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Implemented negative caching on uid/gid lookup failures. This won't

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matter much on some systems, but on ftp servers (like wcarchive) where
you run with special stripped group and pwd.db files in the anonymous
ftp /etc, this can be a major speedup for ls(1).
This commit is contained in:
David Greenman 1996-03-05 13:11:42 +00:00
parent 26cc34f157
commit 1821ce26bf
1 changed files with 20 additions and 14 deletions
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34
lib/libc/gen/pwcache.c
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@ -53,10 +53,10 @@ user_from_uid(uid, nouser)
{
static struct ncache {
uid_t uid;
int found;
char name[UT_NAMESIZE + 1];
} c_uid[NCACHE];
static int pwopen;
static char nbuf[15]; /* 32 bits == 10 digits */
register struct passwd *pw;
register struct ncache *cp;
@ -66,15 +66,18 @@ user_from_uid(uid, nouser)
setpassent(1);
pwopen = 1;
}
if ((pw = getpwuid(uid)) == NULL) {
pw = getpwuid(uid);
cp->uid = uid;
if (pw != NULL) {
cp->found = 1;
(void)strncpy(cp->name, pw->pw_name, UT_NAMESIZE);
cp->name[UT_NAMESIZE] = '\0';
} else {
cp->found = 0;
(void)snprintf(cp->name, UT_NAMESIZE, "%u", uid);
if (nouser)
return (NULL);
(void)snprintf(nbuf, sizeof(nbuf), "%u", uid);
return (nbuf);
}
cp->uid = uid;
(void)strncpy(cp->name, pw->pw_name, UT_NAMESIZE);
cp->name[UT_NAMESIZE] = '\0';
}
return (cp->name);
}
@ -86,10 +89,10 @@ group_from_gid(gid, nogroup)
{
static struct ncache {
gid_t gid;
int found;
char name[UT_NAMESIZE + 1];
} c_gid[NCACHE];
static int gropen;
static char nbuf[15]; /* 32 bits == 10 digits */
struct group *gr;
struct ncache *cp;
@ -99,15 +102,18 @@ group_from_gid(gid, nogroup)
setgroupent(1);
gropen = 1;
}
if ((gr = getgrgid(gid)) == NULL) {
gr = getgrgid(gid);
cp->gid = gid;
if (gr != NULL) {
cp->found = 1;
(void)strncpy(cp->name, gr->gr_name, UT_NAMESIZE);
cp->name[UT_NAMESIZE] = '\0';
} else {
cp->found = 0;
(void)snprintf(cp->name, UT_NAMESIZE, "%u", gid);
if (nogroup)
return (NULL);
(void)snprintf(nbuf, sizeof(nbuf), "%u", gid);
return (nbuf);
}
cp->gid = gid;
(void)strncpy(cp->name, gr->gr_name, UT_NAMESIZE);
cp->name[UT_NAMESIZE] = '\0';
}
return (cp->name);
}