "patch" component of the version if missing in tag; dnl care to bump "X.Y.Z-yank" template below upon each release very desirable AC_INIT([libqb], m4_esyscmd([build-aux/git-version-gen $(echo '$Format:%h??%D$'\ | sed -ne 's/^[$]Format:[^$]*[$]$/.tarball-version/p;tend'\ -e 's/.*tag: v\([^, ][^, ]*\).*/\1-yank/;tv'\ -e 's/^\([[:xdigit:]][[:xdigit:]]*\).*/1.9.0-yank\1/'\ -e ':v' -e 'w .snapshot-version' -e 'i\ .snapshot-version' -e ':end' -e 'q')\ 's/^\(v[0-9][0-9]*\.[0-9][0-9]*\)\([^.].*\)\?$/\1.0\2/']), [developers@clusterlabs.org]) AC_CONFIG_AUX_DIR([build-aux]) AC_CONFIG_SRCDIR([lib/ringbuffer.c]) AC_CONFIG_HEADERS([include/config.h include/qb/qbconfig.h]) AC_USE_SYSTEM_EXTENSIONS AM_INIT_AUTOMAKE([-Wno-portability dist-xz subdir-objects]) dnl automake >= 1.11 offers --enable-silent-rules for suppressing the output from dnl normal compilation. 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CP=cp AC_MSG_CHECKING([for os in ${host_os}]) case "$host_os" in *linux*) AC_DEFINE_UNQUOTED([QB_LINUX], [1], [Compiling for Linux platform]) AC_MSG_RESULT([Linux]) ;; *cygwin*) AC_DEFINE_UNQUOTED([QB_CYGWIN], [1], [Compiling for Cygwin platform]) nongcc_memory_barrier_needed=yes gcc_has_builtin_sync_operations=no AC_MSG_RESULT([Cygwin]) ;; darwin*) AC_DEFINE_UNQUOTED([QB_DARWIN], [1], [Compiling for Darwin platform]) CP=rsync dnl Attribute section appears to work here but fails later with: dnl cc1: error in backend: Global variable 'descriptor.4902' dnl has an invalid section specifier '__verbose': mach-o dnl section specifier requires a segment and section dnl separated by a comma AC_DEFINE_UNQUOTED([DISABLE_POSIX_THREAD_PROCESS_SHARED], [1], [Disable _POSIX_THREAD_PROCESS_SHARED]) AC_MSG_RESULT([Darwin]) ;; *bsd*) AC_DEFINE_UNQUOTED([QB_BSD], [1], [Compiling for BSD platform]) case "$host_os" in *netbsd*) AC_DEFINE_UNQUOTED([UNIX_PATH_MAX], [103], [Unix path length]) ;; *openbsd*) AC_DEFINE_UNQUOTED([UNIX_PATH_MAX], [104], [Unix path length]) ;; esac AC_MSG_RESULT([BSD]) ;; *solaris*) AC_DEFINE_UNQUOTED(DISABLE_IPC_SHM, 1, [Disable shared mem ipc]) AC_DEFINE_UNQUOTED([QB_SOLARIS], [1], [Compiling for Solaris platform]) CP=rsync AC_MSG_RESULT([Solaris]) ;; *gnu*) AC_DEFINE_UNQUOTED([QB_GNU], [1], [Compiling for GNU/Hurd platform]) AC_MSG_RESULT([GNU]) ;; *) AC_MSG_ERROR([Unsupported OS? hmmmm]) ;; esac dnl break on first hit, fallthrough otherwise, until empty or unsupported dnl string reached; output QB_FILE_SYNC macro operates on a file descriptor while : ; do case ${file_sync} in fdatasync) test "x${ac_cv_func_fdatasync}" = "xno" || break file_sync=fsync dnl Darwin provides the function but doesn't have it in headers case "$host_os" in darwin*) AH_BOTTOM([int fdatasync(int fildes);]) ;; esac ;; fsync) test "x${ac_cv_func_fsync}" = "xno" || break file_sync=;; "") break;; *) AC_MSG_ERROR([Cannot select file sync method]);; esac done if test "x${file_sync}" != x; then AC_DEFINE_UNQUOTED([QB_FILE_SYNC(fd)], [${file_sync}(fd)], [File sync method]) else AC_MSG_WARN([No file sync method applicable!]) AC_DEFINE([QB_FILE_SYNC(x)], [], [File sync method]) fi AC_MSG_CHECKING([whether GCC supports builtin sync intrinsics]) if test -z "$gcc_has_builtin_sync_operations"; then gcc_has_builtin_sync_operations=no if test x"$GCC" = xyes && test x$have_mingw != xyes; then AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[int i; __sync_synchronize (); __sync_bool_compare_and_swap (&i, 0, 1); __sync_fetch_and_add (&i, 1); ]])], [gcc_has_builtin_sync_operations=yes], [gcc_has_builtin_sync_operations=no]) fi fi AC_MSG_RESULT($gcc_has_builtin_sync_operations) AM_CONDITIONAL(HAVE_GCC_BUILTINS_FOR_SYNC_OPERATIONS, [test "x$gcc_has_builtin_sync_operations" = xyes]) if