tests: move /proc/ checks from scripts to executables

Move most of /proc/self/task/ and /proc/self/fd/ checks from scripts
to xecutables.

* tests/attach-f-p.test: Move /proc/self/task/ check ...
* tests/attach-f-p-cmd.c (main): ... here.
* tests/fstat.test: Move /proc/self/fd/ check ...
* tests/xstatx.c (main): ... here.
* tests/net-y-unix.test: Move /proc/self/fd/ check ...
* tests/net-y-unix.c (main): ... here.
* tests/net-yy-inet.test: Move /proc/self/fd/ check ...
* tests/net-yy-inet.c (main): ... here.
* tests/net-yy-netlink.test: Move /proc/self/fd/ check ...
* tests/net-yy-netlink.c (main): ... here.
* tests/net-yy-unix.test: Move /proc/self/fd/ check ...
* tests/net-yy-unix.c (main): ... here.

tests/attach-f-p-cmd.c

@@ -34,6 +34,8 @@
 int
 main(void)
 {
+	skip_if_unavailable("/proc/self/task/");
+
 	static const char dir[] = "attach-f-p.test cmd";
 	pid_t pid = getpid();
 	int rc = chdir(dir);

tests/attach-f-p.test

@@ -29,9 +29,6 @@
 
 . "${srcdir=.}/init.sh"
 
-# strace -f -p is implemented using /proc/$pid/task/
-[ -d /proc/self/task/ ] ||
-	framework_skip_ '/proc/self/task/ is not available'
 run_prog_skip_if_failed \
 	kill -0 $$
 run_prog ../attach-f-p-cmd > /dev/null

tests/fstat.test

@@ -4,10 +4,6 @@
 
 . "${srcdir=.}/init.sh"
 
-# strace -P is implemented using /proc/self/fd
-[ -d /proc/self/fd/ ] ||
-	framework_skip_ '/proc/self/fd/ is not available'
-
 syscall=$NAME
 run_prog > /dev/null
 sample=$syscall.sample

tests/net-y-unix.c

@@ -43,6 +43,8 @@
 int
 main(void)
 {
+	skip_if_unavailable("/proc/self/fd/");
+
 	static const struct sockaddr_un addr = {
 		.sun_family = AF_UNIX,
 		.sun_path = TEST_SOCKET

tests/net-y-unix.test

@@ -29,13 +29,9 @@
 
 . "${srcdir=.}/init.sh"
 
-# strace -y is implemented using /proc/self/fd
-[ -d /proc/self/fd/ ] ||
-	framework_skip_ '/proc/self/fd/ is not available'
-
 check_prog sed
 
-run_prog "../$NAME" > /dev/null
+run_prog > /dev/null
 run_strace -a20 -y -eclose,network $args > "$EXP"
 
 # Filter out close() calls made by ld.so and libc.

tests/net-yy-inet.c

@@ -41,6 +41,8 @@
 int
 main(void)
 {
+	skip_if_unavailable("/proc/self/fd/");
+
 	const struct sockaddr_in addr = {
 		.sin_family = AF_INET,
 		.sin_addr.s_addr = htonl(INADDR_LOOPBACK)

tests/net-yy-inet.test

@@ -29,14 +29,10 @@
 
 . "${srcdir=.}/init.sh"
 
-# strace -yy is implemented using /proc/self/fd
-[ -d /proc/self/fd/ ] ||
-	framework_skip_ '/proc/self/fd/ is not available'
-
 check_prog sed
 
 run_prog ../netlink_inet_diag
-run_prog "../$NAME" > /dev/null
+run_prog > /dev/null
 run_strace -a22 -yy -eclose,network $args > "$EXP"
 
 # Filter out close() calls made by ld.so and libc.

tests/net-yy-netlink.c

@@ -47,6 +47,8 @@
 int
 main(void)
 {
+	skip_if_unavailable("/proc/self/fd/");
+
 	struct sockaddr_nl addr = {
 		.nl_family = AF_NETLINK,
 		.nl_pid = getpid()

tests/net-yy-netlink.test

@@ -32,14 +32,10 @@
 
 . "${srcdir=.}/init.sh"
 
-# strace -yy is implemented using /proc/self/fd
-[ -d /proc/self/fd/ ] ||
-	framework_skip_ '/proc/self/fd/ is not available'
-
 check_prog sed
 
 run_prog ../netlink_netlink_diag
-run_prog "../$NAME" > /dev/null
+run_prog > /dev/null
 run_strace -a22 -yy -eclose,network $args > "$EXP"
 
 # Filter out close() calls made by ld.so and libc.

tests/net-yy-unix.c

@@ -43,6 +43,8 @@
 int
 main(void)
 {
+	skip_if_unavailable("/proc/self/fd/");
+
 	struct sockaddr_un addr = {
 		.sun_family = AF_UNIX,
 		.sun_path = TEST_SOCKET

tests/net-yy-unix.test

@@ -31,14 +31,10 @@
 
 . "${srcdir=.}/init.sh"
 
-# strace -yy is implemented using /proc/self/fd
-[ -d /proc/self/fd/ ] ||
-	framework_skip_ '/proc/self/fd/ is not available'
-
 check_prog sed
 
 run_prog ../netlink_unix_diag
-run_prog "../$NAME" > /dev/null
+run_prog > /dev/null
 run_strace -a22 -yy -eclose,network $args > "$EXP"
 
 # Filter out close() calls made by ld.so and libc.

tests/xstatx.c

@@ -267,7 +267,9 @@ create_sample(const char *fname, const libc_off_t size)
 int
 main(void)
 {
-# if !IS_FSTAT
+# if IS_FSTAT
+	skip_if_unavailable("/proc/self/fd/");
+# else
 	static const char full[] = "/dev/full";
 # endif
 	static const char sample[] = TEST_SYSCALL_STR ".sample";