mirror of
https://sourceware.org/git/glibc.git
synced 2025-01-06 01:21:08 +00:00
607449506f
The function closes all open file descriptors greater than or equal to input argument. Negative values are clamped to 0, i.e, it will close all file descriptors. As indicated by the bug report, this is a common symbol provided by different systems (Solaris, OpenBSD, NetBSD, FreeBSD) and, although its has inherent issues with not taking in consideration internal libc file descriptors (such as syslog), this is also a common feature used in multiple projects [1][2][3][4][5]. The Linux fallback implementation iterates over /proc and close all file descriptors sequentially. Although it was raised the questioning whether getdents on /proc/self/fd might return disjointed entries when file descriptor are closed; it does not seems the case on my testing on multiple kernel (v4.18, v5.4, v5.9) and the same strategy is used on different projects [1][2][3][5]. Also, the interface is set a fail-safe meaning that a failure in the fallback results in a process abort. Checked on x86_64-linux-gnu and i686-linux-gnu on kernel 5.11 and 4.15. [1]5238e95759/src/basic/fd-util.c (L217)[2]ddf4b77e11/src/lxc/start.c (L236)[3]9e4f2f3a6b/Modules/_posixsubprocess.c (L220)[4]5f47c0613e/src/libstd/sys/unix/process2.rs (L303-L308)[5] https://github.com/openjdk/jdk/blob/master/src/java.base/unix/native/libjava/childproc.c#L82
337 lines
11 KiB
Makefile
337 lines
11 KiB
Makefile
# Option to pass to Python scripts to set the C compiler. Rewriting
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# MODULE_NAME is required to enable the _ISOMAC verbatim header
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# environment.
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sysdeps-linux-python-cc = \
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--cc="$(CC) $(patsubst -DMODULE_NAME=%,-DMODULE_NAME=testsuite,$(CPPFLAGS))"
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# Additional dependencies for Python scripts.
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sysdeps-linux-python-deps = \
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$(..)sysdeps/unix/sysv/linux/glibcsyscalls.py \
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$(..)scripts/glibcextract.py
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# Invocation of the Python interpreter with the Python search path.
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sysdeps-linux-python = \
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PYTHONPATH=$(..)scripts:$(..)sysdeps/unix/sysv/linux $(PYTHON)
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ifndef subdir
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# This target performs two actions:
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#
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# Replace <arch-syscall.h> with a file generated from kernel headers
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# and <fixup-asm-unistd.h>. Both files are located via the sysdeps
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# override search path.
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#
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# Update sysdeps/unix/sysv/linux/syscall-names.list with additional
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# names found in the generated <arch-syscall.h> file, so that the
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# global system call names list is a superset of the
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# architecture-specific system call names.
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#
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# To bootstrap a new architecture, create an empty file in the right
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# place and run `make update-syscall-lists' from the top-level of a
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# configured, but not-yet-built glibc tree.
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#
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# --lock points to a file not replaced during the update operation, so
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# that mutual exclusion is achieved.
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.PHONY: update-syscall-lists
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update-syscall-lists: arch-syscall.h
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$(sysdeps-linux-python) \
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sysdeps/unix/sysv/linux/update-syscall-lists.py \
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$(sysdeps-linux-python-cc) \
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--lock=sysdeps/unix/sysv/linux/update-syscall-lists.py $< \
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sysdeps/unix/sysv/linux/syscall-names.list
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endif
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ifeq ($(subdir),csu)
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sysdep_routines += errno-loc
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endif
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ifeq ($(subdir),assert)
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CFLAGS-assert.c += -DFATAL_PREPARE_INCLUDE='<fatal-prepare.h>'
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CFLAGS-assert-perr.c += -DFATAL_PREPARE_INCLUDE='<fatal-prepare.h>'
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endif
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ifeq ($(subdir),malloc)
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CFLAGS-malloc.c += -DMORECORE_CLEARS=2
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endif
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ifeq ($(subdir),misc)
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sysdep_routines += adjtimex clone umount umount2 readahead sysctl \
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setfsuid setfsgid epoll_pwait signalfd \
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eventfd eventfd_read eventfd_write prlimit \
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personality epoll_wait tee vmsplice splice \
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open_by_handle_at mlock2 pkey_mprotect pkey_set pkey_get \
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timerfd_gettime timerfd_settime prctl \
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process_vm_readv process_vm_writev clock_adjtime \
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pselect32 \
