tests: add sethostname.test

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

tests/.gitignore

@@ -118,6 +118,7 @@ select
 sendfile
 sendfile64
 set_ptracer_any
+sethostname
 sigaction
 sigaltstack
 signalfd

tests/Makefile.am

@@ -167,6 +167,7 @@ check_PROGRAMS = \
 	sendfile \
 	sendfile64 \
 	set_ptracer_any \
+	sethostname \
 	sigaction \
 	sigaltstack \
 	signalfd \
@@ -343,6 +344,7 @@ DECODER_TESTS = \
 	select.test \
 	sendfile.test \
 	sendfile64.test \
+	sethostname.test \
 	sigaction.test \
 	sigaltstack.test \
 	signalfd.test \

tests/sethostname.c

@@ -0,0 +1,37 @@
+#include "tests.h"
+#include <sys/syscall.h>
+
+#ifdef __NR_sethostname
+
+# include <errno.h>
+# include <stdio.h>
+# include <unistd.h>
+
+int
+main(void)
+{
+	const char *hostname = NULL;
+	int rc = syscall(__NR_sethostname, hostname, 63);
+	const char *errno_text;
+	switch (errno) {
+		case ENOSYS:
+			errno_text = "ENOSYS";
+			break;
+		case EPERM:
+			errno_text = "EPERM";
+			break;
+		default:
+			errno_text = "EFAULT";
+	}
+	printf("sethostname(NULL, %d) = %d %s (%m)\n",
+	       63, rc, errno_text);
+
+	puts("+++ exited with 0 +++");
+	return 0;
+}
+
+#else
+
+SKIP_MAIN_UNDEFINED("__NR_sethostname")
+
+#endif

tests/sethostname.test

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# Check sethostname syscall decoding.
+
+. "${srcdir=.}/init.sh"
+run_strace_match_diff -a22