I see this bug for hppa, sparc64. I don't see it for m68k, mips, mips64, powerpc, powerpc64. Most likely because the binary values of O_CLOEXEC on hppa and sparc64 are different than on other platforms. Looking in the glibc source code:
$ grep -r 'define.*O_CLOEXEC' glibc glibc/bits/fcntl.h:# define O_CLOEXEC 0x00400000 /* Set close_on_exec. */ glibc/sysdeps/mach/hurd/bits/fcntl.h:# define O_CLOEXEC 0x00400000 /* Set FD_CLOEXEC. */ glibc/sysdeps/unix/sysv/linux/sparc/bits/fcntl.h:#define __O_CLOEXEC 0x400000 /* Set close_on_exit. */ glibc/sysdeps/unix/sysv/linux/bits/fcntl-linux.h:# define __O_CLOEXEC 02000000 glibc/sysdeps/unix/sysv/linux/bits/fcntl-linux.h:# define O_CLOEXEC __O_CLOEXEC /* Set close_on_exec. */ glibc/sysdeps/unix/sysv/linux/hppa/bits/fcntl.h:#define __O_CLOEXEC 010000000 /* Set close_on_exec. */ glibc/sysdeps/unix/sysv/linux/microblaze/bits/fcntl.h:#define __O_CLOEXEC 02000000 /* Set close_on_exec. */ glibc/sysdeps/unix/sysv/linux/alpha/bits/fcntl.h:#define __O_CLOEXEC 010000000 /* Set close_on_exec. */ glibc/sysdeps/nacl/bits/fcntl.h:# define O_CLOEXEC 02000000 /* Set close_on_exec. */ So, what's missing is probably that the O_CLOEXEC of the target platform gets mapped to O_CLOEXEC of the host platform, during the dup3 system call emulation. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1704658 Title: O_CLOEXEC not handled in dup3 system call in user mode Status in QEMU: New Bug description: In qemu user mode, for hppa and sparc64 targets, the parameter of the dup3 is not passed correctly when it contains the O_CLOEXEC flag. When the attached program runs, the expected output is: errno=9=EBADF How to reproduce on hppa: - Compile the program: hppa-linux-gnu-gcc-5 -O -Wall -static testdup3.c -o testdup3-hppa - Set environment variables for running qemu-hppa. - ~/inst-qemu/2.9.0/bin/qemu-hppa testdup3-hppa errno=22=EINVAL testdup3.c:54: assertion 'errno == EBADF' failed How to reproduce on sparc64: - Compile the program: sparc64-linux-gnu-gcc-5 -O -Wall -static testdup3.c -o testdup3-sparc64 - Set environment variables for running qemu-sparc64. - ~/inst-qemu/2.9.0/bin/qemu-sparc64 testdup3-sparc64 errno=22=EINVAL testdup3.c:54: assertion 'errno == EBADF' failed To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1704658/+subscriptions