13ef7f1f38
file descriptor passing, PFS does some back calls to VFS. For example, to verify the validity of a path provided by a process and to tell VFS it must copy file descriptors from one process to another.
160 lines
4.6 KiB
C
160 lines
4.6 KiB
C
/* This file contains a few general purpose utility routines.
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*
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* The entry points into this file are
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* clock_time: ask the clock task for the real time
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* copy: copy a block of data
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* fetch_name: go get a path name from user space
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* no_sys: reject a system call that FS does not handle
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* panic: something awful has occurred; MINIX cannot continue
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* conv2: do byte swapping on a 16-bit int
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* conv4: do byte swapping on a 32-bit long
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* in_group: determines if group 'grp' is in rfp->fp_sgroups[]
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*/
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#include "fs.h"
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#include <minix/com.h>
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#include <minix/endpoint.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <assert.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 "vmnt.h"
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/*===========================================================================*
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* fetch_name *
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*===========================================================================*/
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PUBLIC int fetch_name(path, len, flag)
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char *path; /* pointer to the path in user space */
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int len; /* path length, including 0 byte */
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int flag; /* M3 means path may be in message */
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{
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/* Go get path and put it in 'user_fullpath'.
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* If 'flag' = M3 and 'len' <= M3_STRING, the path is present in 'message'.
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* If it is not, go copy it from user space.
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*/
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register char *rpu, *rpm;
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int r, count;
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if (len > PATH_MAX) {
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err_code = ENAMETOOLONG;
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return(EGENERIC);
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}
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if(len >= sizeof(user_fullpath))
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panic("fetch_name: len too much for user_fullpath: %d", len);
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/* Check name length for validity. */
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if (len <= 0) {
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err_code = EINVAL;
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return(EGENERIC);
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}
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if (flag == M3 && len <= M3_STRING) {
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/* Just copy the path from the message to 'user_fullpath'. */
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rpu = &user_fullpath[0];
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rpm = m_in.pathname; /* contained in input message */
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count = len;
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do { *rpu++ = *rpm++; } while (--count);
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r = OK;
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} else {
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/* String is not contained in the message. Get it from user space. */
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r = sys_datacopy(who_e, (vir_bytes) path,
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VFS_PROC_NR, (vir_bytes) user_fullpath, (phys_bytes) len);
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}
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if (user_fullpath[len - 1] != '\0') {
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err_code = ENAMETOOLONG;
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return(EGENERIC);
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}
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return(r);
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}
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/*===========================================================================*
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* no_sys *
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*===========================================================================*/
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PUBLIC int no_sys()
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{
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/* Somebody has used an illegal system call number */
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printf("VFS no_sys: call %d from %d (pid %d)\n", call_nr, who_e, who_p);
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return(ENOSYS);
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}
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/*===========================================================================*
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* isokendpt_f *
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*===========================================================================*/
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PUBLIC int isokendpt_f(char *file, int line, endpoint_t endpoint, int *proc, int fatal)
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{
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int failed = 0;
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endpoint_t ke;
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*proc = _ENDPOINT_P(endpoint);
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if(endpoint == NONE) {
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printf("vfs:%s:%d: endpoint is NONE\n", file, line);
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failed = 1;
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} else if(*proc < 0 || *proc >= NR_PROCS) {
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printf("vfs:%s:%d: proc (%d) from endpoint (%d) out of range\n",
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file, line, *proc, endpoint);
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failed = 1;
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} else if((ke=fproc[*proc].fp_endpoint) != endpoint) {
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if(ke == NONE) {
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printf("vfs:%s:%d: endpoint (%d) points to NONE slot (%d)\n",
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file, line, endpoint, *proc);
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assert(fproc[*proc].fp_pid == PID_FREE);
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} else {
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printf("vfs:%s:%d: proc (%d) from endpoint (%d) doesn't match "
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"known endpoint (%d)\n", file, line, *proc, endpoint,
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fproc[*proc].fp_endpoint);
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assert(fproc[*proc].fp_pid != PID_FREE);
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}
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failed = 1;
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}
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if(failed && fatal)
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panic("isokendpt_f failed");
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return(failed ? EDEADEPT : OK);
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}
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/*===========================================================================*
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* clock_time *
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*===========================================================================*/
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PUBLIC time_t clock_time()
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{
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/* This routine returns the time in seconds since 1.1.1970. MINIX is an
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* astrophysically naive system that assumes the earth rotates at a constant
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* rate and that such things as leap seconds do not exist.
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*/
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register int r;
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clock_t uptime;
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time_t boottime;
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r = getuptime2(&uptime, &boottime);
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if (r != OK)
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panic("clock_time err: %d", r);
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return( (time_t) (boottime + (uptime/system_hz)));
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}
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/*===========================================================================*
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* in_group *
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*===========================================================================*/
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PUBLIC int in_group(struct fproc *rfp, gid_t grp)
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{
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int i;
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for (i = 0; i < rfp->fp_ngroups; i++) {
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if (rfp->fp_sgroups[i] == grp) {
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return(OK);
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}
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}
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return(EINVAL);
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}
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