647 lines
17 KiB
C
647 lines
17 KiB
C
/* This file contains a collection of miscellaneous procedures. Some of them
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* perform simple system calls. Some others do a little part of system calls
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* that are mostly performed by the Memory Manager.
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*
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* The entry points into this file are
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* do_dup: perform the DUP system call
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* do_fcntl: perform the FCNTL system call
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* do_sync: perform the SYNC system call
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* do_fsync: perform the FSYNC system call
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* do_reboot: sync disks and prepare for shutdown
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* do_fork: adjust the tables after MM has performed a FORK system call
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* do_exec: handle files with FD_CLOEXEC on after MM has done an EXEC
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* do_exit: a process has exited; note that in the tables
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* do_set: set uid or gid for some process
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* do_revive: revive a process that was waiting for something (e.g. TTY)
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* do_svrctl: file system control
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* do_getsysinfo: request copy of FS data structure
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* pm_dumpcore: create a core dump
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*/
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#include "fs.h"
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#include <fcntl.h>
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#include <assert.h>
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#include <unistd.h> /* cc runs out of memory with unistd.h :-( */
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#include <minix/callnr.h>
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#include <minix/safecopies.h>
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#include <minix/endpoint.h>
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#include <minix/com.h>
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#include <minix/u64.h>
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#include <sys/ptrace.h>
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#include <sys/svrctl.h>
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#include "file.h"
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#include "fproc.h"
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#include "param.h"
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#include <minix/vfsif.h>
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#include "vnode.h"
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#include "vmnt.h"
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#define CORE_NAME "core"
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#define CORE_MODE 0777 /* mode to use on core image files */
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#if ENABLE_SYSCALL_STATS
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PUBLIC unsigned long calls_stats[NCALLS];
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#endif
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FORWARD _PROTOTYPE( void free_proc, (struct fproc *freed, int flags));
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/*
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FORWARD _PROTOTYPE( int dumpcore, (int proc_e, struct mem_map *seg_ptr));
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FORWARD _PROTOTYPE( int write_bytes, (struct inode *rip, off_t off,
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char *buf, size_t bytes));
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FORWARD _PROTOTYPE( int write_seg, (struct inode *rip, off_t off, int proc_e,
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int seg, off_t seg_off, phys_bytes seg_bytes));
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*/
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#define FP_EXITING 1
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/*===========================================================================*
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* do_getsysinfo *
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*===========================================================================*/
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PUBLIC int do_getsysinfo()
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{
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struct fproc *proc_addr;
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vir_bytes src_addr, dst_addr;
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size_t len;
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int s;
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if (!super_user)
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{
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printf("FS: unauthorized call of do_getsysinfo by proc %d\n", who_e);
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return(EPERM); /* only su may call do_getsysinfo. This call may leak
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* information (and is not stable enough to be part
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* of the API/ABI).
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*/
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}
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switch(m_in.info_what) {
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case SI_PROC_ADDR:
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proc_addr = &fproc[0];
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src_addr = (vir_bytes) &proc_addr;
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len = sizeof(struct fproc *);
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break;
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case SI_PROC_TAB:
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src_addr = (vir_bytes) fproc;
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len = sizeof(struct fproc) * NR_PROCS;
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break;
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case SI_DMAP_TAB:
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src_addr = (vir_bytes) dmap;
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len = sizeof(struct dmap) * NR_DEVICES;
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break;
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#if ENABLE_SYSCALL_STATS
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case SI_CALL_STATS:
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src_addr = (vir_bytes) calls_stats;
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len = sizeof(calls_stats);
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break;
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#endif
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default:
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return(EINVAL);
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}
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dst_addr = (vir_bytes) m_in.info_where;
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if (OK != (s=sys_datacopy(SELF, src_addr, who_e, dst_addr, len)))
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return(s);
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return(OK);
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}
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/*===========================================================================*
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* do_dup *
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*===========================================================================*/
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PUBLIC int do_dup()
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{
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/* Perform the dup(fd) or dup2(fd,fd2) system call. These system calls are
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* obsolete. In fact, it is not even possible to invoke them using the
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* current library because the library routines call fcntl(). They are
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* provided to permit old binary programs to continue to run.