test "x$gcc_has_builtin_sync_operations" = xyes; then AC_DEFINE_UNQUOTED(HAVE_GCC_BUILTINS_FOR_SYNC_OPERATIONS, 1, [have builtin sync operations]) fi # __atomic_XXX AC_MSG_CHECKING([whether GCC supports builtin atomic intrinsics]) if test -z "$gcc_has_builtin_atomic_operations"; then gcc_has_builtin_atomic_operations=no if test x"$GCC" = xyes && test x$have_mingw != xyes; then AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[int i; __atomic_load_n(&i, __ATOMIC_ACQUIRE); __atomic_exchange_n(&i, 0, __ATOMIC_RELEASE); ]])], [gcc_has_builtin_atomic_operations=yes], [gcc_has_builtin_atomic_operations=no]) fi fi AC_MSG_RESULT($gcc_has_builtin_atomic_operations) AM_CONDITIONAL(HAVE_GCC_BUILTINS_FOR_ATOMIC_OPERATIONS, [test "x$gcc_has_builtin_atomic_operations" = xyes]) if test "x$gcc_has_builtin_atomic_operations" = xyes; then AC_DEFINE_UNQUOTED(HAVE_GCC_BUILTINS_FOR_ATOMIC_OPERATIONS, 1, [have builtin atomic operations]) fi AC_MSG_CHECKING([whether atomics need memory barrier]) if test -n "$ac_cv_atomic_need_memory_barrier"; then memory_barrier_needed=$ac_cv_atomic_need_memory_barrier else if test x$gcc_has_builtin_sync_operations = xyes; then memory_barrier_needed=yes PACKAGE_FEATURES="$PACKAGE_FEATURES gcc__sync" else memory_barrier_needed=$nongcc_memory_barrier_needed AC_MSG_WARN([-----------------------------]) AC_MSG_WARN([You have gcc but not __sync_bool_compare_and_swap]) AC_MSG_WARN([try CFLAGS="-march= -mtune=native" ./configure]) AC_MSG_WARN([-----------------------------]) fi fi AC_MSG_RESULT($memory_barrier_needed) if test x"$memory_barrier_needed" != xno; then AC_DEFINE_UNQUOTED(QB_ATOMIC_OP_MEMORY_BARRIER_NEEDED, 1, [need atomic memory barrier]) fi LINT_FLAGS="-weak -D__gnuc_va_list=va_list -D__attribute\(x\)= \ -badflag -fcnuse -syntax -unrecog -sysunrecog -warnposix \ +ignoresigns +matchanyintegral +posixlib \ +showscan +showsummary" # local options AC_ARG_ENABLE([ansi], [AS_HELP_STRING([--enable-ansi],[force to build with ANSI standards])]) AC_ARG_ENABLE([fatal-warnings], [AS_HELP_STRING([--enable-fatal-warnings],[enable fatal warnings])]) AC_ARG_ENABLE([debug], [AS_HELP_STRING([--enable-debug],[enable debug build])]) AC_ARG_WITH([sanitizers], [AS_HELP_STRING([--with-sanitizers=...,...], [enable SANitizer build, do *NOT* use for production. Only ASAN/UBSAN/TSAN are currently supported])], [ SANITIZERS="$withval" ], [ SANITIZERS="" ]) AC_ARG_ENABLE([coverage], [AS_HELP_STRING([--enable-coverage],[coverage analysis of the codebase])]) AC_ARG_ENABLE([interlib-deps], [AS_HELP_STRING([--disable-interlib-deps], [disable inter-library dependencies (might break builds)])]) AC_ARG_ENABLE([slow-tests], [AS_HELP_STRING([--enable-slow-tests],[build and run slow tests])]) AC_ARG_WITH([socket-dir], [AS_HELP_STRING([--with-socket-dir=DIR],[socket directory @<:@LOCALSTATEDIR/run@:>@])], [ SOCKETDIR="$withval" ], [ SOCKETDIR="$localstatedir/run" ]) AC_ARG_ENABLE([systemd-journal], [AS_HELP_STRING([--enable-systemd-journal],[Allow use of systemd journal instead of syslog])]) AC_ARG_WITH([force-sockets-config-file], [AS_HELP_STRING([--with-force-sockets-config-file=FILE],[config file to force IPC to use filesystem sockets (Linux & Cygwin only) @<:@SYSCONFDIR/libqb/force-filesystem-sockets@:>@])], [ FORCESOCKETSFILE="$withval" ], [ FORCESOCKETSFILE="$sysconfdir/libqb/force-filesystem-sockets" ]) AC_ARG_ENABLE([tests], [AS_HELP_STRING([--disable-tests],[disable tests])],, [ enable_tests="yes" ]) AM_CONDITIONAL([ENABLE_TESTS], [test x$enable_tests = xyes]) AC_ARG_ENABLE([install-tests], [AS_HELP_STRING([--enable-install-tests],[install tests])],, [ enable_install_tests="no" ]) AM_CONDITIONAL([INSTALL_TESTS], [test