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Properly styleify utmpx code and document error codes in man page.

Browse Source 
Submitted by:	Garrett Cooper
This commit is contained in:
Ed Schouten 2011-02-19 11:31:56 +00:00
parent 9f0f6d5fd7
commit 1ae6a21db9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=218846
4 changed files with 107 additions and 56 deletions
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27
lib/libc/gen/getutxent.3
View File

@ -367,16 +367,15 @@ It returns
.Dv NULL
when the provided
.Vt utmpx
is invalid.
This may be because
.Fa ut_type
is invalid or
is invalid, or
.Fa ut_type
has a value of
.Dv DEAD_PROCESS
and an entry with an identifier with a value equal to the field
.Fa ut_id
was not found.
was not found; the global variable
.Va errno
is set to indicate the error.
.Pp
The
.Fn setutxdb
@ -387,6 +386,24 @@ Otherwise, -1 is returned and the global variable
is set to indicate the error.
.Sh ERRORS
In addition to the error conditions described in
.Xr fdopen 3 ,
.Xr fopen 3 ,
.Xr fseek 3 ,
.Xr open 3 ,
the
.Fn pututxline
function can generate the following errors:
.Bl -tag -width Er
.It Bq Er ESRCH
The value of
.Fa ut_type
is DEAD_PROCESS, and the process entry could not be found.
.It Bq Er EINVAL
The value of
.Fa ut_type
is not supported by this implementation.
.El
In addition to the error conditions described in
.Xr fopen 3 ,
the
.Fn setutxdb

18
lib/libc/gen/getutxent.c
View File

@ -112,22 +112,22 @@ getfutxent(struct futx *fu)
if (udb == UTXDB_LOG) {
uint16_t len;
if (fread(&len, sizeof len, 1, uf) != 1)
if (fread(&len, sizeof(len), 1, uf) != 1)
return (-1);
len = be16toh(len);
if (len > sizeof *fu) {
/* Forward compatibility. */
if (fread(fu, sizeof *fu, 1, uf) != 1)
if (fread(fu, sizeof(*fu), 1, uf) != 1)
return (-1);
fseek(uf, len - sizeof *fu, SEEK_CUR);
fseek(uf, len - sizeof(*fu), SEEK_CUR);
} else {
/* Partial record. */
memset(fu, 0, sizeof *fu);
memset(fu, 0, sizeof(*fu));
if (fread(fu, len, 1, uf) != 1)
return (-1);
}
} else {
if (fread(fu, sizeof *fu, 1, uf) != 1)
if (fread(fu, sizeof(*fu), 1, uf) != 1)
return (-1);
}
return (0);
@ -163,7 +163,8 @@ getutxid(const struct utmpx *id)
case LOGIN_PROCESS:
case DEAD_PROCESS:
if (memcmp(fu.fu_id, id->ut_id,
MIN(sizeof fu.fu_id, sizeof id->ut_id)) == 0)
MIN(sizeof(fu.fu_id), sizeof(id->ut_id))) ==
0)
goto found;
}
break;
@ -191,7 +192,8 @@ getutxline(const struct utmpx *line)
case USER_PROCESS:
case LOGIN_PROCESS:
if (strncmp(fu.fu_line, line->ut_line,
MIN(sizeof fu.fu_line, sizeof line->ut_line)) == 0)
MIN(sizeof(fu.fu_line), sizeof(line->ut_line))) ==
0)
goto found;
break;
}
@ -212,7 +214,7 @@ getutxuser(const char *user)
switch (fu.fu_type) {
case USER_PROCESS:
if (strncmp(fu.fu_user, user, sizeof fu.fu_user) == 0)
if (strncmp(fu.fu_user, user, sizeof(fu.fu_user)) == 0)
goto found;
break;
}

