8e38aeff17
implement shm_open(2) and shm_unlink(2) in the kernel: - Each shared memory file descriptor is associated with a swap-backed vm object which provides the backing store. Each descriptor starts off with a size of zero, but the size can be altered via ftruncate(2). The shared memory file descriptors also support fstat(2). read(2), write(2), ioctl(2), select(2), poll(2), and kevent(2) are not supported on shared memory file descriptors. - shm_open(2) and shm_unlink(2) are now implemented as system calls that manage shared memory file descriptors. The virtual namespace that maps pathnames to shared memory file descriptors is implemented as a hash table where the hash key is generated via the 32-bit Fowler/Noll/Vo hash of the pathname. - As an extension, the constant 'SHM_ANON' may be specified in place of the path argument to shm_open(2). In this case, an unnamed shared memory file descriptor will be created similar to the IPC_PRIVATE key for shmget(2). Note that the shared memory object can still be shared among processes by sharing the file descriptor via fork(2) or sendmsg(2), but it is unnamed. This effectively serves to implement the getmemfd() idea bandied about the lists several times over the years. - The backing store for shared memory file descriptors are garbage collected when they are not referenced by any open file descriptors or the shm_open(2) virtual namespace. Submitted by: dillon, peter (previous versions) Submitted by: rwatson (I based this on his version) Reviewed by: alc (suggested converting getmemfd() to shm_open())
174 lines
6.2 KiB
Makefile
174 lines
6.2 KiB
Makefile
# @(#)Makefile.inc 8.3 (Berkeley) 10/24/94
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# $FreeBSD$
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# sys sources
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.PATH: ${.CURDIR}/${MACHINE_ARCH}/sys ${.CURDIR}/sys
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# Include the generated makefile containing the *complete* list
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# of syscall names in MIASM.
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.include "${.CURDIR}/../../sys/sys/syscall.mk"
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# Include machine dependent definitions.
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#
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# MDASM names override the default syscall names in MIASM.
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# NOASM will prevent the default syscall code from being generated.
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#
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.if exists(${.CURDIR}/${MACHINE_ARCH}/sys/Makefile.inc)
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.include "${.CURDIR}/${MACHINE_ARCH}/sys/Makefile.inc"
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.endif
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# Sources common to both syscall interfaces:
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SRCS+= stack_protector.c __error.c
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.if !defined(WITHOUT_SYSCALL_COMPAT)
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SRCS+= ftruncate.c lseek.c mmap.c pread.c pwrite.c truncate.c
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.endif
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# Add machine dependent asm sources:
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SRCS+=${MDASM}
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# Look though the complete list of syscalls (MIASM) for names that are
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# not defined with machine dependent implementations (MDASM) and are
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# not declared for no generation of default code (NOASM). Add each
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# syscall that satisfies these conditions to the ASM list.
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.for _asm in ${MIASM}
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.if (${MDASM:R:M${_asm:R}} == "")
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.if (${NOASM:R:M${_asm:R}} == "")
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ASM+=$(_asm)
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.endif
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.endif
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.endfor
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OBJS+= ${ASM} ${PSEUDO}
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SASM= ${ASM:S/.o/.S/}
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SPSEUDO= ${PSEUDO:S/.o/.S/}
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SRCS+= ${SASM} ${SPSEUDO}
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SYM_MAPS+= ${.CURDIR}/sys/Symbol.map
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# Generated files
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CLEANFILES+= ${SASM} ${SPSEUDO}
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${SASM}:
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printf '#include "SYS.h"\nRSYSCALL(${.PREFIX})\n' > ${.TARGET}
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${SPSEUDO}:
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printf '#include "SYS.h"\nPSEUDO(${.PREFIX:S/_//})\n' \
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> ${.TARGET}
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MAN+= _exit.2 abort2.2 accept.2 access.2 acct.2 adjtime.2 \
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aio_cancel.2 aio_error.2 aio_read.2 aio_return.2 \
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aio_suspend.2 aio_waitcomplete.2 aio_write.2 \
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bind.2 brk.2 chdir.2 chflags.2 \
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chmod.2 chown.2 chroot.2 clock_gettime.2 close.2 \
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connect.2 dup.2 execve.2 extattr_get_file.2 \
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fcntl.2 fhopen.2 flock.2 fork.2 fsync.2 \
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getdirentries.2 getdtablesize.2 \
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getfh.2 getfsstat.2 getgid.2 getgroups.2 getitimer.2 getlogin.2 \
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getpeername.2 getpgrp.2 getpid.2 getpriority.2 getrlimit.2 \
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getrusage.2 getsid.2 getsockname.2 \
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getsockopt.2 gettimeofday.2 getuid.2 \
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intro.2 ioctl.2 issetugid.2 jail.2 kenv.2 kill.2 \
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kldfind.2 kldfirstmod.2 kldload.2 kldnext.2 kldstat.2 kldsym.2 \
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kldunload.2 kqueue.2 kse.2 ktrace.2 link.2 lio_listio.2 listen.2 \
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lseek.2 \
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madvise.2 mincore.2 minherit.2 mkdir.2 mkfifo.2 mknod.2 mlock.2 \
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mlockall.2 mmap.2 modfind.2 modnext.2 modstat.2 mount.2 mprotect.2 \
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mq_close.2 mq_getattr.2 mq_notify.2 mq_open.2 mq_receive.2 mq_send.2 \
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mq_setattr.2 \
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msync.2 munmap.2 nanosleep.2 ntp_adjtime.2 \
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nfssvc.2 open.2 pathconf.2 pipe.2 poll.2 profil.2 ptrace.2 quotactl.2 \
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read.2 readlink.2 reboot.2 recv.2 rename.2 revoke.2 rfork.2 rmdir.2 \
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rtprio.2 select.2 semctl.2 semget.2 semop.2 send.2 sendfile.2 \
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setgroups.2 setpgid.2 setregid.2 setresuid.2 setreuid.2 setsid.2 \
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setuid.2 shmat.2 shmctl.2 shmget.2 shm_open.2 shutdown.2 \
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sigaction.2 sigaltstack.2 sigpending.2 sigprocmask.2 sigqueue.2 \
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sigreturn.2 sigstack.2 sigsuspend.2 sigwait.2 sigwaitinfo.2 \
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socket.2 socketpair.2 stat.2 statfs.2 \
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sctp_generic_recvmsg.2 sctp_generic_sendmsg.2 sctp_peeloff.2 \
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swapon.2 symlink.2 sync.2 sysarch.2 syscall.2 \
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timer_create.2 timer_delete.2 timer_settime.2 \
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truncate.2 umask.2 undelete.2 \
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unlink.2 utimes.2 utrace.2 uuidgen.2 vfork.2 wait.2 write.2
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.if !defined(NO_P1003_1B)
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MAN+= sched_get_priority_max.2 sched_setparam.2 \
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sched_setscheduler.2 sched_yield.2
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.endif
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MLINKS+=access.2 eaccess.2
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MLINKS+=brk.2 sbrk.2
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MLINKS+=chdir.2 fchdir.2
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MLINKS+=chflags.2 fchflags.2 chflags.2 lchflags.2
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MLINKS+=chmod.2 fchmod.2 chmod.2 lchmod.2
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MLINKS+=chown.2 fchown.2 chown.2 lchown.2
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MLINKS+=clock_gettime.2 clock_getres.2 clock_gettime.2 clock_settime.2
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MLINKS+=dup.2 dup2.2