x$enable_install_tests = xyes]) AC_ARG_WITH([testdir], [AS_HELP_STRING([--with-testdir=DIR],[path to /usr/lib../libqb/tests/ dir where to install the test suite])], [ TESTDIR="$withval" ], [ TESTDIR="$libdir/libqb/tests" ]) AC_SUBST([TESTDIR]) AC_SUBST(CP) # *FLAGS handling goes here ENV_CFLAGS="$CFLAGS" ENV_CPPFLAGS="$CPPFLAGS" ENV_LDFLAGS="$LDFLAGS" # debug build stuff if test "x${enable_debug}" = xyes; then AC_DEFINE_UNQUOTED([DEBUG], [1], [Compiling Debugging code]) OPT_CFLAGS="-O0" if test "x${GCC}" = xyes; then GDB_FLAGS="-ggdb3" else GDB_FLAGS="-g" fi PACKAGE_FEATURES="$PACKAGE_FEATURES debug" fi # extra warnings EXTRA_WARNINGS="" WARNLIST=" all extra unused shadow missing-prototypes missing-declarations suggest-attribute=noreturn suggest-attribute=format property-attribute-mismatch strict-prototypes pointer-arith write-strings cast-align bad-function-cast missing-format-attribute float-equal format=2 format-signedness shift-overflow shift-overflow=2 overlength-strings redundent-decls init-self uninitialized unknown-pragmas no-unused-parameter unused-const-variable no-format-nonliteral no-format-truncation no-sign-compare " # at least no-sign-compare assumed temporary! for j in $WARNLIST; do if cc_supports_flag -W$j; then EXTRA_WARNINGS="$EXTRA_WARNINGS -W$j"; fi done # warnings suppression gcc_format_complaints=no if test x"$GCC" = xyes && cc_supports_flag -Wmissing-format-attribute; then gcc_format_complaints=yes AC_DEFINE([HAVE_GCC_MISSING_FORMAT_ATTRIBUTE], [], [gcc supports -Wmissing-format-attribute]) fi if test x"$GCC" = xyes && cc_supports_flag -Wsuggest-attribute=format; then gcc_format_complaints=yes AC_DEFINE([HAVE_GCC_SUGGEST_ATTRIBUTE_FORMAT], [], [gcc supports -Wsuggest-attribute=format]) fi dnl pretend GCC (<4.6) is not capable of format complaints when it does not dnl support diagnostic push/pop pragmas (cannot track state reliably, then) if test x"$gcc_format_complaints" = xyes; then backup_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS -Werror" AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ #pragma GCC diagnostic push #pragma GCC diagnostic pop ]])], AC_DEFINE([HAVE_GCC_FORMAT_COMPLAINTS], [], [gcc can complain about missing format attribute])) CFLAGS="$backup_CFLAGS" fi # --- coverage --- if test "x${enable_coverage}" = xyes && \ cc_supports_flag -ftest-coverage && \ cc_supports_flag -fprofile-arcs ; then AC_MSG_NOTICE([Enabling Coverage (enable -O0 by default)]) OPT_CFLAGS="-O0" COVERAGE_CFLAGS="-ftest-coverage -fprofile-arcs" COVERAGE_LDFLAGS="-ftest-coverage -fprofile-arcs" PACKAGE_FEATURES="$PACKAGE_FEATURES coverage" else COVERAGE_CFLAGS="" COVERAGE_LDFLAGS="" fi # --- inter-library dependencies --- # because of debian/ubuntu swimming against the stream # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=702737, # override the libtool variable by force because the current # arrangement relies on transitive dependency propagation AC_MSG_NOTICE([Enabling inter-library dependencies: $enable_interlib_deps]) if test "x${enable_interlib_deps}" = xno; then link_all_deplibs=no else link_all_deplibs=yes fi # --- slow tests --- if test "x${enable_slow_tests}" = xyes ; then AC_DEFINE([HAVE_SLOW_TESTS], 1,[have slow tests]) AC_MSG_NOTICE([Enabling Slow tests]) fi AM_CONDITIONAL(HAVE_SLOW_TESTS, [test "x${enable_slow_tests}" = xyes]) AC_SUBST(HAVE_SLOW_TESTS) # --- ansi --- if test "x${enable_ansi}" = xyes && \ cc_supports_flag -std=iso9899:199409 ; then AC_MSG_NOTICE([Enabling ANSI Compatibility]) ANSI_CPPFLAGS="-ansi -D_GNU_SOURCE -DANSI_ONLY" PACKAGE_FEATURES="$PACKAGE_FEATURES ansi" else ANSI_CPPFLAGS="" fi # --- fatal warnings --- if test "x${enable_fatal_warnings}" = xyes && \ cc_supports_flag -Werror ; then AC_MSG_NOTICE([Enabling Fatal Warnings (-Werror)]) WERROR_CFLAGS="-Werror" PACKAGE_FEATURES="$PACKAGE_FEATURES fatal-warnings" else WERROR_CFLAGS="" fi # --- ASAN/UBSAN/TSAN (see man gcc) --- # when using SANitizers, we need to pass the -fsanitize.. # to both CFLAGS and LDFLAGS. The CFLAGS/LDFLAGS must be # specified as first in the list or there will be runtime # issues (for example user has to LD_PRELOAD asan for it to work # properly). if test -n "${SANITIZERS}"; then SANITIZERS=$(echo $SANITIZERS | sed -e 's/,/ /g') for SANITIZER in $SANITIZERS; do case $SANITIZER in asan|ASAN) SANITIZERS_CFLAGS="$SANITIZERS_CFLAGS -fsanitize=address" SANITIZERS_LDFLAGS="$SANITIZERS_LDFLAGS -fsanitize=address -lasan" AC_CHECK_LIB([asan],[main],,AC_MSG_ERROR([Unable to find libasan])) ;; ubsan|UBSAN) SANITIZERS_CFLAGS="$SANITIZERS_CFLAGS -fsanitize=undefined" SANITIZERS_LDFLAGS="$SANITIZERS_LDFLAGS -fsanitize=undefined -lubsan" AC_CHECK_LIB([ubsan],[main],,AC_MSG_ERROR([Unable to find libubsan])) ;; tsan|TSAN) SANITIZERS_CFLAGS="$SANITIZERS_CFLAGS -fsanitize=thread" SANITIZERS_LDFLAGS="$SANITIZERS_LDFLAGS -fsanitize=thread -ltsan" AC_CHECK_LIB([tsan],[main],,AC_MSG_ERROR([Unable to find libtsan])) ;; esac done fi # final build of *FLAGS CFLAGS="$SANITIZERS_CFLAGS $ENV_CFLAGS $OPT_CFLAGS $GDB_FLAGS \ $COVERAGE_CFLAGS $EXTRA_WARNINGS $WERROR_CFLAGS" CPPFLAGS="$ENV_CPPFLAGS $ANSI_CPPFLAGS" LDFLAGS="$SANITIZERS_LDFLAGS $ENV_LDFLAGS $COVERAGE_LDFLAGS" if test -f /usr/share/dict/words ; then HAVE_DICT_WORDS=yes AC_DEFINE([HAVE_DICT_WORDS], 1, "Have /usr/share/dict/words") fi AM_CONDITIONAL([HAVE_DICT_WORDS], [test "x$HAVE_DICT_WORDS" = xyes]) # substitute what we need: AC_SUBST([SOCKETDIR]) AC_SUBST([LINT_FLAGS]) AC_SUBST([FORCESOCKETSFILE]) AC_DEFINE_UNQUOTED([SOCKETDIR], "$(eval echo ${SOCKETDIR})", [Socket directory]) AC_DEFINE_UNQUOTED([LOCALSTATEDIR], "$(eval echo ${localstatedir})", [localstate directory]) AC_DEFINE_UNQUOTED([PACKAGE_FEATURES], "${PACKAGE_FEATURES}", [quarterback built-in features]) AC_DEFINE_UNQUOTED([FORCESOCKETSFILE], "$(eval echo ${FORCESOCKETSFILE})", [for sockets config file]) # version parsing (for qbconfig.h) AC_DEFINE_UNQUOTED([QB_VER_MAJOR], [$(echo "${VERSION}" \ | sed -e 's|^\([[0-9]][[0-9]]*\).*|\1|' \ -e t -e 's|.*|1|')], [libqb major version]) AC_DEFINE_UNQUOTED([QB_VER_MINOR], [$(echo "${VERSION}" \ | sed -e 's|^[[0-9]][[0-9]]*\.\([[0-9]][[0-9]]*\).*|\1|' \ -e t -e 's|.*|0|')], [libqb minor version]) AC_DEFINE_UNQUOTED([QB_VER_MICRO], [$(echo "${VERSION}" \ | sed -e 's|^[[0-9]][[0-9]]*\.[[0-9]][[0-9]]*\.\([[0-9]][[0-9]]*\).*|\1|' \ -e t -e 's|.*|0|')], [libqb patch version]) AC_DEFINE_UNQUOTED([QB_VER_REST], [$(echo "${VERSION}" \ | sed -e 's|^[[0-9]][[0-9]]*\(\.[[0-9]][[0-9]]*\)\{0,2\}\(.*\)|"\2"|' \ -e t -e 's|.*|""|')], [libqb patch version]) AX_PROG_DATE AS_IF([test "$ax_cv_prog_date_gnu_date:$ax_cv_prog_date_gnu_utc" = yes:yes], [UTC_DATE_AT="date -u -d@"], [AS_IF([test "x$ax_cv_prog_date_bsd_date" = xyes], [UTC_DATE_AT="date -u -r"], [AC_MSG_ERROR([date utility unable to convert epoch to UTC])])]) AC_SUBST([UTC_DATE_AT]) AC_ARG_VAR([SOURCE_EPOCH],[last modification date of the source]) AC_MSG_NOTICE([trying to determine source epoch]) AC_MSG_CHECKING([for source epoch in \$SOURCE_EPOCH]) AS_IF([test -n "$SOURCE_EPOCH"], [AC_MSG_RESULT([yes])], [AC_MSG_RESULT([no]) AC_MSG_CHECKING([for source epoch in source_epoch file]) AS_IF([test -e "$srcdir/source_epoch"], [read SOURCE_EPOCH <"$srcdir/source_epoch" AC_MSG_RESULT([yes])], [AC_MSG_RESULT([no]) AC_MSG_CHECKING([for source epoch baked in by gitattributes export-subst]) SOURCE_EPOCH='$Format:%ct$' # template for rewriting by git-archive