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xstat fxstat lxstat xstat64 fxstat64 lxstat64 \
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fxstatat fxstatat64 \
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xmknod xmknodat convert_scm_timestamps \
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closefrom_fallback
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CFLAGS-gethostid.c = -fexceptions
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CFLAGS-tee.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-vmsplice.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-splice.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-open_by_handle_at.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-sync_file_range.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-pselect32.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-tst-writev.c += "-DARTIFICIAL_LIMIT=(0x80000000-sysconf(_SC_PAGESIZE))"
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sysdep_headers += sys/mount.h sys/acct.h \
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sys/klog.h \
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sys/user.h sys/prctl.h \
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sys/kd.h sys/soundcard.h sys/vt.h \
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sys/quota.h sys/fsuid.h \
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scsi/sg.h scsi/scsi.h scsi/scsi_ioctl.h sys/pci.h \
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sys/raw.h sys/personality.h sys/epoll.h \
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bits/a.out.h sys/inotify.h sys/signalfd.h sys/eventfd.h \
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sys/timerfd.h sys/fanotify.h bits/eventfd.h bits/inotify.h \
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bits/signalfd.h bits/timerfd.h bits/epoll.h \
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bits/socket_type.h bits/syscall.h \
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bits/mman-linux.h bits/mman-shared.h bits/ptrace-shared.h \
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bits/siginfo-arch.h bits/siginfo-consts-arch.h \
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bits/procfs.h bits/procfs-id.h bits/procfs-extra.h \
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bits/procfs-prregset.h bits/mman-map-flags-generic.h \
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bits/shmlba.h \
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bits/termios-struct.h bits/termios-c_cc.h \
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bits/termios-c_iflag.h bits/termios-c_oflag.h \
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bits/termios-baud.h bits/termios-c_cflag.h \
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bits/termios-c_lflag.h bits/termios-tcflow.h \
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bits/termios-misc.h \
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bits/types/struct_semid_ds.h \
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bits/types/struct_msqid_ds.h \
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bits/types/struct_shmid_ds.h \
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bits/ipc-perm.h \
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bits/struct_stat.h \
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bits/struct_stat_time64_helper.h \
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bits/types/struct_msqid64_ds.h \
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bits/types/struct_msqid64_ds_helper.h \
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bits/types/struct_semid64_ds.h \
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bits/types/struct_semid64_ds_helper.h \
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bits/types/struct_shmid64_ds.h \
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bits/types/struct_shmid64_ds_helper.h
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tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
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tst-quota tst-sync_file_range tst-sysconf-iov_max tst-ttyname \
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test-errno-linux tst-memfd_create tst-mlock2 tst-pkey \
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tst-rlimit-infinity tst-ofdlocks tst-gettid tst-gettid-kill \
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tst-tgkill tst-sysvsem-linux tst-sysvmsg-linux tst-sysvshm-linux \
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tst-timerfd tst-ppoll \
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tst-clock_adjtime tst-adjtimex tst-ntp_adjtime tst-ntp_gettime \
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tst-ntp_gettimex tst-sigtimedwait tst-misalign-clone \
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tst-close_range
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# Test for the symbol version of fcntl that was replaced in glibc 2.28.
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ifeq ($(have-GLIBC_2.27)$(build-shared),yesyes)
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tests += tst-ofdlocks-compat
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endif
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tests-internal += tst-sigcontext-get_pc
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tests-time64 += \
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tst-adjtimex-time64 \
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tst-clock_adjtime-time64 \
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tst-ntp_adjtime-time64 \
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tst-ntp_gettime-time64 \
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tst-ntp_gettimex-time64 \
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tst-ppoll-time64 \
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tst-sigtimedwait-time64 \
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tst-timerfd-time64 \
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CFLAGS-tst-sigcontext-get_pc.c = -fasynchronous-unwind-tables
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# Generate the list of SYS_* macros for the system calls (__NR_*
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# macros). The file syscall-names.list contains all possible system
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# call names, and the generated header file produces SYS_* macros for
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# the __NR_* macros which are actually defined.
