tests: extend test coverage of setresgid syscall

* tests/setresgid.c: New file.
* tests/setresgid.test: New test.
* tests/.gitignore: Add setresgid.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add setresgid.test.

tests/.gitignore

@@ -147,6 +147,7 @@ setgid32
 sethostname
 setregid
 setregid32
+setresgid
 setresuid
 setresuid32
 setreuid

tests/Makefile.am

@@ -197,6 +197,7 @@ check_PROGRAMS = \
 	sethostname \
 	setregid \
 	setregid32 \
+	setresgid \
 	setresuid \
 	setresuid32 \
 	setreuid \
@@ -414,6 +415,7 @@ DECODER_TESTS = \
 	sethostname.test \
 	setregid.test \
 	setregid32.test \
+	setresgid.test \
 	setresuid.test \
 	setresuid32.test \
 	setreuid.test \

tests/setresgid.c

@@ -0,0 +1,25 @@
+#include "tests.h"
+#include <sys/syscall.h>
+
+#ifdef __NR_setresgid
+
+# define SYSCALL_NR	__NR_setresgid
+# define SYSCALL_NAME	"setresgid"
+
+# if defined __NR_setresgid32 && __NR_setresgid != __NR_setresgid32
+#  define UGID_TYPE	short
+#  define GETUGID	syscall(__NR_getegid)
+#  define CHECK_OVERFLOWUGID(arg)	check_overflowgid(arg)
+# else
+#  define UGID_TYPE	int
+#  define GETUGID	getegid()
+#  define CHECK_OVERFLOWUGID(arg)
+# endif
+
+# include "setresugid.c"
+
+#else
+
+SKIP_MAIN_UNDEFINED("__NR_setresgid")
+
+#endif

tests/setresgid.test

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# Check setresgid syscall decoding.
+
+. "${srcdir=.}/init.sh"
+run_strace_match_diff -a19