AS_CASE([$SOURCE_EPOCH], [?Format:*], # was not rewritten [AC_MSG_RESULT([no]) AC_MSG_CHECKING([for source epoch in \$SOURCE_DATE_EPOCH]) AS_IF([test "x$SOURCE_DATE_EPOCH" != x], [SOURCE_EPOCH="$SOURCE_DATE_EPOCH" AC_MSG_RESULT([yes])], [AC_MSG_RESULT([no]) AC_MSG_CHECKING([whether git log can provide a source epoch]) SOURCE_EPOCH=f${SOURCE_EPOCH#\$F} # convert into git log --pretty format SOURCE_EPOCH=$(cd "$srcdir" && git log -1 --pretty=${SOURCE_EPOCH%$} 2>/dev/null) AS_IF([test -n "$SOURCE_EPOCH"], [AC_MSG_RESULT([yes])], [AC_MSG_RESULT([no, using current time and breaking reproducibility]) SOURCE_EPOCH=$(date +%s)])])], [AC_MSG_RESULT([yes])] )]) ]) AC_MSG_NOTICE([using source epoch $($UTC_DATE_AT$SOURCE_EPOCH +'%F %T %Z')]) AC_CONFIG_FILES([Makefile include/Makefile include/qb/Makefile lib/Makefile lib/libqb.pc tools/Makefile tests/Makefile tests/test.conf examples/Makefile doxygen2man/Makefile docs/Makefile docs/man.dox lib/qblog_script.la:lib/qblog_script.la.in]) AC_OUTPUT AC_MSG_RESULT([]) AC_MSG_RESULT([$PACKAGE configuration:]) AC_MSG_RESULT([ Version = ${VERSION}]) AC_MSG_RESULT([ Prefix = ${prefix}]) AC_MSG_RESULT([ Executables = ${sbindir}]) AC_MSG_RESULT([ Man pages = ${mandir}]) AC_MSG_RESULT([ Doc dir = ${docdir}]) AC_MSG_RESULT([ Libraries = ${libdir}]) AC_MSG_RESULT([ Header files = ${includedir}]) AC_MSG_RESULT([ Arch-independent files = ${datadir}]) AC_MSG_RESULT([ State information = ${localstatedir}]) AC_MSG_RESULT([ System configuration = ${sysconfdir}]) AC_MSG_RESULT([ SOCKETDIR = ${SOCKETDIR}]) AC_MSG_RESULT([ Features = ${PACKAGE_FEATURES}]) AC_MSG_RESULT([ Use systemd journal = ${USE_JOURNAL}]) AC_MSG_RESULT([]) AC_MSG_RESULT([$PACKAGE build info:]) AC_MSG_RESULT([ Optimization = ${OPT_CFLAGS}]) AC_MSG_RESULT([ Debug options = ${GDB_CFLAGS}]) AC_MSG_RESULT([ Extra compiler warnings = ${EXTRA_WARNING}]) AC_MSG_RESULT([ Env. defined CFLAG = ${ENV_CFLAGS}]) AC_MSG_RESULT([ Env. defined CPPFLAGS = ${ENV_CPPFLAGS}]) AC_MSG_RESULT([ Env. defined LDFLAGS = ${ENV_LDFLAGS}]) AC_MSG_RESULT([ ANSI defined CPPFLAGS = ${ANSI_CPPFLAGS}]) AC_MSG_RESULT([ Coverage CFLAGS = ${COVERAGE_CFLAGS}]) AC_MSG_RESULT([ Coverage LDFLAGS = ${COVERAGE_LDFLAGS}]) AC_MSG_RESULT([ Fatal War. CFLAGS = ${WERROR_CFLAGS}]) AC_MSG_RESULT([ Final CFLAGS = ${CFLAGS}]) AC_MSG_RESULT([ Final CPPFLAGS = ${CPPFLAGS}]) AC_MSG_RESULT([ Final LDFLAGS = ${LDFLAGS}]) diff --git a/lib/unix.c b/lib/unix.c index 6bd3cc2..0dc7647 100644 --- a/lib/unix.c +++ b/lib/unix.c @@ -1,617 +1,617 @@ /* * Copyright (C) 2011 Red Hat, Inc. * * All rights reserved. * * Author: Angus Salkeld * * libqb is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 2.1 of the License, or * (at your option) any later version. * * libqb 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with libqb. If not, see . */ #include "os_base.h" #ifdef HAVE_SYS_SHM_H #include #endif #ifdef HAVE_SYS_MMAN_H #include #endif #if defined(HAVE_FCNTL_H) && defined(HAVE_POSIX_FALLOCATE) #include #endif #include "util_int.h" #include #include #include #if defined(MAP_ANON) && ! defined(MAP_ANONYMOUS) /* * BSD derivatives usually have MAP_ANON, not MAP_ANONYMOUS **/ #define MAP_ANONYMOUS MAP_ANON #endif char * qb_strerror_r(int errnum, char *buf, size_t buflen) { #ifdef STRERROR_R_CHAR_P return strerror_r(errnum, buf, buflen); #else if (strerror_r(errnum, buf, buflen) != 0) { buf[0] = '\0'; } return buf; #endif /* STRERROR_R_CHAR_P */ } static int32_t open_mmap_file(char *path, uint32_t file_flags) { if (strstr(path, "XXXXXX") != NULL) { mode_t old_mode = umask(077); int32_t temp_fd = mkstemp(path); (void)umask(old_mode); return temp_fd; } return open(path, file_flags, 0600); } #if defined(QB_BSD) || !defined(HAVE_POSIX_FALLOCATE) static