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Port users(1) to libulog.

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Instead of digging through the utmp database by hand, use proper API
calls to do so.  Instead of parsing entries with a non-empty ut_user, we
now look at LOGIN_PROCESS entries.
This commit is contained in:
Ed Schouten 2009-12-03 16:42:18 +00:00
parent fab0a3c997
commit 42b525af6e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=200066
2 changed files with 27 additions and 22 deletions
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3
usr.bin/users/Makefile
View File

@ -3,4 +3,7 @@
PROG= users
DPADD= ${LIBULOG}
LDADD= -lulog
.include <bsd.prog.mk>

46
usr.bin/users/users.c
View File

@ -45,15 +45,16 @@ static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.h>
#include <sys/types.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ulog.h>
#include <unistd.h>
#include <utmp.h>
typedef char namebuf[UT_NAMESIZE];
typedef char namebuf[MAXLOGNAME];
int scmp(const void *, const void *);
static void usage(void);
@ -65,7 +66,7 @@ main(int argc, char **argv)
int ncnt = 0;
int nmax = 0;
int cnt;
struct utmp utmp;
struct ulog_utmpx *ut;
int ch;
while ((ch = getopt(argc, argv, "")) != -1)
@ -77,28 +78,28 @@ main(int argc, char **argv)
argc -= optind;
argv += optind;
if (!freopen(_PATH_UTMP, "r", stdin))
errx(1, "can't open %s", _PATH_UTMP);
while (fread((char *)&utmp, sizeof(utmp), 1, stdin) == 1) {
if (*utmp.ut_name) {
if (ncnt >= nmax) {
nmax += 32;
names = realloc(names, sizeof (*names) * nmax);
if (!names) {
errx(1, "realloc");
/* NOTREACHED */
}
ulog_setutxent();
while ((ut = ulog_getutxent()) != NULL) {
if (ut->ut_type != LOGIN_PROCESS)
continue;
if (ncnt >= nmax) {
nmax += 32;
names = realloc(names, sizeof(*names) * nmax);
if (!names) {
errx(1, "realloc");
/* NOTREACHED */
}
(void)strncpy(names[ncnt], utmp.ut_name, UT_NAMESIZE);
++ncnt;
}
(void)strlcpy(names[ncnt], ut->ut_user, sizeof(*names));
++ncnt;
}
if (ncnt) {
qsort(names, ncnt, UT_NAMESIZE, scmp);
(void)printf("%.*s", UT_NAMESIZE, names[0]);
ulog_endutxent();
if (ncnt > 0) {
qsort(names, ncnt, sizeof(namebuf), scmp);
(void)printf("%s", names[0]);
for (cnt = 1; cnt < ncnt; ++cnt)
if (strncmp(names[cnt], names[cnt - 1], UT_NAMESIZE))
(void)printf(" %.*s", UT_NAMESIZE, names[cnt]);
if (strcmp(names[cnt], names[cnt - 1]) != 0)
(void)printf(" %s", names[cnt]);
(void)printf("\n");
}
exit(0);
@ -114,5 +115,6 @@ usage(void)
int
scmp(const void *p, const void *q)
{
return(strncmp(p, q, UT_NAMESIZE));
return (strcmp(p, q));
}