115
lib/libc/gen/pututxline.c
View File

@ -43,9 +43,9 @@ __FBSDID("$FreeBSD$");
static FILE *
futx_open(const char *file)
{
int fd;
FILE *fp;
struct stat sb;
FILE *fp;
int fd;
fd = _open(file, O_CREAT|O_RDWR|O_EXLOCK, 0644);
if (fd < 0)
@ -54,7 +54,7 @@ futx_open(const char *file)
/* Safety check: never use broken files. */
if (_fstat(fd, &sb) != -1 && sb.st_size % sizeof(struct futx) != 0) {
_close(fd);
errno = EINVAL;
errno = EFTYPE;
return (NULL);
}
@ -63,16 +63,16 @@ futx_open(const char *file)
_close(fd);
return (NULL);
}
return (fp);
}
static int
utx_active_add(const struct futx *fu)
{
FILE *fp;
struct futx fe;
FILE *fp;
off_t partial = -1;
int error, ret;
/*
* Register user login sessions. Overwrite entries of sessions
@ -80,16 +80,17 @@ utx_active_add(const struct futx *fu)
*/
fp = futx_open(_PATH_UTX_ACTIVE);
if (fp == NULL)
return (1);
while (fread(&fe, sizeof fe, 1, fp) == 1) {
return (-1);
while (fread(&fe, sizeof(fe), 1, fp) == 1) {
switch (fe.fu_type) {
case USER_PROCESS:
case INIT_PROCESS:
case LOGIN_PROCESS:
case DEAD_PROCESS:
/* Overwrite when ut_id matches. */
if (memcmp(fu->fu_id, fe.fu_id, sizeof fe.fu_id) == 0) {
fseeko(fp, -(off_t)sizeof fe, SEEK_CUR);
if (memcmp(fu->fu_id, fe.fu_id, sizeof(fe.fu_id)) ==
0) {
ret = fseeko(fp, -(off_t)sizeof(fe), SEEK_CUR);
goto exact;
}
if (fe.fu_type != DEAD_PROCESS)
@ -97,55 +98,73 @@ utx_active_add(const struct futx *fu)
/* FALLTHROUGH */
default:
/* Allow us to overwrite unused records. */
if (partial == -1)
partial = ftello(fp) - (off_t)sizeof fe;
if (partial == -1) {
partial = ftello(fp);
/*
* Distinguish errors from valid values so we
* don't overwrite good data by accident.
*/
if (partial != -1)
partial -= (off_t)sizeof(fe);
}
break;
}
}
/*
* No exact match found. Use the partial match. If no partial
* match was found, just append a new record.
*/
if (partial != -1)
fseeko(fp, partial, SEEK_SET);
ret = fseeko(fp, partial, SEEK_SET);
exact:
fwrite(fu, sizeof *fu, 1, fp);
if (ret == -1)
error = errno;
else if (fwrite(fu, sizeof(*fu), 1, fp) < 1)
error = errno;
else
error = 0;
fclose(fp);
return (0);
errno = error;
return (error == 0 ? 0 : 1);
}
static int
utx_active_remove(struct futx *fu)
{
FILE *fp;
struct futx fe;
FILE *fp;
int error, ret;
/*
* Remove user login sessions, having the same ut_id.
*/
fp = futx_open(_PATH_UTX_ACTIVE);
if (fp == NULL)
return (1);
while (fread(&fe, sizeof fe, 1, fp) == 1) {
return (-1);
error = ESRCH;
ret = -1;
while (fread(&fe, sizeof(fe), 1, fp) == 1 && ret != 0)
switch (fe.fu_type) {
case USER_PROCESS:
case INIT_PROCESS:
case LOGIN_PROCESS:
if (memcmp(fu->fu_id, fe.fu_id, sizeof fe.fu_id) != 0)
if (memcmp(fu->fu_id, fe.fu_id, sizeof(fe.fu_id)) != 0)
continue;
/* Terminate session. */
