e01f79e412
This patch consolidates the shmctl Linux implementation in only one default file, sysdeps/unix/sysv/linux/shmctl.c. If tries to use the direct syscall if it is supported, otherwise will use the old ipc multiplex mechanism. The patch also simplify header inclusion and reorganize internal compat symbol to be built only if old ipc is defined. Checked on x86_64, i686, powerpc64le, aarch64, and armhf. * sysdeps/unix/sysv/linux/alpha/Makefile (sysdeps_routines): Remove oldshmctl. * sysdeps/unix/sysv/linux/alpha/syscalls.list (shmctl): Remove. * sysdeps/unix/sysv/linux/arm/syscalls.list (shmctl): Likewise. * sysdeps/unix/sysv/linux/generic/syscalls.list (shmctl): Likewise. * sysdeps/unix/sysv/linux/hppa/syscalls.list (shmctl): Likewise. * sysdeps/unix/sysv/linux/ia64/syscalls.list (shmctl): Likewise. * sysdeps/unix/sysv/linux/microblaze/syscalls.list (shmctl): Likewise. * sysdeps/unix/sysv/linux/mips/mips64/syscalls.list (shmctl): Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/syscalls.list (shmctl): Likewise. * sysdeps/unix/sysv/linux/x86_64/syscalls.list (shmctl): Likewise. * sysdeps/unix/sysv/linux/alpha/shmctl.c: Remove file. * sysdeps/unix/sysv/linux/arm/shmctl.c: Likewise. * sysdeps/unix/sysv/linux/microblaze/shmctl.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/shmctl.c: Use default implementation. * sysdeps/unix/sysv/linux/shmctl.c (__new_shmctl): Use shmctl syscall if it is defined.
This hierarchy supports Linux systems using the new asm-generic/unistd.h, which removes many familiar old syscalls. For example, to implement open(), newer Linux architectures require glibc to invoke the __NR_openat syscall with AT_FDCWD. This hierarchy provides all those implementations. It also provides support for 32-bit platforms using the 64-bit kernel syscall APIs, as the 32-bit ones are no longer provided. Note that newer ILP32 environments (x32 or AArch64:ILP32, for example) are converting to use more 64-bit types in kernel syscalls, so that aspect of this support is in more flux as of this writing.