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coverity/105982: Unckecked return value: RI.

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Problem    : Unchecked return value from library @ 91.
Diagnostic : Real issue.
Rationale  : fcntl can fail, which is not being checked.
Resolution : Add corresponding error handling.

Helped-by: oni-link <knil.ino@gmail.com>
This commit is contained in:
Eliseo Martínez 2015-03-17 18:45:26 +01:00
parent 3db0a40d69
commit a2b4535747
1 changed files with 39 additions and 1 deletions
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40
src/nvim/os/pty_process.c
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@ -40,6 +40,7 @@ typedef struct {
void pty_process_init(Job *job)
{
PtyProcess *ptyproc = xmalloc(sizeof(PtyProcess));
ptyproc->tty_fd = -1;
if (job->opts.writable) {
uv_pipe_init(uv_default_loop(), &ptyproc->proc_stdin, 0);
@ -69,6 +70,9 @@ void pty_process_destroy(Job *job)
job->process = NULL;
}
static const unsigned int KILL_RETRIES = 5;
static const unsigned int KILL_TIMEOUT = 2; // seconds
bool pty_process_spawn(Job *job)
{
int master;
@ -88,7 +92,15 @@ bool pty_process_spawn(Job *job)
}
// make sure the master file descriptor is non blocking
fcntl(master, F_SETFL, fcntl(master, F_GETFL) | O_NONBLOCK);
int master_status_flags = fcntl(master, F_GETFL);
if (master_status_flags == -1) {
ELOG("Failed to get master descriptor status flags: %s", strerror(errno));
goto error;
}
if (fcntl(master, F_SETFL, master_status_flags | O_NONBLOCK) == -1) {
ELOG("Failed to make master descriptor non-blocking: %s", strerror(errno));
goto error;
}
if (job->opts.writable) {
uv_pipe_open(&ptyproc->proc_stdin, dup(master));
@ -108,6 +120,22 @@ bool pty_process_spawn(Job *job)
ptyproc->tty_fd = master;
job->pid = pid;
return true;
error:
close(master);
// terminate spawned process
kill(pid, SIGTERM);
int status, child;
unsigned int try = 0;
while (try++ < KILL_RETRIES && !(child = waitpid(pid, &status, WNOHANG))) {
sleep(KILL_TIMEOUT);
}
if (child != pid) {
kill(pid, SIGKILL);
}
return false;
}
void pty_process_close(Job *job)
@ -115,10 +143,20 @@ void pty_process_close(Job *job)
PtyProcess *ptyproc = job->process;
uv_signal_stop(&ptyproc->schld);
uv_close((uv_handle_t *)&ptyproc->schld, NULL);
pty_process_close_master(job);
job_close_streams(job);
job_decref(job);
}
void pty_process_close_master(Job *job)
{
PtyProcess *ptyproc = job->process;
if (ptyproc->tty_fd >= 0) {
close(ptyproc->tty_fd);
ptyproc->tty_fd = -1;
}
}
void pty_process_resize(Job *job, uint16_t width, uint16_t height)
{
PtyProcess *ptyproc = job->process;