Fix adb hang when subprocess dies early.
* Handling of the subprocess and its FD.
This fixes http://b/3400254 "Many bugreports getting hung at the end in monkey"
- Start up a service thread that waits on the subprocess to terminate,
then closes the FD associated with it.
- Have the event handler select() with a timeout so that it can
detect the closed FD. Select() with no timeout does not return when an FD is closed.
- Have the event handler force a read on the closed FD to trigger the close sequence.
- Migrate the "shell:blabla" handling to "#if !ADB_HOST" sections.
* Fix the race around OOM adjusting.
- Do it in the child before exec() instead of the in the parent as the
child could already have started or not (no /proc/pid/... yet).
* Allow for multi-threaded D() invocations to not clobber each other.
- Allow locks across object files.
- Add lock within D()
* Add some missing close(fd) calls
- Match similar existing practices near dup2()
* Add extra D() invocations related to FD handling.
* Warn about using debugging as stderr/stdout is used for protocol.
Change-Id: Ie5c4a5e6bfbe3f22201adf5f9a205d32e069bf9d
Signed-off-by: JP Abgrall <jpa@google.com>
diff --git a/adb/commandline.c b/adb/commandline.c
index 5ed1b52..c897efe 100644
--- a/adb/commandline.c
+++ b/adb/commandline.c
@@ -218,7 +218,9 @@
int len;
while(fd >= 0) {
+ D("read_and_dump(): pre adb_read(fd=%d)\n", fd);
len = adb_read(fd, buf, 4096);
+ D("read_and_dump(): post adb_read(fd=%d): len=%d\n", fd, len);
if(len == 0) {
break;
}
@@ -246,7 +248,9 @@
for(;;) {
/* fdi is really the client's stdin, so use read, not adb_read here */
+ D("stdin_read_thread(): pre unix_read(fdi=%d,...)\n", fdi);
r = unix_read(fdi, buf, 1024);
+ D("stdin_read_thread(): post unix_read(fdi=%d,...)\n", fdi);
if(r == 0) break;
if(r < 0) {
if(errno == EINTR) continue;
@@ -853,6 +857,7 @@
}
if(argc < 2) {
+ D("starting interactive shell\n");
r = interactive_shell();
if (h) {
printf("\x1b[0m");
@@ -877,9 +882,12 @@
}
for(;;) {
+ D("interactive shell loop. buff=%s\n", buf);
fd = adb_connect(buf);
if(fd >= 0) {
+ D("about to read_and_dump(fd=%d)\n", fd);
read_and_dump(fd);
+ D("read_and_dump() done.\n");
adb_close(fd);
r = 0;
} else {
@@ -896,6 +904,7 @@
printf("\x1b[0m");
fflush(stdout);
}
+ D("interactive shell loop. return r=%d\n", r);
return r;
}
}