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| -rw-r--r-- | exec/main.c | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/exec/main.c b/exec/main.c new file mode 100644 index 00000000..c0575113 --- /dev/null +++ b/exec/main.c @@ -0,0 +1,282 @@ +/* GNU Hurd standard exec server, main program and server mechanics. + Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc. + Written by Roland McGrath. + +This file is part of the GNU Hurd. + +The GNU Hurd is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +The GNU Hurd is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with the GNU Hurd; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include "priv.h" +#include <error.h> +#include <hurd/paths.h> +#include <hurd/startup.h> + + +bfd_arch_info_type host_bfd_arch_info; +bfd host_bfd = { arch_info: &host_bfd_arch_info }; +Elf32_Half elf_machine; /* ELF e_machine for the host. */ + +extern error_t bfd_mach_host_arch_mach (host_t host, + enum bfd_architecture *bfd_arch, + long int *bfd_machine, + Elf32_Half *elf_machine); + + +/* Trivfs hooks. */ +int trivfs_fstype = FSTYPE_MISC; +int trivfs_fsid = 0; +int trivfs_support_read = 1; +int trivfs_support_write = 1; +int trivfs_support_exec = 1; +int trivfs_allow_open = O_READ|O_WRITE|O_EXEC; + +struct port_class *trivfs_protid_portclasses[1]; +struct port_class *trivfs_cntl_portclasses[1]; +int trivfs_protid_nportclasses = 1; +int trivfs_cntl_nportclasses = 1; + +struct trivfs_control *fsys; + +char *exec_version = "0.0 pre-alpha"; +char **save_argv; + + +static int +exec_demuxer (mach_msg_header_t *inp, mach_msg_header_t *outp) +{ + extern int exec_server (mach_msg_header_t *inp, mach_msg_header_t *outp); + return exec_server (inp, outp) || trivfs_demuxer (inp, outp); +} + + +static int going_down; + +/* Clean up the storage in BOOT, which was never used. */ + +void +deadboot (void *p) +{ + struct bootinfo *boot = p; + size_t i; + + vm_deallocate (mach_task_self (), + (vm_address_t) boot->argv, boot->argvlen); + vm_deallocate (mach_task_self (), + (vm_address_t) boot->envp, boot->envplen); + + for (i = 0; i < boot->dtablesize; ++i) + mach_port_deallocate (mach_task_self (), boot->dtable[i]); + for (i = 0; i < boot->nports; ++i) + mach_port_deallocate (mach_task_self (), boot->portarray[i]); + vm_deallocate (mach_task_self (), + (vm_address_t) boot->portarray, + boot->nports * sizeof (mach_port_t)); + vm_deallocate (mach_task_self (), + (vm_address_t) boot->intarray, + boot->nints * sizeof (int)); + + if (going_down) + { + /* We are not accepting new requests, only listening + for exec_startup RPCs from tasks we already started. + See if there are any more to be answered. */ + int count = ports_count_class (execboot_portclass); + if (count == 0) + /* No more tasks starting up. No reason to live. */ + exit (0); + ports_enable_class (execboot_portclass); + } +} + + +int +main (int argc, char **argv) +{ + error_t err; + mach_port_t bootstrap; + + save_argv = argv; + + /* Put the Mach kernel's idea of what flavor of machine this is into the + fake BFD against which architecture compatibility checks are made. */ + err = bfd_mach_host_arch_mach (mach_host_self (), + &host_bfd.arch_info->arch, + &host_bfd.arch_info->mach, + &elf_machine); + if (err) + error (1, err, "Getting host architecture from Mach"); + + task_get_bootstrap_port (mach_task_self (), &bootstrap); + if (bootstrap == MACH_PORT_NULL) + error (2, 0, "Must be started as a translator"); + + /* Fetch our proc server port for easy use. If we are booting, it is not + set yet and `getproc' returns MACH_PORT_NULL; we reset PROCSERVER in + S_exec_init (below). */ + procserver = getproc (); + + port_bucket = ports_create_bucket (); + trivfs_cntl_portclasses[0] = ports_create_class (trivfs_clean_cntl, 0); + trivfs_protid_portclasses[0] = ports_create_class (trivfs_clean_protid, 0); + execboot_portclass = ports_create_class (deadboot, NULL); + + /* Reply to our