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MLINKS+=extattr_get_file.2 extattr.2 \
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extattr_get_file.2 extattr_delete_fd.2 \
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extattr_get_file.2 extattr_delete_file.2 \
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extattr_get_file.2 extattr_delete_list.2 \
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extattr_get_file.2 extattr_get_fd.2 \
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extattr_get_file.2 extattr_get_list.2 \
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extattr_get_file.2 extattr_list_fd.2 \
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extattr_get_file.2 extattr_list_file.2 \
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extattr_get_file.2 extattr_list_link.2 \
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extattr_get_file.2 extattr_set_fd.2 \
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extattr_get_file.2 extattr_set_file.2 \
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extattr_get_file.2 extattr_set_link.2
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MLINKS+=fhopen.2 fhstat.2 fhopen.2 fhstatfs.2
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MLINKS+=getdirentries.2 getdents.2
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MLINKS+=getfh.2 lgetfh.2
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MLINKS+=getgid.2 getegid.2
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MLINKS+=getitimer.2 setitimer.2
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MLINKS+=getlogin.2 getlogin_r.3
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MLINKS+=getlogin.2 setlogin.2
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MLINKS+=getpgrp.2 getpgid.2
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MLINKS+=getpid.2 getppid.2
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MLINKS+=getpriority.2 setpriority.2
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MLINKS+=getrlimit.2 setrlimit.2
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MLINKS+=getsockopt.2 setsockopt.2
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MLINKS+=gettimeofday.2 settimeofday.2
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MLINKS+=getuid.2 geteuid.2
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MLINKS+=intro.2 errno.2
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MLINKS+=jail.2 jail_attach.2
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MLINKS+=kqueue.2 kevent.2
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MLINKS+=kse.2 kse_create.2 kse.2 kse_exit.2 kse.2 kse_release.2 \
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kse.2 kse_switchin.2 kse.2 kse_thr_interrupt.2 kse.2 kse_wakeup.2
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MLINKS+=madvise.2 posix_madvise.2
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MLINKS+=mlock.2 munlock.2
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MLINKS+=mlockall.2 munlockall.2
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MLINKS+=modnext.2 modfnext.2
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MLINKS+=mount.2 nmount.2 mount.2 unmount.2
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MLINKS+=mq_send.2 mq_timedsend.2
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MLINKS+=mq_receive.2 mq_timedreceive.2
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MLINKS+=ntp_adjtime.2 ntp_gettime.2
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MLINKS+=pathconf.2 fpathconf.2
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MLINKS+=read.2 pread.2 read.2 readv.2 read.2 preadv.2
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MLINKS+=recv.2 recvfrom.2 recv.2 recvmsg.2
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MLINKS+=select.2 FD_CLR.3 select.2 FD_ISSET.3 select.2 FD_SET.3 \
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select.2 FD_ZERO.3
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MLINKS+=send.2 sendmsg.2 send.2 sendto.2
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MLINKS+=setpgid.2 setpgrp.2
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MLINKS+=setresuid.2 setresgid.2 setresuid.2 getresuid.2 setresuid.2 getresgid.2
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MLINKS+=setuid.2 setegid.2 setuid.2 seteuid.2 setuid.2 setgid.2
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MLINKS+=shmat.2 shmdt.2
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MLINKS+=shm_open.2 shm_unlink.2
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MLINKS+=sigwaitinfo.2 sigtimedwait.2
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MLINKS+=stat.2 fstat.2 stat.2 lstat.2
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MLINKS+=statfs.2 fstatfs.2
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MLINKS+=syscall.2 __syscall.2
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MLINKS+=swapon.2 swapoff.2
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MLINKS+=timer_settime.2 timer_gettime.2 timer_settime.2 timer_getoverrun.2
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MLINKS+=truncate.2 ftruncate.2
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MLINKS+=utimes.2 futimes.2 utimes.2 lutimes.2
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MLINKS+=wait.2 wait3.2 wait.2 wait4.2 wait.2 waitpid.2
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MLINKS+=write.2 pwrite.2 write.2 writev.2 write.2 pwritev.2
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.if !defined(NO_P1003_1B)
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MLINKS+=sched_get_priority_max.2 sched_get_priority_min.2 \
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sched_get_priority_max.2 sched_rr_get_interval.2
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MLINKS+=sched_setparam.2 sched_getparam.2
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MLINKS+=sched_setscheduler.2 sched_getscheduler.2
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.endif
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