. loops checked for PID_FREE . exit broken down in exit and cleanup functions; when reboot happens, cleanup is done but not exit (as processes have not actually exited), this keeps drivers working . fixed a few uninitialized and unused variables scripts: . new packaging system
590 lines
18 KiB
C
590 lines
18 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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*/
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#include "fs.h"
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#include <fcntl.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/endpoint.h>
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#include <minix/com.h>
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#include <sys/svrctl.h>
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#include "buf.h"
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#include "file.h"
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#include "fproc.h"
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#include "inode.h"
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#include "param.h"
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#include "super.h"
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FORWARD _PROTOTYPE( int free_proc, (struct fproc *freed, int flags));
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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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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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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) return(err_code);
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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( ((fp->fp_cloexec >> m_in.fd) & 01) ? 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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cloexec_mask = 1L << m_in.fd; /* singleton set position ok */
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clo_value = (m_in.addr & FD_CLOEXEC ? cloexec_mask : 0L);
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fp->fp_cloexec = (fp->fp_cloexec & ~cloexec_mask) | clo_value;
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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;
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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_ino->i_mode & I_TYPE) != I_REGULAR) {
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return EINVAL;
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}
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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: start = f->filp_pos; break;
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case SEEK_END: start = f->filp_ino->i_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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r = freesp_inode(f->filp_ino, start, end);
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} else {
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r = truncate_inode(f->filp_ino, start);
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}
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return r;
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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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/* Perform the sync() system call. Flush all the tables.
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* The order in which the various tables are flushed is critical. The
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* blocks must be flushed last, since rw_inode() leaves its results in
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* the block cache.
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*/
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register struct inode *rip;
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register struct buf *bp;
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/* Write all the dirty inodes to the disk. */
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for (rip = &inode[0]; rip < &inode[NR_INODES]; rip++)
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if (rip->i_count > 0 && rip->i_dirt == DIRTY) rw_inode(rip, WRITING);
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/* Write all the dirty blocks to the disk, one drive at a time. */
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for (bp = &buf[0]; bp < &buf[NR_BUFS]; bp++)
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if (bp->b_dev != NO_DEV && bp->b_dirt == DIRTY) flushall(bp->b_dev);
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return(OK); /* sync() can't fail */
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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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/*===========================================================================*
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* do_reboot *
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*===========================================================================*/
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PUBLIC int do_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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struct super_block *sp;
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struct inode dummy;
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/* Only PM may make this call directly. */
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if (who_e != PM_PROC_NR) return(EGENERIC);
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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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free_proc(&fproc[i], 0);
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/* The root file system is mounted onto itself, which keeps it from being
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* unmounted. Pull an inode out of thin air and put the root on it.
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*/
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put_inode(super_block[0].s_imount);
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super_block[0].s_imount= &dummy;
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dummy.i_count = 2; /* expect one "put" */
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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_SUPERS; i++) {
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/* Unmount at least one. */
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for (sp= &super_block[0]; sp < &super_block[NR_SUPERS]; sp++) {
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if (sp->s_dev != NO_DEV) (void) unmount(sp->s_dev);
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}
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}
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/* Sync any unwritten buffers. */
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do_sync();
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return(OK);
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}
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/*===========================================================================*
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* do_fork *
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*===========================================================================*/
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PUBLIC int do_fork()
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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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/* Only PM may make this call directly. */
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if (who_e != PM_PROC_NR) return(EGENERIC);
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/* Check up-to-dateness of fproc. */
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okendpt(m_in.parent_endpt, &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(m_in.child_endpt);
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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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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 = m_in.pid;
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cp->fp_endpoint = m_in.child_endpt;
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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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#if 0
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printf("do_fork: child %d, slot %d\n", m_in.child_endpt, cp-fproc);
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#endif
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/* Record the fact that both root and working dir have another user. */
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dup_inode(cp->fp_rootdir);
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dup_inode(cp->fp_workdir);
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return(OK);
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}
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/*===========================================================================*
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* do_exec *
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*===========================================================================*/
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PUBLIC int do_exec()
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{
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/* Files can be marked with the FD_CLOEXEC bit (in fp->fp_cloexec). When
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* MM does an EXEC, it calls FS to allow FS to find these files and close them.
