handle EINTR while polling scripts/hooks

If poll() is interrupted by a signal, alpm was closing the socket it
uses for listening to script/hook output.  This would drop script output
at the least and kill the script at the worst.

Fixes FS#60396

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

2 files changed, 16 insertions, 0 deletions

diff --git a/test/pacman/tests/TESTS b/test/pacman/tests/TESTS
index 5deb93c4..dc0b4ec3 100644
--- a/test/pacman/tests/TESTS
+++ b/test/pacman/tests/TESTS
@@ -150,6 +150,7 @@ TESTS += test/pacman/tests/replace102.py
 TESTS += test/pacman/tests/replace103.py
 TESTS += test/pacman/tests/replace104.py
 TESTS += test/pacman/tests/replace110.py
+TESTS += test/pacman/tests/scriptlet-signal-handling.py
 TESTS += test/pacman/tests/scriptlet-signal-reset.py
 TESTS += test/pacman/tests/scriptlet001.py
 TESTS += test/pacman/tests/scriptlet002.py
diff --git a/test/pacman/tests/scriptlet-signal-handling.py b/test/pacman/tests/scriptlet-signal-handling.py
new file mode 100644
index 00000000..e65df55b
--- /dev/null
+++ b/test/pacman/tests/scriptlet-signal-handling.py
@@ -0,0 +1,15 @@
+self.description = "Handle signal interrupts while running scriptlets/hooks"
+
+p1 = pmpkg("dummy")
+p1.install['post_install'] = """
+	kill -INT $PPID  # send an arbitrary signal that pacman catches
+	sleep 1          # give alpm time to close the socket if EINTR was not handled
+	echo to-parent   # if the interrupt is not handled this will die with SIGPIPE
+	echo success > interrupt_was_handled
+	"""
+self.addpkg(p1)
+
+self.args = "-U %s" % p1.filename()
+
+self.addrule("PACMAN_RETCODE=0")
+self.addrule("FILE_EXIST=interrupt_was_handled")