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*/
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register int rfd;
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register struct filp *f;
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struct filp *dummy;
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int r;
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/* Is the file descriptor valid? */
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rfd = m_in.fd & ~DUP_MASK; /* kill off dup2 bit, if on */
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if ((f = get_filp(rfd)) == NIL_FILP) return(err_code);
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/* Distinguish between dup and dup2. */
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if (m_in.fd == rfd) { /* bit not on */
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/* dup(fd) */
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if ( (r = get_fd(0, 0, &m_in.fd2, &dummy)) != OK) return(r);
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} else {
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/* dup2(fd, fd2) */
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if (m_in.fd2 < 0 || m_in.fd2 >= OPEN_MAX) return(EBADF);
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if (rfd == m_in.fd2) return(m_in.fd2); /* ignore the call: dup2(x, x) */
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m_in.fd = m_in.fd2; /* prepare to close fd2 */
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(void) do_close(); /* cannot fail */
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}
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/* Success. Set up new file descriptors. */
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f->filp_count++;
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fp->fp_filp[m_in.fd2] = f;
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FD_SET(m_in.fd2, &fp->fp_filp_inuse);
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return(m_in.fd2);
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}
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/*===========================================================================*
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* do_fcntl *
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*===========================================================================*/
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PUBLIC int do_fcntl()
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{
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/* Perform the fcntl(fd, request, ...) system call. */
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register struct filp *f;
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int new_fd, r, fl;
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long cloexec_mask; /* bit map for the FD_CLOEXEC flag */
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long clo_value; /* FD_CLOEXEC flag in proper position */
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struct filp *dummy;
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/* Is the file descriptor valid? */
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if ((f = get_filp(m_in.fd)) == NIL_FILP) {
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/*printf("VFSfcntl: invalid filedesc %d\n", m_in.fd); */
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return(err_code);
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}
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switch (m_in.request) {
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case F_DUPFD:
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/* This replaces the old dup() system call. */
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if (m_in.addr < 0 || m_in.addr >= OPEN_MAX) return(EINVAL);
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if ((r = get_fd(m_in.addr, 0, &new_fd, &dummy)) != OK) return(r);
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f->filp_count++;
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fp->fp_filp[new_fd] = f;
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return(new_fd);
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case F_GETFD:
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/* Get close-on-exec flag (FD_CLOEXEC in POSIX Table 6-2). */
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return( FD_ISSET(m_in.fd, &fp->fp_cloexec_set) ? FD_CLOEXEC : 0);
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case F_SETFD:
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/* Set close-on-exec flag (FD_CLOEXEC in POSIX Table 6-2). */
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if(m_in.addr & FD_CLOEXEC)
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FD_SET(m_in.fd, &fp->fp_cloexec_set);
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else
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FD_CLR(m_in.fd, &fp->fp_cloexec_set);
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return(OK);
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case F_GETFL:
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/* Get file status flags (O_NONBLOCK and O_APPEND). */
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fl = f->filp_flags & (O_NONBLOCK | O_APPEND | O_ACCMODE);
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return(fl);
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case F_SETFL:
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/* Set file status flags (O_NONBLOCK and O_APPEND). */
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fl = O_NONBLOCK | O_APPEND | O_REOPEN;
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f->filp_flags = (f->filp_flags & ~fl) | (m_in.addr & fl);
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return(OK);
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case F_GETLK:
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case F_SETLK:
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case F_SETLKW:
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/* Set or clear a file lock. */
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r = lock_op(f, m_in.request);
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return(r);
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case F_FREESP:
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{
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/* Free a section of a file. Preparation is done here,
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* actual freeing in freesp_inode().
