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Cache last uid, gid to make translation faster.

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This commit is contained in:
rsc 2004-04-08 19:31:21 +00:00
parent 62c1415826
commit 6f6553dfb7
1 changed files with 21 additions and 4 deletions
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21
src/lib9/_p9dir.c
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@ -47,13 +47,20 @@ isdisk(struct stat *st)
#define _HAVESTGEN #define _HAVESTGEN
#endif #endif
/*
* Caching the last group and passwd looked up is
* a significant win (stupidly enough) on most systems.
* It's not safe for threaded programs, but neither is using
* getpwnam in the first place, so I'm not too worried.
*/
int int
_p9dir(struct stat *st, char *name, Dir *d, char **str, char *estr) _p9dir(struct stat *st, char *name, Dir *d, char **str, char *estr)
{ {
char *s; char *s;
char tmp[20]; char tmp[20];
struct group *g; static struct group *g;
struct passwd *p; static struct passwd *p;
static int gid, uid;
int sz; int sz;
sz = 0; sz = 0;
@ -82,7 +89,12 @@ _p9dir(struct stat *st, char *name, Dir *d, char **str, char *estr)
sz += strlen(s)+1; sz += strlen(s)+1;
/* user */ /* user */
if(p && st->st_uid == uid && p->pw_uid == uid)
;
else{
p = getpwuid(st->st_uid); p = getpwuid(st->st_uid);
uid = st->st_uid;
}
if(p == nil){ if(p == nil){
snprint(tmp, sizeof tmp, "%d", (int)st->st_uid); snprint(tmp, sizeof tmp, "%d", (int)st->st_uid);
s = tmp; s = tmp;
@ -100,7 +112,12 @@ _p9dir(struct stat *st, char *name, Dir *d, char **str, char *estr)
} }
/* group */ /* group */
if(g && st->st_gid == gid && g->gr_gid == gid)
;
else{
g = getgrgid(st->st_gid); g = getgrgid(st->st_gid);
gid = st->st_gid;
}
if(g == nil){ if(g == nil){
snprint(tmp, sizeof tmp, "%d", (int)st->st_gid); snprint(tmp, sizeof tmp, "%d", (int)st->st_gid);
s = tmp; s = tmp;