parent. */ + err = trivfs_startup (bootstrap, + trivfs_cntl_portclasses[0], port_bucket, + trivfs_protid_portclasses[0], port_bucket, + &fsys); + mach_port_deallocate (mach_task_self (), bootstrap); + if (err) + error (3, err, "Contacting parent"); + + /* Launch. */ + ports_manage_port_operations_multithread (port_bucket, exec_demuxer, + 2 * 60 * 1000, 0, + 0, MACH_PORT_NULL); + + return 0; +} + + +void +trivfs_modify_stat (struct trivfs_protid *cred, struct stat *st) +{ + st->st_fstype = FSTYPE_MISC; +} + +error_t +trivfs_goaway (struct trivfs_control *fsys, int flags) +{ + int count; + + /* Stop new requests. */ + ports_inhibit_class_rpcs (trivfs_cntl_portclasses[0]); + ports_inhibit_class_rpcs (trivfs_protid_portclasses[0]); + + /* Are there any extant user ports for the /servers/exec file? */ + count = ports_count_class (trivfs_protid_portclasses[0]); + if (count == 0 || (flags & FSYS_GOAWAY_FORCE)) + { + /* No users. Disconnect from the filesystem. */ + mach_port_deallocate (mach_task_self (), fsys->underlying); + + /* Are there remaining exec_startup RPCs to answer? */ + count = ports_count_class (execboot_portclass); + if (count == 0) + /* Nope. We got no reason to live. */ + exit (0); + + /* Continue servicing tasks starting up. */ + ports_enable_class (execboot_portclass); + + /* No more communication with the parent filesystem. */ + ports_destroy_right (fsys); + going_down = 1; + + return 0; + } + else + { + /* We won't go away, so start things going again... */ + ports_enable_class (trivfs_protid_portclasses[0]); + ports_resume_class_rpcs (trivfs_cntl_portclasses[0]); + ports_resume_class_rpcs (trivfs_protid_portclasses[0]); + + return EBUSY; + } +} + +/* Attempt to set the active translator for the exec server so that + filesystems other than the bootstrap can find it. */ +void +set_active_trans () +{ + file_t execnode; + + execnode = file_name_lookup (_SERVERS_EXEC, O_NOTRANS | O_CREAT, 0666); + if (execnode == MACH_PORT_NULL) + return; + + file_set_translator (execnode, 0, FS_TRANS_SET, 0, 0, 0, + ports_get_right (fsys), MACH_MSG_TYPE_MAKE_SEND); + /* Don't deallocate EXECNODE here. If we drop the last reference, + a bug in ufs might throw away the active translator. XXX */ +} + + +/* Sent by the bootstrap filesystem after the other essential + servers have been started up. */ + +kern_return_t +S_exec_init (struct trivfs_protid *protid, + auth_t auth, process_t proc) +{ + mach_port_t host_priv, dev_master, startup; + error_t err; + + if (! protid || ! protid->isroot) + return EPERM; + + _hurd_port_set (&_hurd_ports[INIT_PORT_PROC], proc); /* Consume. */ + _hurd_port_set (&_hurd_ports[INIT_PORT_AUTH], auth); /* Consume. */ + + /* Do initial setup with the proc server. */ + _hurd_proc_init (save_argv); + + /* Set the active translator on /servers/exec. */ + set_active_trans (); + + procserver = getproc (); + + err = get_privileged_ports (&host_priv, &dev_master); + if (!err) + { + proc_register_version (procserver, host_priv, "exec", HURD_RELEASE, + exec_version); + mach_port_deallocate (mach_task_self (), dev_master); + err = proc_getmsgport (procserver, 1, &startup); + if (err) + { + mach_port_deallocate (mach_task_self (), host_priv); + host_priv = MACH_PORT_NULL; + } + } + else + host_priv = MACH_PORT_NULL; + + { + /* Have the proc server notify us when the canonical ints and ports + change. */ + + struct trivfs_protid *cred; + err = trivfs_open (fsys, 0, 0, 0, 0, 0, MACH_PORT_NULL, &cred); + assert_perror (err); + + proc_execdata_notify (procserver, ports_get_right (cred), + MACH_MSG_TYPE_MAKE_SEND); + } + + /* Call startup_essential task last; init assumes we are ready to + run once we call it. */ + if (host_priv != MACH_PORT_NULL) + { + startup_essential_task (startup, mach_task_self (), MACH_PORT_NULL, + "exec", host_priv); + mach_port_deallocate (mach_task_self (), startup); + mach_port_deallocate (mach_task_self (), host_priv); + } + + return 0; +} |