| Commit message (Collapse) | Author | Age | Files | Lines |
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Now that the RPCs have const, this forces us cleaning our const-meant
functions.
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If file_name_exec is not given, check_hashbang will try to locate the
file. If argv[0] contains a '/', the file path is assumed to be
absolute and it will try to open the file. Otherwise, the file is
searched in the PATH. In either case, the resulting file identity port
is compared to the identity port of the original file handle passed to
check_hashbang.
exec_paths_exec.patch explicitly provides the script files path in
file_name_exec. According to the comment, if this path is provided, it
is assumed to be the path to the script file and no attempt at
locating the script file is done. However, the identity ports are
still compared. This cannot succeed if fakeroot or chroot is used,
because the process doing the exec and thus the initial file lookup is
running in the chrooted environment, while the exec server is not.
Fix this by skipping the identity test if file_name_exec is provided.
* exec/hashexec.c (check_hashbang): Skip the file identity test if the
file_name_exec is provided.
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* hurd/fs.defs (file_exec): Deprecate in favor of...
(file_exec_paths): ...this new RPC.
* TODO: Update.
* doc/hurd.texi: Update RPC name.
* hurd/hurd_types.h: Update RPC name.
* libdiskfs/boot-start.c: Update RPC name.
* configure.ac: Check for presence of RPC stubs file_exec_paths exec_exec_paths.
* exec/hashexec.c (check_hashbang): When file_exec_paths is available, use it
instead of file_exec.
* startup/startup.c (run, run_for_real, start_child): Likewise.
* utils/login.c (main): Likewise.
* libfshelp/start-translator-long.c (fshelp_start_translator_long): Likewise.
* libdiskfs/file-exec.c (diskfs_S_file_exec): Move code to
new function diskfs_S_file_exec_paths and call it.
(diskfs_S_file_exec_paths): New function, use exec_exec_paths when available
instead of exec_exec
* libnetfs/file-exec.c (netfs_S_file_exec, netfs_S_file_exec_paths): Likewise.
* trans/fakeroot.c (netfs_S_file_exec, netfs_S_file_exec_paths): Likewise.
* libtrivfs/file-exec.c (trivfs_S_file_exec_paths): New function.
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* hurd/exec.defs (exec_exec): Label as deprecated.
(exec_exec_paths): New RPC.
* doc/hurd.texi: Update accordingly.
* exec/hashexec.c (check_hashbang): Add file_name_exec argument.
Don't guess the file name if file_name_exec is set.
* exec/priv.h (check_hashbang): Add path argument.
* exec/exec.c (S_exec_exec): Label as deprecated.
(S_exec_exec_paths): New function.
(do_exec): Add path and abspath arguments, pass path to check_hashbang.
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* boot/boot.c: Replace bcopy with memcpy or memmove as appropriate.
* exec/hashexec.c: Likewise.
* libps/proclist.c: Likewise, but also fix the amount of data copied.
* libps/procstat.c: Likewise.
* libps/spec.c: Likewise.
* libshouldbeinlibc/cacheq.c: Likewise.
* libshouldbeinlibc/idvec.c: Likewise.
* libshouldbeinlibc/timefmt.c: Likewise.
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or called with a small array.
This notably happens when using a sub-exec, see BZ #48919.
* exec/hashexec.c (check_hashbang): Check std_nports before accessing
std_ports.
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* exec/hashexec.c (check_hashbang): Unmap command arguments.
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Makefiles, headers, types, macros and function calls are renamed where
appropriate.
Most of this work was done by Barry deFreese and Thomas DiModica.
* auth/Makefile: Switch from cthreads to pthreads.
* auth/auth.c: Likewise.
* boot/Makefile: Likewise.
* boot/boot.c: Likewise.
* boot/ux.c: Likewise.
* console-client/Makefile: Likewise.
* console-client/console.c: Likewise.
* console-client/driver.c: Likewise.
* console-client/driver.h: Likewise.
* console-client/generic-speaker.c: Likewise.
* console-client/kbd-repeat.c: Likewise.
* console-client/ncursesw.c: Likewise.
* console-client/pc-kbd.c: Likewise.
* console-client/pc-mouse.c: Likewise.
* console-client/timer.c: Likewise.
* console-client/trans.c: Likewise.
* console-client/vga.c: Likewise.
* console/Makefile: Likewise.
* console/console.c: Likewise.
