mirror of
https://git.suckless.org/9base
synced 2025-08-25 01:13:48 -07:00
75 lines
1.3 KiB
C
75 lines
1.3 KiB
C
#include <u.h>
|
|
#include <libc.h>
|
|
#include <ctype.h>
|
|
|
|
/*
|
|
* Absent other hints, it works reasonably well to use
|
|
* the X11 display name as the name space identifier.
|
|
* This is how sam's B has worked since the early days.
|
|
* Since most programs using name spaces are also using X,
|
|
* this still seems reasonable. Terminal-only sessions
|
|
* can set $NAMESPACE.
|
|
*/
|
|
static char*
|
|
nsfromdisplay(void)
|
|
{
|
|
int fd;
|
|
Dir *d;
|
|
char *disp, *p;
|
|
|
|
if((disp = getenv("DISPLAY")) == nil){
|
|
werrstr("$DISPLAY not set");
|
|
return nil;
|
|
}
|
|
|
|
/* canonicalize: xxx:0.0 => xxx:0 */
|
|
p = strrchr(disp, ':');
|
|
if(p){
|
|
p++;
|
|
while(isdigit((uchar)*p))
|
|
p++;
|
|
if(strcmp(p, ".0") == 0)
|
|
*p = 0;
|
|
}
|
|
|
|
p = smprint("/tmp/ns.%s.%s", getuser(), disp);
|
|
free(disp);
|
|
if(p == nil){
|
|
werrstr("out of memory");
|
|
return p;
|
|
}
|
|
if((fd=create(p, OREAD, DMDIR|0700)) >= 0){
|
|
close(fd);
|
|
return p;
|
|
}
|
|
if((d = dirstat(p)) == nil){
|
|
free(d);
|
|
werrstr("stat %s: %r", p);
|
|
free(p);
|
|
return nil;
|
|
}
|
|
if((d->mode&0777) != 0700 || strcmp(d->uid, getuser()) != 0){
|
|
werrstr("bad name space dir %s", p);
|
|
free(p);
|
|
free(d);
|
|
return nil;
|
|
}
|
|
free(d);
|
|
return p;
|
|
}
|
|
|
|
char*
|
|
getns(void)
|
|
{
|
|
char *ns;
|
|
|
|
ns = getenv("NAMESPACE");
|
|
if(ns == nil)
|
|
ns = nsfromdisplay();
|
|
if(ns == nil){
|
|
werrstr("$NAMESPACE not set, %r");
|
|
return nil;
|
|
}
|
|
return ns;
|
|
}
|