fseeko(fp, -(off_t)sizeof fe, SEEK_CUR);
fwrite(fu, sizeof *fu, 1, fp);
fclose(fp);
return (0);
if (fseeko(fp, -(off_t)sizeof(fe), SEEK_CUR) == -1)
error = errno;
else if (fwrite(fu, sizeof(*fu), 1, fp) < 1)
error = errno;
else
ret = 0;
}
}
fclose(fp);
errno = ESRCH;
return (1);
errno = error;
return (ret);
}
static void
@ -158,8 +177,11 @@ utx_active_purge(void)
static int
utx_lastlogin_add(const struct futx *fu)
{
FILE *fp;
struct futx fe;
FILE *fp;
int error, ret;
ret = 0;
/*
* Write an entry to lastlogin. Overwrite the entry if the
@ -168,25 +190,31 @@ utx_lastlogin_add(const struct futx *fu)
*/
fp = futx_open(_PATH_UTX_LASTLOGIN);
if (fp == NULL)
return (1);
return (-1);
while (fread(&fe, sizeof fe, 1, fp) == 1) {
if (strncmp(fu->fu_user, fe.fu_user, sizeof fe.fu_user) != 0)
continue;
/* Found a previous lastlogin entry for this user. */
fseeko(fp, -(off_t)sizeof fe, SEEK_CUR);
ret = fseeko(fp, -(off_t)sizeof fe, SEEK_CUR);
break;
}
fwrite(fu, sizeof *fu, 1, fp);
if (ret == -1)
error = errno;
else if (fwrite(fu, sizeof *fu, 1, fp) < 1) {
error = errno;
ret = -1;
}
fclose(fp);
return (0);
errno = error;
return (ret);
}
static void
utx_lastlogin_upgrade(void)
{
int fd;
struct stat sb;
int fd;
fd = _open(_PATH_UTX_LASTLOGIN, O_RDWR, 0644);
if (fd < 0)
@ -205,9 +233,9 @@ utx_lastlogin_upgrade(void)
static int
utx_log_add(const struct futx *fu)
{
int fd;
uint16_t l;
struct iovec vec[2];
int error, fd;
uint16_t l;
/*
* Append an entry to the log file. We only need to append
@ -215,19 +243,23 @@ utx_log_add(const struct futx *fu)
* zero-bytes. Prepend a length field, indicating the length of
* the record, excluding the length field itself.
*/
for (l = sizeof *fu; l > 0 && ((const char *)fu)[l - 1] == '\0'; l--);
for (l = sizeof(*fu); l > 0 && ((const char *)fu)[l - 1] == '\0'; l--) ;
vec[0].iov_base = &l;
vec[0].iov_len = sizeof l;
vec[0].iov_len = sizeof(l);
vec[1].iov_base = __DECONST(void *, fu);
vec[1].iov_len = l;
l = htobe16(l);
fd = _open(_PATH_UTX_LOG, O_CREAT|O_WRONLY|O_APPEND, 0644);
if (fd < 0)
return (1);
_writev(fd, vec, 2);
return (-1);
if (_writev(fd, vec, 2) == -1)
error = errno;
else
error = 0;
_close(fd);
return (0);
errno = error;
return (error == 0 ? 0 : 1);
}
struct utmpx *
@ -237,7 +269,7 @@ pututxline(const struct utmpx *utmpx)
int bad = 0;
utx_to_futx(utmpx, &fu);
switch (fu.fu_type) {
case BOOT_TIME:
case SHUTDOWN_TIME:
@ -267,6 +299,7 @@ pututxline(const struct utmpx *utmpx)
return (NULL);
break;
default:
errno = EINVAL;
return (NULL);
}

3
lib/libc/gen/utxdb.c
View File

@ -132,9 +132,8 @@ futx_to_utx(const struct futx *fu)
ut = calloc(1, sizeof *ut);
if (ut == NULL)
return (NULL);
} else {
} else
memset(ut, 0, sizeof *ut);
}
switch (fu->fu_type) {
case BOOT_TIME: