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su: make wait_for_child() usable in arbitrary situation 

For example if called more than once; to keep PTY code simple and
robust.

Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Karel Zak 2017-08-16 14:03:06 +02:00
parent 665f36bed9
commit b55e712816
1 changed files with 13 additions and 11 deletions
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24
login-utils/su-common.c
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@ -334,21 +334,23 @@ static void supam_open_session(struct su_context *su)
static int wait_for_child(struct su_context *su)
{
pid_t pid;
pid_t pid = (pid_t) -1;;
int status = 0;
DBG(SIG, ul_debug("waiting for child [%d]...", su->child));
for (;;) {
pid = waitpid(su->child, &status, WUNTRACED);
if (su->child != (pid_t) -1) {
DBG(SIG, ul_debug("waiting for child [%d]...", su->child));
for (;;) {
pid = waitpid(su->child, &status, WUNTRACED);
if (pid != (pid_t) - 1 && WIFSTOPPED(status)) {
kill(getpid(), SIGSTOP);
/* once we get here, we must have resumed */
kill(pid, SIGCONT);
} else
break;
if (pid != (pid_t) - 1 && WIFSTOPPED(status)) {
kill(getpid(), SIGSTOP);
/* once we get here, we must have resumed */
kill(pid, SIGCONT);
} else
break;
}
}
if (pid != (pid_t) - 1) {
if (pid != (pid_t) -1) {
if (WIFSIGNALED(status)) {
fprintf(stderr, "%s%s\n",
strsignal(WTERMSIG(status)),