diff --git a/tests/sigaction.awk b/tests/sigaction.awk
new file mode 100644
index 0000000..2c4eab6
--- /dev/null
+++ b/tests/sigaction.awk
@@ -0,0 +1,36 @@
+# rt_sigaction on ALPHA has 5 args: sig, act, oact, sigsetsize, restorer.
+# rt_sigaction on SPARC has 5 args: sig, act, oact, restorer, sigsetsize.
+# rt_sigaction on other architectures has 4 args: sig, act, oact, sigsetsize.
+# Some architectures have SA_RESTORER, some don't;
+# in particular, SPARC has and ALPHA hasn't.
+#
+# There are two regexps for each test:
+# the 1st is for any architecture with SA_RESTORER, including SPARC;
+# the 2nd is for any architecture without SA_RESTORER, including ALPHA.
+
+# Test 1.
+NR == 1 && /^rt_sigaction\(SIGUSR2, {SIG_IGN, \[HUP INT\], SA_RESTORER\|SA_RESTART, 0x[0-9a-f]+}, {SIG_DFL, \[\], 0}, (0x[0-9a-f]+, )?(4|8|16)\) = 0$/ {next}
+NR == 1 && /^rt_sigaction\(SIGUSR2, {SIG_IGN, \[HUP INT\], SA_RESTART}, {SIG_DFL, \[\], 0}, (4|8|16)(, 0x[0-9a-f]+)?\) = 0$/ {next}
+
+# Test 2.
+NR == 2 && /^rt_sigaction\(SIGUSR2, {0x[0-9a-f]+, \[QUIT TERM\], SA_RESTORER\|SA_SIGINFO, 0x[0-9a-f]+}, {SIG_IGN, \[HUP INT\], SA_RESTORER\|SA_RESTART, 0x[0-9a-f]+}, (0x[0-9a-f]+, )?(4|8|16)\) = 0$/ {next}
+NR == 2 && /^rt_sigaction\(SIGUSR2, {0x[0-9a-f]+, \[QUIT TERM\], SA_SIGINFO}, {SIG_IGN, \[HUP INT\], SA_RESTART}, (4|8|16)(, 0x[0-9a-f]+)?\) = 0$/ {next}
+
+# Test 3.
+NR == 3 && /^rt_sigaction\(SIGUSR2, {SIG_DFL, \[\], SA_RESTORER, 0x[0-9a-f]+}, {0x[0-9a-f]+, \[QUIT TERM\], SA_RESTORER\|SA_SIGINFO, 0x[0-9a-f]+}, (0x[0-9a-f]+, )?(4|8|16)\) = 0$/ {next}
+NR == 3 && /^rt_sigaction\(SIGUSR2, {SIG_DFL, \[\], 0}, {0x[0-9a-f]+, \[QUIT TERM\], SA_SIGINFO}, (4|8|16)(, 0x[0-9a-f]+)?\) = 0$/ {next}
+
+# The last line.
+NR == 4 && /^\+\+\+ exited with 0 \+\+\+$/ {next}
+
+{
+  print "Line " NR " does not match: " $0
+  exit 1
+}
+
+END {
+  if (NR != 4) {
+    print "Expected 4 lines, found " NR " line(s)."
+    exit 1
+  }
+}