* console/display.c: Likewise.
* console/input.c: Likewise.
* console/pager.c: Likewise.
* defpager/backing.c: Likewise.
* exec/Makefile: Likewise.
* exec/exec.c: Likewise.
* exec/hashexec.c: Likewise.
* exec/priv.h: Likewise.
* ext2fs/Makefile: Likewise.
* ext2fs/balloc.c: Likewise.
* ext2fs/dir.c: Likewise.
* ext2fs/ext2fs.c: Likewise.
* ext2fs/ext2fs.h: Likewise.
* ext2fs/ialloc.c: Likewise.
* ext2fs/inode.c: Likewise.
* ext2fs/msg.c: Likewise.
* ext2fs/pager.c: Likewise.
* ext2fs/pokel.c: Likewise.
* ext2fs/storeinfo.c: Likewise.
* ext2fs/truncate.c: Likewise.
* fatfs/Makefile: Likewise.
* fatfs/dir.c: Likewise.
* fatfs/fat.c: Likewise.
* fatfs/fatfs.h: Likewise.
* fatfs/inode.c: Likewise.
* fatfs/main.c: Likewise.
* fatfs/pager.c: Likewise.
* fatfs/virt-inode.c: Likewise.
* ftpfs/Makefile: Likewise.
* ftpfs/ccache.c: Likewise.
* ftpfs/ccache.h: Likewise.
* ftpfs/conn.c: Likewise.
* ftpfs/dir.c: Likewise.
* ftpfs/fs.c: Likewise.
* ftpfs/ftpfs.c: Likewise.
* ftpfs/ftpfs.h: Likewise.
* ftpfs/ncache.c: Likewise.
* ftpfs/netfs.c: Likewise.
* ftpfs/node.c: Likewise.
* hostmux/Makefile: Likewise.
* hostmux/hostmux.h: Likewise.
* hostmux/mux.c: Likewise.
* hostmux/node.c: Likewise.
* hostmux/stubs.c: Likewise.
* hurd/shared.h: Likewise.
* isofs/Makefile: Likewise.
* isofs/inode.c: Likewise.
* isofs/lookup.c: Likewise.
* isofs/main.c: Likewise.
* isofs/pager.c: Likewise.
* libcons/Makefile: Likewise.
* libcons/cons-switch.c: Likewise.
* libcons/cons.h: Likewise.
* libcons/dir-changed.c: Likewise.
* libcons/file-changed.c: Likewise.
* libcons/init-init.c: Likewise.
* libcons/vcons-close.c: Likewise.
* libcons/vcons-input.c: Likewise.
* libcons/vcons-move-mouse.c: Likewise.
* libcons/vcons-open.c: Likewise.
* libcons/vcons-scrollback.c: Likewise.
* libdiskfs/Makefile: Likewise.
* libdiskfs/boot-start.c: Likewise.
* libdiskfs/dead-name.c: Likewise.
* libdiskfs/dir-chg.c: Likewise.
* libdiskfs/dir-link.c: Likewise.
* libdiskfs/dir-lookup.c: Likewise.
* libdiskfs/dir-mkdir.c: Likewise.
* libdiskfs/dir-mkfile.c: Likewise.
* libdiskfs/dir-readdir.c: Likewise.
* libdiskfs/dir-rename.c: Likewise.
* libdiskfs/dir-renamed.c: Likewise.
* libdiskfs/dir-rmdir.c: Likewise.
* libdiskfs/dir-unlink.c: Likewise.
* libdiskfs/disk-pager.c: Likewise.
* libdiskfs/diskfs-pager.h: Likewise.
* libdiskfs/diskfs.h: Likewise.
* libdiskfs/file-access.c: Likewise.
* libdiskfs/file-chg.c: Likewise.
* libdiskfs/file-exec.c: Likewise.
* libdiskfs/file-get-fs-opts.c: Likewise.
* libdiskfs/file-get-trans.c: Likewise.
* libdiskfs/file-get-transcntl.c: Likewise.
* libdiskfs/file-getcontrol.c: Likewise.
* libdiskfs/file-getfh.c: Likewise.
* libdiskfs/file-lock-stat.c: Likewise.
* libdiskfs/file-lock.c: Likewise.
* libdiskfs/file-reparent.c: Likewise.
* libdiskfs/file-set-trans.c: Likewise.