int local_fallocate(int fd, size_t bytes) { long page_size = sysconf(_SC_PAGESIZE); long write_size = QB_MIN(page_size, bytes); char *buffer = NULL; int i; size_t written; if (page_size < 0) { goto error_exit; } buffer = calloc(1, write_size); if (buffer == NULL) { goto error_exit; } for (i = 0; i < (bytes / write_size); i++) { retry_write: written = write(fd, buffer, write_size); if (written == -1 && errno == EINTR) { goto retry_write; } if (written != write_size) { free(buffer); errno = ENOSPC; goto error_exit; } } free(buffer); return 0; error_exit: return -1; } #endif int32_t qb_sys_mmap_file_open(char *path, const char *file, size_t bytes, uint32_t file_flags) { int32_t fd; int32_t res = 0; #ifndef HAVE_POSIX_FALLOCATE ssize_t written; char *buffer = NULL; int32_t i; #endif char *is_absolute = strchr(file, '/'); #ifdef HAVE_POSIX_FALLOCATE int32_t fallocate_retry = 5; #endif if (is_absolute) { (void)strlcpy(path, file, PATH_MAX); } else { #if defined(QB_LINUX) || defined(QB_CYGWIN) /* This is only now called when talking to an old libqb where we need to add qb- to the name */ snprintf(path, PATH_MAX, "/dev/shm/qb-%s", file); #else snprintf(path, PATH_MAX, "%s/%s", SOCKETDIR, file); is_absolute = path; #endif } fd = open_mmap_file(path, file_flags); if (fd < 0 && !is_absolute) { qb_util_perror(LOG_ERR, "couldn't open file %s", path); snprintf(path, PATH_MAX, "%s/%s", SOCKETDIR, file); fd = open_mmap_file(path, file_flags); if (fd < 0) { res = -errno; qb_util_perror(LOG_ERR, "couldn't open file %s", path); return res; } } else if (fd < 0 && is_absolute) { res = -errno; qb_util_perror(LOG_ERR, "couldn't open file %s", path); return res; } #ifndef _WIN32 /* ftruncate not supported on WSL https://github.com/microsoft/WSL/issues/902 */ if (ftruncate(fd, bytes) == -1) { res = -errno; qb_util_perror(LOG_ERR, "couldn't truncate file %s", path); goto unlink_exit; } #endif #ifdef HAVE_POSIX_FALLOCATE /* posix_fallocate(3) can be interrupted by a signal, so retry few times before giving up */ do { fallocate_retry--; res = posix_fallocate(fd, 0, bytes); if (res == EINTR) { qb_util_log(LOG_DEBUG, "got EINTR trying to allocate file %s, retrying...", path); continue; #ifdef QB_BSD } else if (res == EINVAL) { /* posix_fallocate() fails on ZFS https://lists.freebsd.org/pipermail/freebsd-current/2018-February/068448.html */ qb_util_log(LOG_DEBUG, "posix_fallocate returned EINVAL - running on ZFS?"); if (file_flags & O_CREAT) { if (local_fallocate(fd, bytes)) { goto unlink_exit; } } #endif } else if (res != 0) { errno = res; res = -1 * res; qb_util_perror(LOG_ERR, "couldn't allocate file %s", path); goto unlink_exit; } break; } while (fallocate_retry > 0); #else if (file_flags & O_CREAT) { if (local_fallocate(fd, bytes)) { goto unlink_exit; } } #endif /* HAVE_POSIX_FALLOCATE */ return fd; unlink_exit: unlink(path); if (fd >= 0) { close(fd); } return res; } int32_t qb_sys_circular_mmap(int32_t fd, void **buf, size_t bytes) { void *addr_orig = NULL; void *addr; void *addr_next; int32_t res; int flags = MAP_ANONYMOUS; #ifdef QB_FORCE_SHM_ALIGN /* On a number of arches any fixed and shared mmap() mapping address * must be aligned to 16k. If the first mmap() below is not shared then * the first mmap() will succeed because these restrictions do not apply to * private mappings. The second mmap() wants a shared memory mapping but * the address returned by the first one is only page-aligned and not * aligned to 16k. */ flags |= MAP_SHARED; #else flags |= MAP_PRIVATE; #endif /* QB_FORCE_SHM_ALIGN */ -#if defined(QB_ARCH_HPPA) +#if defined(QB_ARCH_HPPA) || defined(QB_ARCH_LOONGSON) /* map twice the size we want to make sure we have