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