* libdiskfs/file-sync.c: Likewise.
* libdiskfs/file-syncfs.c: Likewise.
* libdiskfs/fsys-getroot.c: Likewise.
* libdiskfs/fsys-options.c: Likewise.
* libdiskfs/fsys-syncfs.c: Likewise.
* libdiskfs/ifsock.c: Likewise.
* libdiskfs/init-first.c: Likewise.
* libdiskfs/init-init.c: Likewise.
* libdiskfs/init-startup.c: Likewise.
* libdiskfs/io-duplicate.c: Likewise.
* libdiskfs/io-get-conch.c: Likewise.
* libdiskfs/io-identity.c: Likewise.
* libdiskfs/io-map-cntl.c: Likewise.
* libdiskfs/io-map.c: Likewise.
* libdiskfs/io-modes-get.c: Likewise.
* libdiskfs/io-modes-off.c: Likewise.
* libdiskfs/io-modes-on.c: Likewise.
* libdiskfs/io-modes-set.c: Likewise.
* libdiskfs/io-owner-get.c: Likewise.
* libdiskfs/io-owner-mod.c: Likewise.
* libdiskfs/io-prenotify.c: Likewise.
* libdiskfs/io-read.c: Likewise.
* libdiskfs/io-readable.c: Likewise.
* libdiskfs/io-reauthenticate.c: Likewise.
* libdiskfs/io-rel-conch.c: Likewise.
* libdiskfs/io-restrict-auth.c: Likewise.
* libdiskfs/io-revoke.c: Likewise.
* libdiskfs/io-seek.c: Likewise.
* libdiskfs/io-sigio.c: Likewise.
* libdiskfs/io-stat.c: Likewise.
* libdiskfs/io-write.c: Likewise.
* libdiskfs/lookup.c: Likewise.
* libdiskfs/name-cache.c: Likewise.
* libdiskfs/node-drop.c: Likewise.
* libdiskfs/node-make.c: Likewise.
* libdiskfs/node-nput.c: Likewise.
* libdiskfs/node-nputl.c: Likewise.
* libdiskfs/node-nref.c: Likewise.
* libdiskfs/node-nrefl.c: Likewise.
* libdiskfs/node-nrele.c: Likewise.
* libdiskfs/node-nrelel.c: Likewise.
* libdiskfs/peropen-rele.c: Likewise.
* libdiskfs/priv.h: Likewise.
* libdiskfs/shutdown.c: Likewise.
* libdiskfs/sync-interval.c: Likewise.
* libfshelp/Makefile: Likewise.
* libfshelp/fetch-root.c: Likewise.
* libfshelp/fshelp.h: Likewise.
* libfshelp/get-identity.c: Likewise.
* libfshelp/lock-acquire.c: Likewise.
* libfshelp/lock-init.c: Likewise.
* libfshelp/locks.h: Likewise.
* libfshelp/set-active.c: Likewise.
* libfshelp/trans.h: Likewise.
* libfshelp/transbox-init.c: Likewise.
* libiohelp/Makefile: Likewise.
* libiohelp/get_conch.c: Likewise.
* libiohelp/handle_io_release_conch.c: Likewise.
* libiohelp/initialize_conch.c: Likewise.
* libiohelp/iohelp.h: Likewise.
* libiohelp/verify_user_conch.c: Likewise.
* libnetfs/Makefile: Likewise.
* libnetfs/dir-lookup.c: Likewise.
* libnetfs/dir-mkdir.c: Likewise.
* libnetfs/dir-mkfile.c: Likewise.
* libnetfs/dir-readdir.c: Likewise.
* libnetfs/dir-rmdir.c: Likewise.
* libnetfs/dir-unlink.c: Likewise.
* libnetfs/drop-node.c: Likewise.
* libnetfs/file-chauthor.c: Likewise.
* libnetfs/file-check-access.c: Likewise.
* libnetfs/file-chflags.c: Likewise.
* libnetfs/file-chmod.c: Likewise.
* libnetfs/file-chown.c: Likewise.
* libnetfs/file-exec.c: Likewise.
* libnetfs/file-get-storage-info.c: Likewise.
* libnetfs/file-get-translator.c: Likewise.
* libnetfs/file-lock-stat.c: Likewise.
* libnetfs/file-lock.c: Likewise.
* libnetfs/file-reparent.c: Likewise.
