181 lines
4.8 KiB
C
181 lines
4.8 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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* copy_name *
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*===========================================================================*/
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inline int copy_name( size_t len, char *dest)
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{
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/* Go get path and put it in 'dest'.
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*/
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register char *rpu, *rpm;
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if (len > PATH_MAX) { /* 'len' includes terminating-nul */
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err_code = ENAMETOOLONG;
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return(EGENERIC);
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}
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/* Check name length for validity. */
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if (len > SSIZE_MAX) {
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err_code = EINVAL;
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return(EGENERIC);
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}
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if (len <= M3_STRING) {
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/* Just copy the path from the message */
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unsigned int count = 0;
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rpu = &dest[0];
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rpm = job_m_in.pathname; /* contained in input message */
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for (count = 0; count <= len; count++)
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*rpu++ = *rpm++;
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} else {
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/* String is not contained in the message. */
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err_code = EINVAL;
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return(EGENERIC);
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}
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if (dest[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(OK);
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}
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/*===========================================================================*
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* fetch_name *
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*===========================================================================*/
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int fetch_name(vir_bytes path, size_t len, char *dest)
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{
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/* Go get path and put it in 'dest'. */
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int r;
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if (len > PATH_MAX) { /* 'len' includes terminating-nul */
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err_code = ENAMETOOLONG;
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return(EGENERIC);
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}
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/* Check name length for validity. */
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if (len > SSIZE_MAX) {
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err_code = EINVAL;
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return(EGENERIC);
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}
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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, path, VFS_PROC_NR, (vir_bytes) dest, len);
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if (r != OK) {
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err_code = EINVAL;
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return(r);
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}
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if (dest[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(OK);
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}
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/*===========================================================================*
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* no_sys *
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*===========================================================================*/
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int no_sys()
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{
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/* Somebody has used an illegal system call number */
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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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int isokendpt_f(char *file, int line, endpoint_t endpoint, int *proc,
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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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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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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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return(EINVAL);
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}
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