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sd-login: if NULL or 0 is passed as first parameter of the sd_xxx functions, work on objects of the calling process

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This commit is contained in:
Lennart Poettering
2012-02-11 03:45:23 +01:00
parent 3d88c0a7d1
commit 50b1678aab
5 changed files with 93 additions and 39 deletions
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4
man/sd_pid_get_session.xml
View File

@@ -113,6 +113,10 @@
fail. For processes not being part of a login session
and not being a shared process of a user this function
will fail.</para>
<para>If the <literal>pid</literal> paramater of any
of these functions is passed as 0 the operation is
executed for the calling process.</para>
</refsect1>
<refsect1>

7
man/sd_seat_get_active.xml
View File

@@ -70,7 +70,7 @@
<funcprototype>
<funcdef>int <function>sd_seat_can_multi_session</function></funcdef>
<paramdef>const char* <parameter>session</parameter></paramdef>
<paramdef>const char* <parameter>seat</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
@@ -110,6 +110,11 @@
capable of multi-session, i.e. allows multiple login
sessions in parallel (whith only one being active at a
time).</para>
<para>If the <literal>seat</literal> parameter of any
of these functions is passed as NULL the operation is
executed for the seat of the session of the calling
process, if there is any.</para>
</refsect1>
<refsect1>

5
man/sd_session_is_active.xml
View File

@@ -110,6 +110,11 @@
the libc
<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
call after use.</para>
<para>If the <literal>session</literal> parameter of
any of these functions is passed as NULL the operation
is executed for the session the calling process is a
member of, if there is any.</para>
</refsect1>
<refsect1>

111
src/login/sd-login.c
View File

@@ -354,16 +354,39 @@ _public_ int sd_uid_get_seats(uid_t uid, int require_active, char ***seats) {
return uid_get_array(uid, require_active ? "ACTIVE_SEATS" : "SEATS", seats);
}
static int file_of_session(const char *session, char **_p) {
char *p;
int r;
assert(_p);
if (session)
p = strappend("/run/systemd/sessions/", session);
else {
char *buf;
r = sd_pid_get_session(0, &buf);
if (r < 0)
return r;
p = strappend("/run/systemd/sessions/", buf);
free(buf);
}
if (!p)
return -ENOMEM;
*_p = p;
return 0;
}
_public_ int sd_session_is_active(const char *session) {
int r;
char *p, *s = NULL;
if (!session)
return -EINVAL;
p = strappend("/run/systemd/sessions/", session);
if (!p)
return -ENOMEM;
r = file_of_session(session, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE, "ACTIVE", &s, NULL);
free(p);
@@ -386,14 +409,12 @@ _public_ int sd_session_get_uid(const char *session, uid_t *uid) {
int r;
char *p, *s = NULL;
if (!session)
return -EINVAL;
if (!uid)
return -EINVAL;
p = strappend("/run/systemd/sessions/", session);
if (!p)
return -ENOMEM;
r = file_of_session(session, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE, "UID", &s, NULL);
free(p);
@@ -416,14 +437,12 @@ _public_ int sd_session_get_seat(const char *session, char **seat) {
char *p, *s = NULL;
int r;
if (!session)
return -EINVAL;
if (!seat)
return -EINVAL;
p = strappend("/run/systemd/sessions/", session);
if (!p)
return -ENOMEM;
r = file_of_session(session, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE, "SEAT", &s, NULL);
free(p);
@@ -444,14 +463,12 @@ _public_ int sd_session_get_service(const char *session, char **service) {
char *p, *s = NULL;
int r;
if (!session)
return -EINVAL;
if (!service)
return -EINVAL;
p = strappend("/run/systemd/sessions/", session);
if (!p)
return -ENOMEM;
r = file_of_session(session, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE, "SERVICE", &s, NULL);
free(p);
@@ -468,18 +485,42 @@ _public_ int sd_session_get_service(const char *session, char **service) {
return 0;
}
static int file_of_seat(const char *seat, char **_p) {
char *p;
int r;
assert(_p);
if (seat)
p = strappend("/run/systemd/seats/", seat);
else {
char *buf;
r = sd_session_get_seat(NULL, &buf);
if (r < 0)
return r;
p = strappend("/run/systemd/seats/", buf);
free(buf);
}
if (!p)
return -ENOMEM;
*_p = p;
return 0;
}
_public_ int sd_seat_get_active(const char *seat, char **session, uid_t *uid) {
char *p, *s = NULL, *t = NULL;
int r;
if (!seat)
return -EINVAL;
if (!session && !uid)
return -EINVAL;
p = strappend("/run/systemd/seats/", seat);
if (!p)
return -ENOMEM;
r = file_of_seat(seat, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE,
"ACTIVE", &s,
@@ -528,12 +569,9 @@ _public_ int sd_seat_get_sessions(const char *seat, char ***sessions, uid_t **ui
unsigned n = 0;
int r;
if (!seat)
return -EINVAL;
p = strappend("/run/systemd/seats/", seat);
if (!p)
return -ENOMEM;
r = file_of_seat(seat, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE,
"SESSIONS", &s,
@@ -619,12 +657,9 @@ _public_ int sd_seat_can_multi_session(const char *seat) {
char *p, *s = NULL;
int r;
if (!seat)
return -EINVAL;
p = strappend("/run/systemd/seats/", seat);
if (!p)
return -ENOMEM;
r = file_of_seat(seat, &p);
if (r < 0)
return r;
r = parse_env_file(p, NEWLINE,
"CAN_MULTI_SESSION", &s,

5
src/login/test-login.c
View File

@@ -125,6 +125,11 @@ int main(int argc, char* argv[]) {
printf("seats = %s\n", t);
free(t);
r = sd_seat_get_active(NULL, &t, NULL);
assert_se(r >= 0);
printf("active session on current seat = %s\n", t);
free(t);
assert_se(sd_get_seats(NULL) == r);
r = sd_get_sessions(&sessions);