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*/
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int i, proc;
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long bitmap;
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/* Only PM may make this call directly. */
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if (who_e != PM_PROC_NR) return(EGENERIC);
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/* The array of FD_CLOEXEC bits is in the fp_cloexec bit map. */
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okendpt(m_in.endpt1, &proc);
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fp = &fproc[proc]; /* get_filp() needs 'fp' */
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bitmap = fp->fp_cloexec;
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if (bitmap) {
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/* Check the file desriptors one by one for presence of FD_CLOEXEC. */
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for (i = 0; i < OPEN_MAX; i++) {
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m_in.fd = i;
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if ( (bitmap >> i) & 01) (void) do_close();
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}
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}
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/* This child has now exec()ced. */
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fp->fp_execced = 1;
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/* Reply to caller (PM) directly. */
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reply(who_e, OK);
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/* Check if this is a driver that can now be useful. */
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dmap_endpt_up(fp->fp_endpoint);
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/* Suppress reply to caller (caller already replied to). */
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return SUSPEND;
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}
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/*===========================================================================*
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* free_proc *
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*===========================================================================*/
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PRIVATE int 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 inode *rip;
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dev_t dev;
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fp = exiter; /* get_filp() needs 'fp' */
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if (fp->fp_suspended == SUSPENDED) {
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task = -fp->fp_task;
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if (task == XPIPE || task == XPOPEN) susp_count--;
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m_in.ENDPT = fp->fp_endpoint;
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(void) do_unpause(); /* this always succeeds for MM */
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fp->fp_suspended = NOT_SUSPENDED;
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}
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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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m_in.fd = i;
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(void) do_close();
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}
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/* Release root and working directories. */
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put_inode(fp->fp_rootdir);
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put_inode(fp->fp_workdir);
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fp->fp_rootdir = NIL_INODE;
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fp->fp_workdir = NIL_INODE;
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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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/* 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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return OK;
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dmap_unmap_by_endpt(fp->fp_endpoint);
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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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rip = rfilp->filp_ino;
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if ((rip->i_mode & I_TYPE) != I_CHAR_SPECIAL) continue;
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if ((dev_t) rip->i_zone[0] != dev) continue;
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dev_close(dev);
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rfilp->filp_mode = FILP_CLOSED;
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}
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}
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}
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/* Exit done. Mark slot as free. */
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fp->fp_pid = PID_FREE;
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return(OK);
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}
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/*===========================================================================*
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* do_exit *
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*===========================================================================*/
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PUBLIC int do_exit()
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{
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int exitee_p, exitee_e;
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/* Perform the file system portion of the exit(status) system call. */
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/* Only PM may do the EXIT call directly. */
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if (who_e != PM_PROC_NR) return(EGENERIC);
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/* Nevertheless, pretend that the call came from the user. */
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exitee_e = m_in.endpt1;
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okendpt(exitee_e, &exitee_p);
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return free_proc(&fproc[exitee_p], FP_EXITING);
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}
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|
/*===========================================================================*
|
|
* do_set *
|
|
*===========================================================================*/
|
|
PUBLIC int do_set()
|
|
{
|
|
/* Set uid_t or gid_t field. */
|
|
|
|
register struct fproc *tfp;
|
|
int proc;
|
|
|
|
/* Only PM may make this call directly. */
|
|
if (who_e != PM_PROC_NR) return(EGENERIC);
|
|
|
|
okendpt(m_in.endpt1, &proc);
|
|
tfp = &fproc[proc];
|
|
if (call_nr == SETUID) {
|
|
tfp->fp_realuid = (uid_t) m_in.real_user_id;
|
|
tfp->fp_effuid = (uid_t) m_in.eff_user_id;
|
|
}
|
|
if (call_nr == SETGID) {
|
|
tfp->fp_effgid = (gid_t) m_in.eff_grp_id;
|
|
tfp->fp_realgid = (gid_t) m_in.real_grp_id;
|
|
}
|
|
return(OK);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_revive *
|
|
*===========================================================================*/
|
|
PUBLIC int do_revive()
|
|
{
|
|
/* A driver, typically TTY, has now gotten the characters that were needed for
|
|
* a previous read. The process did not get a reply when it made the call.
|
|
* Instead it was suspended. Now we can send the reply to wake it up. This
|
|
* business has to be done carefully, since the incoming message is from
|
|
* a driver (to which no reply can be sent), and the reply must go to a process
|
|
* that blocked earlier. The reply to the caller is inhibited by returning the
|
|
* 'SUSPEND' pseudo error, and the reply to the blocked process is done
|
|
* explicitly in revive().
|
|
*/
|
|
revive(m_in.REP_ENDPT, m_in.REP_STATUS);
|
|
return(SUSPEND); /* don't reply to the TTY task */
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* 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);
|
|
if (r == OK)
|
|
{
|
|
/* If a driver has completed its exec(), it can be announced
|
|
* to be up.
|
|
*/
|
|
if(fproc[proc_nr_n].fp_execced) {
|
|
dev_up(major);
|
|
} 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);
|
|
return(r);
|
|
}
|
|
default:
|
|
return(EINVAL);
|
|
}
|
|
}
|