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*/
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off_t start, end;
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struct flock flock_arg;
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signed long offset;
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/* Check if it's a regular file. */
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if((f->filp_vno->v_mode & I_TYPE) != I_REGULAR) {
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return EINVAL;
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}
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if ( (r = forbidden(f->filp_vno, W_BIT, 0 /*!use_realuid*/)) != OK)
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return r;
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/* Copy flock data from userspace. */
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if((r = sys_datacopy(who_e, (vir_bytes) m_in.name1,
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SELF, (vir_bytes) &flock_arg,
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(phys_bytes) sizeof(flock_arg))) != OK)
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return r;
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/* Convert starting offset to signed. */
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offset = (signed long) flock_arg.l_start;
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/* Figure out starting position base. */
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switch(flock_arg.l_whence) {
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case SEEK_SET: start = 0; if(offset < 0) return EINVAL; break;
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case SEEK_CUR:
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if (ex64hi(f->filp_pos) != 0)
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{
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panic(__FILE__,
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"do_fcntl: position in file too high",
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NO_NUM);
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}
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start = ex64lo(f->filp_pos); break;
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case SEEK_END: start = f->filp_vno->v_size; break;
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default: return EINVAL;
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}
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/* Check for overflow or underflow. */
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if(offset > 0 && start + offset < start) { return EINVAL; }
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if(offset < 0 && start + offset > start) { return EINVAL; }
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start += offset;
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if(flock_arg.l_len > 0) {
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end = start + flock_arg.l_len;
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if(end <= start) {
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return EINVAL;
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}
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}
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else {
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end = 0;
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}
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/* Issue request */
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return req_ftrunc(f->filp_vno->v_fs_e, f->filp_vno->v_inode_nr,
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start, end);
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}
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default:
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return(EINVAL);
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}
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}
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/*===========================================================================*
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* do_sync *
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*===========================================================================*/
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PUBLIC int do_sync()
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{
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struct vmnt *vmp;
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for (vmp = &vmnt[1]; vmp < &vmnt[NR_MNTS]; ++vmp) {
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if (vmp->m_dev != NO_DEV) {
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/* Send sync request */
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req_sync(vmp->m_fs_e);
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}
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}
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return OK;
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}
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/*===========================================================================*
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* do_fsync *
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*===========================================================================*/
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PUBLIC int do_fsync()
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{
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/* Perform the fsync() system call. For now, don't be unnecessarily smart. */
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do_sync();
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return(OK);
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}
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void unmount_all(void)
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{
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int i;
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int found = 0, worked = 0, remain = 0;
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/* Unmount all filesystems. File systems are mounted on other file systems,
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* so you have to pull off the loose bits repeatedly to get it all undone.
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*/
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for (i= 0; i < NR_MNTS; i++) {
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struct vmnt *vmp;
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/* Unmount at least one. */
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worked = remain = 0;
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for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; vmp++) {
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if (vmp->m_dev != NO_DEV) {
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found++;
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SANITYCHECK;
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if(unmount(vmp->m_dev) == OK)
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worked++;
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else
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remain++;
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SANITYCHECK;
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}
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}
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}
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printf("VFS: worked: %d remain: %d\n", worked, remain);
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}
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/*===========================================================================*
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* pm_reboot *
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*===========================================================================*/
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PUBLIC void pm_reboot()
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{
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/* Perform the FS side of the reboot call. */
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int i;
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do_sync();
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SANITYCHECK;
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/* Do exit processing for all leftover processes and servers,
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* but don't actually exit them (if they were really gone, PM
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* will tell us about it).
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*/
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for (i = 0; i < NR_PROCS; i++)
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if((m_in.endpt1 = fproc[i].fp_endpoint) != NONE) {
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/* No FP_EXITING, just free the resources, otherwise
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* consistency check for fp_endpoint (set to NONE) will
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* fail if process wants to do something in the (short)
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* future.
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*/
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free_proc(&fproc[i], 0);
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}
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SANITYCHECK;
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unmount_all();
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SANITYCHECK;
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}
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/*===========================================================================*
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* pm_fork *
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*===========================================================================*/
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PUBLIC void pm_fork(pproc, cproc, cpid)
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int pproc; /* Parent process */
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int cproc; /* Child process */
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int cpid; /* Child process id */
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{
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/* Perform those aspects of the fork() system call that relate to files.
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* In particular, let the child inherit its parent's file descriptors.
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* The parent and child parameters tell who forked off whom. The file
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* system uses the same slot numbers as the kernel. Only MM makes this call.
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*/
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register struct fproc *cp;
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int i, parentno, childno;
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/* Check up-to-dateness of fproc. */
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okendpt(pproc, &parentno);
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/* PM gives child endpoint, which implies process slot information.
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* Don't call isokendpt, because that will verify if the endpoint
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* number is correct in fproc, which it won't be.
