core: add support for naming file descriptors passed using socket activation

This adds support for naming file descriptors passed using socket
activation. The names are passed in a new $LISTEN_FDNAMES= environment
variable, that matches the existign $LISTEN_FDS= one and contains a
colon-separated list of names.

This also adds support for naming fds submitted to the per-service fd
store using FDNAME= in the sd_notify() message.

This also adds a new FileDescriptorName= setting for socket unit files
to set the name for fds created by socket units.

This also adds a new call sd_listen_fds_with_names(), that is similar to
sd_listen_fds(), but also returns the names of the fds.

systemd-activate gained the new --fdname= switch to specify a name for
testing socket activation.

This is based on #1247 by Maciej Wereski.

Fixes #1247.

src/test/test-daemon.c

@@ -21,9 +21,22 @@
 
 #include <unistd.h>
 
-#include "systemd/sd-daemon.h"
+#include "sd-daemon.h"
+
+#include "strv.h"
 
 int main(int argc, char*argv[]) {
+        _cleanup_strv_free_ char **l = NULL;
+        int n, i;
+
+        n = sd_listen_fds_with_names(false, &l);
+        if (n < 0) {
+                log_error_errno(n, "Failed to get listening fds: %m");
+                return EXIT_FAILURE;
+        }
+
+        for (i = 0; i < n; i++)
+                log_info("fd=%i name=%s\n", SD_LISTEN_FDS_START + i, l[i]);
 
         sd_notify(0,
                   "STATUS=Starting up");
@@ -49,5 +62,5 @@ int main(int argc, char*argv[]) {
                   "STOPPING=1");
         sleep(5);
 
-        return 0;
+        return EXIT_SUCCESS;
 }

src/test/test-strv.c

@@ -155,7 +155,7 @@ static void test_strv_join(void) {
 
 static void test_strv_quote_unquote(const char* const *split, const char *quoted) {
         _cleanup_free_ char *p;
-        _cleanup_strv_free_ char **s;
+        _cleanup_strv_free_ char **s = NULL;
         char **t;
         int r;
 
@@ -166,7 +166,7 @@ static void test_strv_quote_unquote(const char* const *split, const char *quoted
         assert_se(streq(p, quoted));
 
         r = strv_split_extract(&s, quoted, WHITESPACE, EXTRACT_QUOTES);
-        assert_se(r == 0);
+        assert_se(r == (int) strv_length(s));
         assert_se(s);
         STRV_FOREACH(t, s) {
                 assert_se(*t);
@@ -183,7 +183,7 @@ static void test_strv_unquote(const char *quoted, char **list) {
         int r;
 
         r = strv_split_extract(&s, quoted, WHITESPACE, EXTRACT_QUOTES);
-        assert_se(r == 0);
+        assert_se(r == (int) strv_length(list));
         assert_se(s);
         j = strv_join(s, " | ");
         assert_se(j);
@@ -225,7 +225,7 @@ static void test_strv_split_extract(void) {
         int r;
 
         r = strv_split_extract(&l, str, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
-        assert_se(r == 0);
+        assert_se(r == (int) strv_length(l));
         assert_se(streq_ptr(l[0], ""));
         assert_se(streq_ptr(l[1], "foo:bar"));
         assert_se(streq_ptr(l[2], ""));
@@ -591,6 +591,33 @@ static void test_strv_skip(void) {
         test_strv_skip_one(STRV_MAKE(NULL), 55, STRV_MAKE(NULL));
 }
 
+static void test_strv_extend_n(void) {
+        _cleanup_strv_free_ char **v = NULL;
+
+        v = strv_new("foo", "bar", NULL);
+        assert_se(v);
+
+        assert_se(strv_extend_n(&v, "waldo", 3) >= 0);
+        assert_se(strv_extend_n(&v, "piep", 2) >= 0);
+
+        assert_se(streq(v[0], "foo"));
+        assert_se(streq(v[1], "bar"));
+        assert_se(streq(v[2], "waldo"));
+        assert_se(streq(v[3], "waldo"));
+        assert_se(streq(v[4], "waldo"));
+        assert_se(streq(v[5], "piep"));
+        assert_se(streq(v[6], "piep"));
+        assert_se(v[7] == NULL);
+
+        v = strv_free(v);
+
+        assert_se(strv_extend_n(&v, "foo", 1) >= 0);
+        assert_se(strv_extend_n(&v, "bar", 0) >= 0);
+
+        assert_se(streq(v[0], "foo"));
+        assert_se(v[1] == NULL);
+}
+
 int main(int argc, char *argv[]) {
         test_specifier_printf();
         test_strv_foreach();
@@ -650,6 +677,7 @@ int main(int argc, char *argv[]) {
         test_strv_reverse();
         test_strv_shell_escape();
         test_strv_skip();
+        test_strv_extend_n();
 
         return 0;
 }