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generated += bits/syscall.h
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$(objpfx)bits/syscall.h: \
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../sysdeps/unix/sysv/linux/gen-syscall-h.awk \
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../sysdeps/unix/sysv/linux/syscall-names.list
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$(make-target-directory)
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LC_ALL=C $(AWK) -f $^ > $@-tmp
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$(move-if-change) $@-tmp $@
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before-compile += $(objpfx)bits/syscall.h
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# All macros defined by <sys/syscall.h>. Include <bits/syscall.h>
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# explicitly because <sys/sycall.h> skips it if _LIBC is defined.
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$(objpfx)tst-syscall-list-macros.list: \
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$(objpfx)bits/syscall.h ../sysdeps/unix/sysv/linux/sys/syscall.h
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printf '#include <linux/version.h>\n\
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#include <sys/syscall.h>\n#include <bits/syscall.h>\n' | \
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$(CC) -E -o $@-tmp $(CFLAGS) $(CPPFLAGS) -x c - -dM
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$(move-if-change) $@-tmp $@
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# __NR_* system call names. Used by the test below.
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$(objpfx)tst-syscall-list-nr.list: \
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../sysdeps/unix/sysv/linux/filter-nr-syscalls.awk \
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$(objpfx)tst-syscall-list-macros.list
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LC_ALL=C $(AWK) -f $^ > $@-tmp
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$(move-if-change) $@-tmp $@
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# SYS_* system call names. Used by the test below.
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$(objpfx)tst-syscall-list-sys.list: $(objpfx)tst-syscall-list-macros.list
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LC_ALL=C $(AWK) '/^#define SYS_/ { print substr($$2, 5) }' $< > $@-tmp
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$(move-if-change) $@-tmp $@
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tests-special += $(objpfx)tst-syscall-list.out
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$(objpfx)tst-syscall-list.out: \
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../sysdeps/unix/sysv/linux/tst-syscall-list.sh \
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$(objpfx)tst-syscall-list-macros.list \
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$(objpfx)tst-syscall-list-nr.list \
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$(objpfx)tst-syscall-list-sys.list
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$(BASH) $^ $(AWK) > $@; $(evaluate-test)
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tests-special += $(objpfx)tst-glibcsyscalls.out
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# arch-syscall.h is located via the sysdeps override search path.
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$(objpfx)tst-glibcsyscalls.out: arch-syscall.h \
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../sysdeps/unix/sysv/linux/syscall-names.list
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$(sysdeps-linux-python) \
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../sysdeps/unix/sysv/linux/tst-glibcsyscalls.py \
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$(sysdeps-linux-python-cc) $< \
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../sysdeps/unix/sysv/linux/syscall-names.list \
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< /dev/null > $@ 2>&1; $(evaluate-test)
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$(objpfx)tst-glibcsyscalls.out: \
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../sysdeps/unix/sysv/linux/tst-glibcsyscalls.py \
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$(sysdeps-linux-python-deps)
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# Separate object file for access to the constant from the UAPI header.
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$(objpfx)tst-sysconf-iov_max: $(objpfx)tst-sysconf-iov_max-uapi.o
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tests-special += $(objpfx)tst-mman-consts.out
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$(objpfx)tst-mman-consts.out: ../sysdeps/unix/sysv/linux/tst-mman-consts.py
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$(sysdeps-linux-python) \
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../sysdeps/unix/sysv/linux/tst-mman-consts.py \
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$(sysdeps-linux-python-cc) \
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< /dev/null > $@ 2>&1; $(evaluate-test)
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$(objpfx)tst-mman-consts.out: $(sysdeps-linux-python-deps)
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endif # $(subdir) == misc
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ifeq ($(subdir),time)
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sysdep_headers += sys/timex.h bits/timex.h
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sysdep_routines += ntp_gettime ntp_gettimex
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endif
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ifeq ($(subdir),signal)
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tests-special += $(objpfx)tst-signal-numbers.out
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# Depending on signal.o* is a hack. What we actually want is a dependency
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# on signal.h and everything it includes. That's impractical to write
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# in this context, but signal.c includes signal.h and not much else so it'll
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# be conservatively correct.