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*/
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childno = _ENDPOINT_P(cproc);
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if(childno < 0 || childno >= NR_PROCS)
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panic(__FILE__, "FS: bogus child for forking", m_in.child_endpt);
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if(fproc[childno].fp_pid != PID_FREE)
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panic(__FILE__, "FS: forking on top of in-use child", childno);
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/* Copy the parent's fproc struct to the child. */
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fproc[childno] = fproc[parentno];
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/* Increase the counters in the 'filp' table. */
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cp = &fproc[childno];
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fp = &fproc[parentno];
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for (i = 0; i < OPEN_MAX; i++)
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if (cp->fp_filp[i] != NIL_FILP) cp->fp_filp[i]->filp_count++;
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/* Fill in new process and endpoint id. */
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cp->fp_pid = cpid;
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cp->fp_endpoint = cproc;
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/* A forking process never has an outstanding grant,
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* as it isn't blocking on i/o.
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*/
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if(GRANT_VALID(fp->fp_grant)) {
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printf("vfs: fork: fp (endpoint %d) has grant %d\n", fp->fp_endpoint, fp->fp_grant);
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panic(__FILE__, "fp contains valid grant", NO_NUM);
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}
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if(GRANT_VALID(cp->fp_grant)) {
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printf("vfs: fork: cp (endpoint %d) has grant %d\n", cp->fp_endpoint, cp->fp_grant);
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panic(__FILE__, "cp contains valid grant", NO_NUM);
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}
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/* A child is not a process leader. */
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cp->fp_sesldr = 0;
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/* This child has not exec()ced yet. */
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cp->fp_execced = 0;
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/* Record the fact that both root and working dir have another user. */
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if(cp->fp_rd) dup_vnode(cp->fp_rd);
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if(cp->fp_wd) dup_vnode(cp->fp_wd);
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}
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/*===========================================================================*
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* free_proc *
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*===========================================================================*/
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PRIVATE void free_proc(struct fproc *exiter, int flags)
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{
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int i, task;
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register struct fproc *rfp;
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register struct filp *rfilp;
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register struct vnode *vp;
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dev_t dev;
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SANITYCHECK;
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fp = exiter; /* get_filp() needs 'fp' */
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if(fp->fp_endpoint == NONE) {
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panic(__FILE__, "free_proc: already free", NO_NUM);
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}
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if (fp->fp_suspended == SUSPENDED) {
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SANITYCHECK;
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task = -fp->fp_task;
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unpause(fp->fp_endpoint);
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SANITYCHECK;
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}
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SANITYCHECK;
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/* Loop on file descriptors, closing any that are open. */
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for (i = 0; i < OPEN_MAX; i++) {
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(void) close_fd(fp, i);
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}
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/* Check if any process is SUSPENDed on this driver.
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* If a driver exits, unmap its entries in the dmap table.
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* (unmapping has to be done after the first step, because the
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* dmap table is used in the first step.)
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*/
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unsuspend_by_endpt(fp->fp_endpoint);
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/* Release root and working directories. */
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if(fp->fp_rd) { put_vnode(fp->fp_rd); fp->fp_rd = NIL_VNODE; }
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if(fp->fp_wd) { put_vnode(fp->fp_wd); fp->fp_wd = NIL_VNODE; }
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/* The rest of these actions is only done when processes actually
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* exit.
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*/
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if(!(flags & FP_EXITING)) {
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SANITYCHECK;
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return;
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}
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/* Invalidate endpoint number for error and sanity checks. */
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fp->fp_endpoint = NONE;
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/* If a session leader exits and it has a controlling tty, then revoke
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* access to its controlling tty from all other processes using it.