* libnetfs/file-set-size.c: Likewise.
* libnetfs/file-set-translator.c: Likewise.
* libnetfs/file-statfs.c: Likewise.
* libnetfs/file-sync.c: Likewise.
* libnetfs/file-syncfs.c: Likewise.
* libnetfs/file-utimes.c: Likewise.
* libnetfs/fsys-getroot.c: Likewise.
* libnetfs/fsys-set-options.c: Likewise.
* libnetfs/init-init.c: Likewise.
* libnetfs/io-clear-some-openmodes.c: Likewise.
* libnetfs/io-duplicate.c: Likewise.
* libnetfs/io-get-openmodes.c: Likewise.
* libnetfs/io-get-owner.c: Likewise.
* libnetfs/io-identity.c: Likewise.
* libnetfs/io-mod-owner.c: Likewise.
* libnetfs/io-read.c: Likewise.
* libnetfs/io-readable.c: Likewise.
* libnetfs/io-reauthenticate.c: Likewise.
* libnetfs/io-restrict-auth.c: Likewise.
* libnetfs/io-revoke.c: Likewise.
* libnetfs/io-seek.c: Likewise.
* libnetfs/io-set-all-openmodes.c: Likewise.
* libnetfs/io-set-some-openmodes.c: Likewise.
* libnetfs/io-stat.c: Likewise.
* libnetfs/io-write.c: Likewise.
* libnetfs/make-node.c: Likewise.
* libnetfs/netfs.h: Likewise.
* libnetfs/nput.c: Likewise.
* libnetfs/nref.c: Likewise.
* libnetfs/nrele.c: Likewise.
* libnetfs/release-peropen.c: Likewise.
* libnetfs/shutdown.c: Likewise.
* libpager/Makefile: Likewise.
* libpager/chg-compl.c: Likewise.
* libpager/clean.c: Likewise.
* libpager/data-request.c: Likewise.
* libpager/data-return.c: Likewise.
* libpager/data-unlock.c: Likewise.
* libpager/inhibit-term.c: Likewise.
* libpager/lock-completed.c: Likewise.
* libpager/lock-object.c: Likewise.
* libpager/mark-error.c: Likewise.
* libpager/no-senders.c: Likewise.
* libpager/object-init.c: Likewise.
* libpager/object-terminate.c: Likewise.
* libpager/offer-page.c: Likewise.
* libpager/pager-attr.c: Likewise.
* libpager/pager-create.c: Likewise.
* libpager/pager-shutdown.c: Likewise.
* libpager/priv.h: Likewise.
* libpager/seqnos.c: Likewise.
* libpipe/Makefile: Likewise.
* libpipe/pipe.c: Likewise.
* libpipe/pipe.h: Likewise.
* libports/Makefile: Likewise.
* libports/begin-rpc.c: Likewise.
* libports/bucket-iterate.c: Likewise.
* libports/claim-right.c: Likewise.
* libports/class-iterate.c: Likewise.
* libports/complete-deallocate.c: Likewise.
* libports/count-bucket.c: Likewise.
* libports/count-class.c: Likewise.
* libports/create-bucket.c: Likewise.
* libports/create-internal.c: Likewise.
* libports/destroy-right.c: Likewise.
* libports/enable-bucket.c: Likewise.
* libports/enable-class.c: Likewise.
* libports/end-rpc.c: Likewise.
* libports/get-right.c: Likewise.
* libports/import-port.c: Likewise.
* libports/inhibit-all-rpcs.c: Likewise.
* libports/inhibit-bucket-rpcs.c: Likewise.
* libports/inhibit-class-rpcs.c: Likewise.
* libports/inhibit-port-rpcs.c: Likewise.
* libports/init.c: Likewise.
* libports/interrupt-notified-rpcs.c: Likewise.
* libports/interrupt-on-notify.c: Likewise.
* libports/interrupt-operation.c: Likewise.
* libports/interrupt-rpcs.c: Likewise.
* libports/interrupted.c: Likewise.
* libports/lookup-port.c: Likewise.
* libports/manage-multithread.c: Likewise.
* libports/no-senders.c: Likewise.
* libports/port-deref-weak.c: Likewise.
* libports/port-deref.c: Likewise.
* libports/port-ref-weak.c: Likewise.
* libports/port-ref.c: Likewise.
* libports/ports.h: Likewise.
* libports/reallocate-from-external.c: Likewise.