already mapped the second memory location behind it too. Otherwise the Linux kernel may map it in the upper memory so that we can't map the second part afterwards since it will conflict. */ addr = mmap(NULL, 2*bytes, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); if (addr == MAP_FAILED) return -errno; addr_orig = addr; #else addr_orig = mmap(NULL, bytes << 1, PROT_NONE, flags, -1, 0); if (addr_orig == MAP_FAILED) { return -errno; } addr = mmap(addr_orig, bytes, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED, fd, 0); #endif if (addr != addr_orig) { res = -errno; goto cleanup_fail; } #if defined(QB_BSD) && defined(MADV_NOSYNC) madvise(addr_orig, bytes, MADV_NOSYNC); #endif addr_next = ((char *)addr_orig) + bytes; addr = mmap(addr_next, bytes, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED, fd, 0); if (addr != addr_next) { res = -errno; goto cleanup_fail; } #if defined(QB_BSD) && defined(MADV_NOSYNC) madvise(((char *)addr_orig) + bytes, bytes, MADV_NOSYNC); #endif res = close(fd); if (res) { goto cleanup_fail_noclose; } *buf = addr_orig; return 0; cleanup_fail: close(fd); cleanup_fail_noclose: if (addr_orig) { munmap(addr_orig, bytes << 1); } return res; } int32_t qb_sys_fd_nonblock_cloexec_set(int32_t fd) { int32_t res = 0; int32_t oldflags = fcntl(fd, F_GETFD, 0); if (oldflags < 0) { oldflags = 0; } oldflags |= FD_CLOEXEC; res = fcntl(fd, F_SETFD, oldflags); if (res == -1) { res = -errno; qb_util_perror(LOG_ERR, "Could not set close-on-exit on fd:%d", fd); return res; } res = fcntl(fd, F_SETFL, O_NONBLOCK); if (res == -1) { res = -errno; qb_util_log(LOG_ERR, "Could not set non-blocking on fd:%d", fd); } return res; } int32_t qb_sys_unlink_or_truncate(const char *path, int32_t truncate_fallback) { int32_t res = 0; if (unlink(path) == -1) { res = errno; qb_util_perror(LOG_DEBUG, "Unlinking file: %s", path); if (res != ENOENT && truncate_fallback) { res = errno = 0; if (truncate(path, 0) == -1) { res = errno; qb_util_perror(LOG_DEBUG, "Truncating file: %s", path); } } } return -res; } #if defined(HAVE_OPENAT) && defined(HAVE_UNLINKAT) int32_t qb_sys_unlink_or_truncate_at(int32_t dirfd, const char *path, int32_t truncate_fallback) { int32_t fd, res = 0; if (unlinkat(dirfd, path, 0) == -1) { res = errno; qb_util_perror(LOG_DEBUG, "Unlinking file at dir: %s", path); if (res != ENOENT && truncate_fallback) { res = errno = 0; if ((fd = openat(dirfd, path, O_WRONLY|O_TRUNC)) == -1) { res = errno; qb_util_perror(LOG_DEBUG, "Truncating file at dir: %s", path); } else { close(fd); } } } return -res; } #endif void qb_sigpipe_ctl(enum qb_sigpipe_ctl ctl) { #if !defined(HAVE_MSG_NOSIGNAL) && !defined(HAVE_SO_NOSIGPIPE) struct sigaction act; struct sigaction oact; act.sa_handler = SIG_IGN; if (ctl == QB_SIGPIPE_IGNORE) { sigaction(SIGPIPE, &act, &oact); } else { sigaction(SIGPIPE, &oact, NULL); } #endif /* !MSG_NOSIGNAL && !SO_NOSIGPIPE */ } void qb_socket_nosigpipe(int32_t s) { #if !defined(HAVE_MSG_NOSIGNAL) && defined(HAVE_SO_NOSIGPIPE) int32_t on = 1; setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, (void *)&on, sizeof(on)); #endif /* !MSG_NOSIGNAL && SO_NOSIGPIPE */ } /* * atomic operations * -------------------------------------------------------------------------- */ #ifndef HAVE_GCC_BUILTINS_FOR_SYNC_OPERATIONS /* * We have to use the slow, but safe locking method */ static qb_thread_lock_t *qb_atomic_mutex = NULL; void qb_atomic_init(void) { if (qb_atomic_mutex == NULL) { qb_atomic_mutex = qb_thread_lock_create(QB_THREAD_LOCK_SHORT); } assert(qb_atomic_mutex); } int32_t qb_atomic_int_exchange_and_add(volatile int32_t QB_GNUC_MAY_ALIAS * atomic, int32_t val) { int32_t result; qb_thread_lock(qb_atomic_mutex); result = *atomic; *atomic += val; qb_thread_unlock(qb_atomic_mutex); return result; } void qb_atomic_int_add(volatile int32_t QB_GNUC_MAY_ALIAS * atomic, int32_t val) { qb_thread_lock(qb_atomic_mutex); *atomic += val; qb_thread_unlock(qb_atomic_mutex); } int32_t qb_atomic_int_compare_and_exchange(volatile int32_t QB_GNUC_MAY_ALIAS * atomic, int32_t oldval, int32_t newval) { int32_t result; qb_thread_lock(qb_atomic_mutex); if (*atomic == oldval) { result = QB_TRUE; *atomic = newval; } else { result = QB_FALSE; } qb_thread_unlock(qb_atomic_mutex); return result; } int32_t qb_atomic_pointer_compare_and_exchange(volatile void *QB_GNUC_MAY_ALIAS * atomic, void *oldval, void *newval) { int32_t result; qb_thread_lock(qb_atomic_mutex); if (*atomic == oldval) { result = QB_TRUE; *atomic = newval; } else { result = QB_FALSE; } qb_thread_unlock(qb_atomic_mutex); return result; } #ifdef QB_ATOMIC_OP_MEMORY_BARRIER_NEEDED int32_t (qb_atomic_int_get) (volatile int32_t QB_GNUC_MAY_ALIAS * atomic) { int32_t result; qb_thread_lock(qb_atomic_mutex); result = *atomic; qb_thread_unlock(qb_atomic_mutex); return result; } void (qb_atomic_int_set) (volatile int32_t QB_GNUC_MAY_ALIAS * atomic, int32_t newval) { qb_thread_lock(qb_atomic_mutex); *atomic = newval; qb_thread_unlock(qb_atomic_mutex); } void * (qb_atomic_pointer_get) (volatile void *QB_GNUC_MAY_ALIAS * atomic) { void *result; qb_thread_lock(qb_atomic_mutex); result = (void*)*atomic; qb_thread_unlock(qb_atomic_mutex); return result; } void (qb_atomic_pointer_set) (volatile void *QB_GNUC_MAY_ALIAS * atomic, void *newval) { qb_thread_lock(qb_atomic_mutex); *atomic = newval; qb_thread_unlock(qb_atomic_mutex); } #endif /* QB_ATOMIC_OP_MEMORY_BARRIER_NEEDED */ #else /* * gcc built-ins */ void qb_atomic_init(void) { } int32_t qb_atomic_int_exchange_and_add(volatile int32_t QB_GNUC_MAY_ALIAS * atomic, int32_t val) { return __sync_fetch_and_add(atomic, val); } void qb_atomic_int_add(volatile int32_t QB_GNUC_MAY_ALIAS * atomic, int32_t val) { __sync_fetch_and_add(atomic, val); } int32_t qb_atomic_int_compare_and_exchange(volatile int32_t QB_GNUC_MAY_ALIAS * atomic, int32_t oldval, int32_t newval) { return __sync_bool_compare_and_swap(atomic, oldval, newval); } int32_t qb_atomic_pointer_compare_and_exchange(volatile void *QB_GNUC_MAY_ALIAS * atomic, void *oldval, void *newval) { return __sync_bool_compare_and_swap(atomic, oldval, newval); } #ifdef QB_ATOMIC_OP_MEMORY_BARRIER_NEEDED #define QB_ATOMIC_MEMORY_BARRIER __sync_synchronize () int32_t (qb_atomic_int_get) (volatile int32_t QB_GNUC_MAY_ALIAS * atomic) { QB_ATOMIC_MEMORY_BARRIER; return *atomic; } void (qb_atomic_int_set) (volatile int32_t QB_GNUC_MAY_ALIAS * atomic, int32_t newval) { *atomic = newval; QB_ATOMIC_MEMORY_BARRIER; } void * (qb_atomic_pointer_get) (volatile void *QB_GNUC_MAY_ALIAS * atomic) { QB_ATOMIC_MEMORY_BARRIER; return (void*)*atomic; } void (qb_atomic_pointer_set) (volatile void *QB_GNUC_MAY_ALIAS * atomic, void *newval) { *atomic = newval; QB_ATOMIC_MEMORY_BARRIER; } #endif /* QB_ATOMIC_OP_MEMORY_BARRIER_NEEDED */ #endif /* HAVE_GCC_BUILTINS_FOR_SYNC_OPERATIONS */ #ifndef QB_ATOMIC_OP_MEMORY_BARRIER_NEEDED int32_t (qb_atomic_int_get) (volatile int32_t QB_GNUC_MAY_ALIAS * atomic) { return qb_atomic_int_get(atomic); } void (qb_atomic_int_set) (volatile int32_t QB_GNUC_MAY_ALIAS * atomic, int32_t newval) { qb_atomic_int_set(atomic, newval); } void * (qb_atomic_pointer_get) (volatile void *QB_GNUC_MAY_ALIAS * atomic) { return qb_atomic_pointer_get(atomic); } void (qb_atomic_pointer_set) (volatile void *QB_GNUC_MAY_ALIAS * atomic, void *newval) { qb_atomic_pointer_set(atomic, newval); } #endif /* !QB_ATOMIC_OP_MEMORY_BARRIER_NEEDED */