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*/
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if (fp->fp_sesldr && fp->fp_tty != 0) {
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dev = fp->fp_tty;
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for (rfp = &fproc[0]; rfp < &fproc[NR_PROCS]; rfp++) {
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if(rfp->fp_pid == PID_FREE) continue;
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if (rfp->fp_tty == dev) rfp->fp_tty = 0;
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for (i = 0; i < OPEN_MAX; i++) {
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if ((rfilp = rfp->fp_filp[i]) == NIL_FILP) continue;
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if (rfilp->filp_mode == FILP_CLOSED) continue;
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vp = rfilp->filp_vno;
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if ((vp->v_mode & I_TYPE) != I_CHAR_SPECIAL) continue;
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if ((dev_t) vp->v_sdev != dev) continue;
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(void) dev_close(dev, rfilp-filp);
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/* Ignore any errors, even SUSPEND. */
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rfilp->filp_mode = FILP_CLOSED;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Exit done. Mark slot as free. */
|
|
fp->fp_pid = PID_FREE;
|
|
|
|
SANITYCHECK;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* pm_exit *
|
|
*===========================================================================*/
|
|
PUBLIC void pm_exit(proc)
|
|
int proc;
|
|
{
|
|
int exitee_p;
|
|
/* Perform the file system portion of the exit(status) system call. */
|
|
|
|
/* Nevertheless, pretend that the call came from the user. */
|
|
okendpt(proc, &exitee_p);
|
|
free_proc(&fproc[exitee_p], FP_EXITING);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* pm_setgid *
|
|
*===========================================================================*/
|
|
PUBLIC void pm_setgid(proc_e, egid, rgid)
|
|
int proc_e;
|
|
int egid;
|
|
int rgid;
|
|
{
|
|
register struct fproc *tfp;
|
|
int slot;
|
|
|
|
okendpt(proc_e, &slot);
|
|
tfp = &fproc[slot];
|
|
|
|
tfp->fp_effgid = egid;
|
|
tfp->fp_realgid = rgid;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* pm_setuid *
|
|
*===========================================================================*/
|
|
PUBLIC void pm_setuid(proc_e, euid, ruid)
|
|
int proc_e;
|
|
int euid;
|
|
int ruid;
|
|
{
|
|
register struct fproc *tfp;
|
|
int slot;
|
|
|
|
okendpt(proc_e, &slot);
|
|
tfp = &fproc[slot];
|
|
|
|
tfp->fp_effuid = euid;
|
|
tfp->fp_realuid = ruid;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_svrctl *
|
|
*===========================================================================*/
|
|
PUBLIC int do_svrctl()
|
|
{
|
|
switch (m_in.svrctl_req) {
|
|
case FSSIGNON: {
|
|
/* A server in user space calls in to manage a device. */
|
|
struct fssignon device;
|
|
int r, major, proc_nr_n;
|
|
|
|
if (fp->fp_effuid != SU_UID && fp->fp_effuid != SERVERS_UID)
|
|
return(EPERM);
|
|
|
|
/* Try to copy request structure to FS. */
|
|
if ((r = sys_datacopy(who_e, (vir_bytes) m_in.svrctl_argp,
|
|
FS_PROC_NR, (vir_bytes) &device,
|
|
(phys_bytes) sizeof(device))) != OK)
|
|
return(r);
|
|
|
|
if (isokendpt(who_e, &proc_nr_n) != OK)
|
|
return(EINVAL);
|
|
|
|
/* Try to update device mapping. */
|
|
major = (device.dev >> MAJOR) & BYTE;
|
|
r=map_driver(major, who_e, device.style, 0 /* !force */);
|
|
if (r == OK)
|
|
{
|
|
/* If a driver has completed its exec(), it can be announced
|
|
* to be up.
|
|
*/
|
|
if(fproc[proc_nr_n].fp_execced) {
|
|
/* Reply before calling dev_up */
|
|
#if 0
|
|
printf("do_svrctl: replying before dev_up\n");
|
|
#endif
|
|
reply(who_e, r);
|
|
dev_up(major);
|
|
r= SUSPEND;
|
|
} else {
|
|
dmap[major].dmap_flags |= DMAP_BABY;
|
|
}
|
|
}
|
|
|
|
return(r);
|
|
}
|
|
case FSDEVUNMAP: {
|
|
struct fsdevunmap fdu;
|
|
int r, major;
|
|
/* Try to copy request structure to FS. */
|
|
if ((r = sys_datacopy(who_e, (vir_bytes) m_in.svrctl_argp,
|
|
FS_PROC_NR, (vir_bytes) &fdu,
|
|
(phys_bytes) sizeof(fdu))) != OK)
|
|
return(r);
|
|
major = (fdu.dev >> MAJOR) & BYTE;
|
|
r=map_driver(major, NONE, 0, 0);
|
|
return(r);
|
|
}
|
|
default:
|
|
return(EINVAL);
|
|
}
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* pm_dumpcore *
|
|
*===========================================================================*/
|
|
PUBLIC int pm_dumpcore(proc_e, seg_ptr)
|
|
int proc_e;
|
|
struct mem_map *seg_ptr;
|
|
{
|
|
int r, proc_s;
|
|
|
|
/* Terminate the process */
|
|
okendpt(proc_e, &proc_s);
|
|
free_proc(&fproc[proc_s], FP_EXITING);
|
|
|
|
return OK;
|
|
}
|
|
|
|
|
|
|
|
|