tCache last uid, gid to make translation faster. - plan9port - [fork] Plan 9 from user space
HTML git clone git://src.adamsgaard.dk/plan9port
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DIR Files
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DIR LICENSE
---
DIR commit 6f6553dfb7ab5b286e3ac75348eb85dc8fda6666
DIR parent 62c141582684ff2afdaa7c8698df9f596b2d3c84
HTML Author: rsc <devnull@localhost>
Date: Thu, 8 Apr 2004 19:31:21 +0000
Cache last uid, gid to make translation faster.
Diffstat:
M src/lib9/_p9dir.c | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)
---
DIR diff --git a/src/lib9/_p9dir.c b/src/lib9/_p9dir.c
t@@ -47,13 +47,20 @@ isdisk(struct stat *st)
#define _HAVESTGEN
#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
_p9dir(struct stat *st, char *name, Dir *d, char **str, char *estr)
{
char *s;
char tmp[20];
- struct group *g;
- struct passwd *p;
+ static struct group *g;
+ static struct passwd *p;
+ static int gid, uid;
int sz;
sz = 0;
t@@ -82,7 +89,12 @@ _p9dir(struct stat *st, char *name, Dir *d, char **str, char *estr)
sz += strlen(s)+1;
/* user */
- p = getpwuid(st->st_uid);
+ if(p && st->st_uid == uid && p->pw_uid == uid)
+ ;
+ else{
+ p = getpwuid(st->st_uid);
+ uid = st->st_uid;
+ }
if(p == nil){
snprint(tmp, sizeof tmp, "%d", (int)st->st_uid);
s = tmp;
t@@ -100,7 +112,12 @@ _p9dir(struct stat *st, char *name, Dir *d, char **str, char *estr)
}
/* group */
- g = getgrgid(st->st_gid);
+ if(g && st->st_gid == gid && g->gr_gid == gid)
+ ;
+ else{
+ g = getgrgid(st->st_gid);
+ gid = st->st_gid;
+ }
if(g == nil){
snprint(tmp, sizeof tmp, "%d", (int)st->st_gid);
s = tmp;