The run-read bash ptest fails when it's being run by ptest-runner, but
it is successful when run manually:
0 0 0
0
0
-0
+1
timeout 1: ok
unset or null 1
-1
+timeout 2: ok
unset or null 2
timeout 3: ok
unset or null 3
FAIL: run-read

The actual testcase that is failing is:
tests/read6.sub:
read -t 0
echo $?

This failure seems to be related to how the pty setup is handled:
openpty() is called in the child process and the master/slave file
descriptors are left dangling.

To fix this:
- move the openpty() call in the parent process, before fork()-ing
- assign the slave end of the pty as the stdin for the child process
- adjust the TIOCSCTTY ioctl call to use the file descriptor of the pty file

Fixes: 59381a643e1f ("utils: ensure child can be session leader")
Signed-off-by: Ovidiu Panait <ovidiu.panait@...>
---
utils.c | 45 +++++++++++++++++++++++++--------------------
1 file changed, 25 insertions(+), 20 deletions(-)

diff --git a/utils.c b/utils.c
index a67ac11..87ac20e 100644
--- a/utils.c
+++ b/utils.c
@@ -385,18 +385,9 @@ wait_child(pid_t pid)
* fp should be writable, likely stdout/err.
*/
static int
-setup_slave_pty(FILE *fp) {
- int pty_master = -1;
- int pty_slave = -1;
- char pty_name[256];
+setup_slave_pty(FILE *fp, char *pty_name) {
struct group *gptr;
gid_t gid;
- int slave = -1;
-
- if (openpty(&pty_master, &pty_slave, pty_name, NULL, NULL) < 0) {
- fprintf(fp, "ERROR: openpty() failed with: %s.\n", strerror(errno));
- return -1;
- }
if ((gptr = getgrnam(pty_name)) != 0) {
gid = gptr->gr_gid;
@@ -419,10 +410,7 @@ setup_slave_pty(FILE *fp) {
fprintf(fp, "ERROR: chmod() failed with: %s.\n", strerror(errno));
}
- if ((slave = open(pty_name, O_RDWR)) == -1) {
- fprintf(fp, "ERROR: open() failed with: %s.\n", strerror(errno));
- }
- return (slave);
+ return 0;
}
@@ -441,10 +429,14 @@ run_ptests(struct ptest_list *head, const struct ptest_options opts,
int pipefd_stderr[2];
time_t sttime, entime;
time_t duration;
- int slave;
int pgid = -1;
pthread_t tid;
+ int pty_master = -1;
+ int pty_slave = -1;
+ char pty_name[256];
+ int fd = -1;
+
if (opts.xml_filename) {
xh = xml_create(ptest_list_length(head), opts.xml_filename);
if (!xh)
@@ -493,15 +485,22 @@ run_ptests(struct ptest_list *head, const struct ptest_options opts,
fprintf(fp, "ERROR: getpgid() failed, %s\n", strerror(errno));
}
+ if (openpty(&pty_master, &pty_slave, pty_name, NULL, NULL) < 0) {
+ fprintf(fp, "ERROR: openpty() failed with: %s.\n", strerror(errno));
+ return -1;
+ }
+
child = fork();
if (child == -1) {
fprintf(fp, "ERROR: Fork %s\n", strerror(errno));
rc = -1;
break;
} else if (child == 0) {
- close(0);
- if ((slave = setup_slave_pty(fp)) < 0) {
- fprintf(fp, "ERROR: could not setup pty (%d).", slave);
+ close(pty_master);
+ dup2(pty_slave, STDIN_FILENO);
+
+ if ((rc = setup_slave_pty(fp, pty_name)) < 0) {
+ fprintf(fp, "ERROR: could not setup pty (%d).", rc);
}
if (setpgid(0,pgid) == -1) {
fprintf(fp, "ERROR: setpgid() failed, %s\n", strerror(errno));
@@ -511,8 +510,12 @@ run_ptests(struct ptest_list *head, const struct ptest_options opts,
fprintf(fp, "ERROR: setsid() failed, %s\n", strerror(errno));
}
- if (ioctl(0, TIOCSCTTY, NULL) == -1) {
- fprintf(fp, "ERROR: Unable to attach to controlling tty, %s\n", strerror(errno));
+ if ((fd = open(pty_name, O_RDWR)) >= 0) {
+ if (ioctl(fd, TIOCSCTTY, NULL) == -1) {
+ fprintf(fp, "ERROR: Unable to attach to controlling tty, %s\n", strerror(errno));
+ }
+
+ close(fd);
}
run_child(p->run_ptest, pipefd_stdout[1], pipefd_stderr[1]);
@@ -549,6 +552,8 @@ run_ptests(struct ptest_list *head, const struct ptest_options opts,
fprintf(fp, "END: %s\n", ptest_dir);
fprintf(fp, "%s\n", get_stime(stime, GET_STIME_BUF_SIZE, entime));
}
+ close(pty_master);
+ close(pty_slave);
free(ptest_dir);
PTEST_LIST_ITERATE_END
fprintf(fp, "STOP: %s\n", progname);