* libports/reallocate-port.c: Likewise.
* libports/resume-all-rpcs.c: Likewise.
* libports/resume-bucket-rpcs.c: Likewise.
* libports/resume-class-rpcs.c: Likewise.
* libports/resume-port-rpcs.c: Likewise.
* libports/stubs.c: Likewise.
* libports/transfer-right.c: Likewise.
* libstore/Makefile: Likewise.
* libstore/gunzip.c: Likewise.
* libstore/part.c: Likewise.
* libstore/unzipstore.c: Likewise.
* libthreads/Makefile: Likewise.
* libtreefs/dir-lookup.c: Likewise.
* libtreefs/fsys-getroot.c: Likewise.
* libtreefs/fsys-hooks.c: Likewise.
* libtreefs/fsys.c: Likewise.
* libtreefs/trans-help.c: Likewise.
* libtreefs/trans-start.c: Likewise.
* libtreefs/treefs.h: Likewise.
* libtrivfs/cntl-create.c: Likewise.
* libtrivfs/dyn-classes.c: Likewise.
* libtrivfs/io-reauthenticate.c: Likewise.
* libtrivfs/io-restrict-auth.c: Likewise.
* libtrivfs/protid-clean.c: Likewise.
* libtrivfs/protid-dup.c: Likewise.
* libtrivfs/trivfs.h: Likewise.
* mach-defpager/Makefile: Likewise.
* mach-defpager/default_pager.c: Likewise.
* mach-defpager/kalloc.c: Likewise.
* mach-defpager/main.c: Likewise.
* nfs/Makefile: Likewise.
* nfs/cache.c: Likewise.
* nfs/main.c: Likewise.
* nfs/mount.c: Likewise.
* nfs/name-cache.c: Likewise.
* nfs/nfs.h: Likewise.
* nfs/ops.c: Likewise.
* nfs/rpc.c: Likewise.
* nfsd/Makefile: Likewise.
* nfsd/cache.c: Likewise.
* nfsd/loop.c: Likewise.
* nfsd/main.c: Likewise.
* nfsd/nfsd.h: Likewise.
* pfinet/Makefile: Likewise.
* pfinet/ethernet.c: Likewise.
* pfinet/glue-include/asm/spinlock.h: Likewise.
* pfinet/glue-include/linux/interrupt.h: Likewise.
* pfinet/glue-include/linux/sched.h: Likewise.
* pfinet/glue-include/linux/timer.h: Likewise.
* pfinet/glue-include/linux/wait.h: Likewise.
* pfinet/iioctl-ops.c: Likewise.
* pfinet/io-ops.c: Likewise.
* pfinet/kmem_cache.c: Likewise.
* pfinet/main.c: Likewise.
* pfinet/options.c: Likewise.
* pfinet/pfinet-ops.c: Likewise.
* pfinet/pfinet.h: Likewise.
* pfinet/sched.c: Likewise.
* pfinet/socket-ops.c: Likewise.
* pfinet/socket.c: Likewise.
* pfinet/timer-emul.c: Likewise.
* pfinet/tunnel.c: Likewise.
* pflocal/Makefile: Likewise.
* pflocal/connq.c: Likewise.
* pflocal/io.c: Likewise.
* pflocal/sock.c: Likewise.
* pflocal/sock.h: Likewise.
* pflocal/socket.c: Likewise.
* pflocal/sserver.c: Likewise.
* proc/Makefile: Likewise.
* proc/info.c: Likewise.
* proc/main.c: Likewise.
* proc/mgt.c: Likewise.
* proc/msg.c: Likewise.
* proc/proc.h: Likewise.
* proc/stubs.c: Likewise.
* proc/wait.c: Likewise.
* storeio/Makefile: Likewise.
* storeio/dev.c: Likewise.
* storeio/dev.h: Likewise.
* storeio/open.c: Likewise.
* storeio/open.h: Likewise.
* storeio/pager.c: Likewise.
* storeio/storeio.c: Likewise.
* term/Makefile: Likewise.
* term/devio.c: Likewise.
* term/hurdio.c: Likewise.
* term/main.c: Likewise.
* term/munge.c: Likewise.
* term/ptyio.c: Likewise.
* term/term.h: Likewise.
* term/users.c: Likewise.
* tmpfs/Makefile: Likewise.
* tmpfs/dir.c: Likewise.