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$(objpfx)tst-signal-numbers.out: \
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../sysdeps/unix/sysv/linux/tst-signal-numbers.py \
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$(objpfx)signal.o*
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$(sysdeps-linux-python) \
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../sysdeps/unix/sysv/linux/tst-signal-numbers.py \
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$(sysdeps-linux-python-cc) \
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< /dev/null > $@ 2>&1; $(evaluate-test)
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$(objpfx)tst-signal-numbers.out: $(sysdeps-linux-python-deps)
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endif
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ifeq ($(subdir),socket)
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sysdep_headers += net/if_ppp.h net/ppp-comp.h \
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net/ppp_defs.h net/if_arp.h net/route.h net/ethernet.h \
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net/if_slip.h net/if_packet.h net/if_shaper.h \
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bits/socket-constants.h
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sysdep_routines += cmsg_nxthdr
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CFLAGS-recvmmsg.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-sendmmsg.c = -fexceptions -fasynchronous-unwind-tables
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tests-special += $(objpfx)tst-socket-consts.out
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$(objpfx)tst-socket-consts.out: ../sysdeps/unix/sysv/linux/tst-socket-consts.py
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PYTHONPATH=../scripts \
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$(PYTHON) ../sysdeps/unix/sysv/linux/tst-socket-consts.py \
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--cc="$(CC) $(patsubst -DMODULE_NAME=%, \
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-DMODULE_NAME=testsuite, \
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$(CPPFLAGS)) -D_ISOMAC" \
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< /dev/null > $@ 2>&1; $(evaluate-test)
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endif # $(subdir) == socket
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ifeq ($(subdir),sunrpc)
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sysdep_headers += nfs/nfs.h
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endif
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ifeq ($(subdir),termios)
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sysdep_headers += termio.h
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endif
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ifeq ($(subdir),posix)
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sysdep_headers += bits/initspin.h
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sysdep_routines += sched_getcpu oldglob getcpu
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tests += tst-affinity tst-affinity-pid
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tests-static := tst-affinity-static
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tests += $(tests-static)
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CFLAGS-fork.c = $(libio-mtsafe)
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CFLAGS-getpid.o = -fomit-frame-pointer
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CFLAGS-getpid.os = -fomit-frame-pointer
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endif
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ifeq ($(subdir),inet)
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sysdep_headers += netinet/if_fddi.h netinet/if_tr.h \
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netipx/ipx.h netash/ash.h netax25/ax25.h netatalk/at.h \
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netrom/netrom.h netpacket/packet.h netrose/rose.h \
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neteconet/ec.h netiucv/iucv.h
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sysdep_routines += netlink_assert_response
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endif
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# Don't compile the ctype glue code, since there is no old non-GNU C library.
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inhibit-glue = yes
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ifeq ($(subdir),dirent)
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sysdep_routines += getdirentries getdirentries64
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tests += tst-getdents64
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# The tested readdir64 symbol was replaced in glibc 2.2.
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ifeq ($(have-GLIBC_2.1.3)$(build-shared),yesyes)
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tests += tst-readdir64-compat
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endif
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endif # $(subdir) == dirent
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ifeq ($(subdir),nis)
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CFLAGS-ypclnt.c = -DUSE_BINDINGDIR=1
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endif
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ifeq ($(subdir),io)
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sysdep_routines += xstatconv internal_statvfs \
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sync_file_range fallocate fallocate64 \
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close_nocancel fcntl_nocancel \
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open_nocancel open64_nocancel \
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openat_nocancel openat64_nocancel \
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read_nocancel pread64_nocancel \
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write_nocancel statx_cp stat_t64_cp
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sysdep_headers += bits/fcntl-linux.h
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tests += tst-fallocate tst-fallocate64 tst-o_path-locks
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endif
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ifeq ($(subdir),elf)
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sysdep-rtld-routines += dl-brk dl-sbrk dl-getcwd dl-openat64 dl-opendir
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libof-lddlibc4 = lddlibc4
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others += pldd
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install-bin += pldd
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$(objpfx)pldd: $(objpfx)xmalloc.o
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endif
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ifeq ($(subdir),rt)
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CFLAGS-mq_send.c += -fexceptions
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CFLAGS-mq_receive.c += -fexceptions
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endif
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ifeq ($(subdir),nscd)
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sysdep-CFLAGS += -DHAVE_EPOLL -DHAVE_INOTIFY -DHAVE_NETLINK
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CFLAGS-gai.c += -DNEED_NETLINK
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endif
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ifeq ($(subdir),nptl)
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tests += tst-align-clone tst-getpid1
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endif
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