* tmpfs/node.c: Likewise.
* tmpfs/tmpfs.c: Likewise.
* tmpfs/tmpfs.h: Likewise.
* trans/Makefile: Likewise.
* trans/fakeroot.c: Likewise.
* trans/fifo.c: Likewise.
* trans/hello-mt.c: Likewise.
* trans/new-fifo.c: Likewise.
* trans/streamio.c: Likewise.
* ufs/Makefile: Likewise.
* ufs/alloc.c: Likewise.
* ufs/dir.c: Likewise.
* ufs/hyper.c: Likewise.
* ufs/inode.c: Likewise.
* ufs/main.c: Likewise.
* ufs/pager.c: Likewise.
* ufs/pokeloc.c: Likewise.
* ufs/sizes.c: Likewise.
* ufs/ufs.h: Likewise.
* usermux/Makefile: Likewise.
* usermux/mux.c: Likewise.
* usermux/node.c: Likewise.
* usermux/usermux.h: Likewise.
* utils/Makefile: Likewise.
* utils/fakeauth.c: Likewise.
* utils/rpctrace.c: Likewise.
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* exec/hashexec.c (check_hashbang): Set `e->error' to 0 before
calling map(). On error, check `e->error' instead of `errno', and
default `e->error' to ENOEXEC.
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* hashexec.c (check_hashbang): Fix fs id port arg in io_identity call.
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* hashexec.c (check_hashbang): Count characters in interp
correctly. Fix from Kalle Olavi Niemitalo <tosi@stekt.oulu.fi>.
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* hashexec.c (check_hashbang): Use strpbrk directly instead of strsep.
Fix up INTERP_LEN properly in the no-argument case.
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* main.c (S_exec_init): Don't use MOVE_SEND in Hurd RPC.
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* hashexec.c (check_hashbang): Fix up multiple fencepost brainos.
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* hashexec.c (check_hashbang): Fix fencepost error in last change.
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* exec.c (map): Made global.
* priv.h: Declare it.
(map_fsize, map_vsize): New macros for accessing state set up by map.
* hashexec.c (check_hashbang): Use map and copying operations rather
than stdio to extract the first line from the file. Move finish call
to immediately after reading the line.
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* hashexec.c (check_hashbang: user_fd): Add a user ref to DTABLE[FD]
send right, because caller (hurd_file_name_lookup internals) will
consume one.
* hashexec.c (check_hashbang): When dealloc'ing DTABLE ports,
optimize out syscall for null ports.
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* exec.c (load_section): Use mmap instead of vm_allocate when
allocating in mach_task_self ().
(servercopy): Likewise.
(do_exec): Likewise.
* hashexec.c (check_hashbang): Likewise.
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* core.c (core_dump_task): Use munmap instead of vm_deallocate,
when it's from our own task.
* elfcore.c: Likewise.
* exec.c (load_section): Likewise.
(map): Likewise.
(close_exec_stream): Likewise.
(finish_mapping): Likewise.
(load): Likewise.
(do_exec): Likewise.
(S_exec_setexecdata): Likewise.
* hashexec.c (check_hashbang): Likewise.
* main.c (deadboot): Likewise.
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* hashexec.c (check_hashbang): Fix bug in last change.
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* hashexec.c (check_hashbang): Trim trailing blanks after interpreter
argument.
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* hashexec.c (check_hashbang): Fix typo: interplen -> interp_len.
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* hashexec.c: Use mach_* instead of __mach_*.
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* hashexec.c (check_hashbang): Keep INTERP_LEN with the correct
value (bytes of memory holding INTERP) for later use.
(check_hashbang: setup_args): Set argv[0] from the interpreter
name, not copied from the existing command line.
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`preempter' -> `preemptor'.
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(check_hashbang): Pass 0 for new LOOKUP arg to hurd_file_name_lookup.
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auth_user_authenticate inerface.
(check_hashbang) [setup_args/search_path]: Declare PATH to be `char const *'.
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search ourselves, and get rid of LOOKUP_CWDIR & associated logic.
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When using executable name found on the path, don't return alloca()ed
memory from search_path(); use malloc() instead.
Use envz_get() to search the environment.
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hurd_catch_signal instead of old preemption interface.
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the contents.
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volatile.
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(check_hashbang): Fixed PATH searching in script name guessing.
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of the script before resorting to /dev/fd.
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