port: FreeBSD has no LOGIN_NAME_MAX, use sysconf instead

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Id058e15608ce0332500343ce389365a6fb1a40cc

diff --git a/src/bin/lttng-sessiond/client.c b/src/bin/lttng-sessiond/client.c
index 8a2ef85b7345c33d89cd2914134bd075a71b4e9e..d7db03fa76981f38ac60b3eb9e78579c9512fa4b 100644 (file)
--- a/src/bin/lttng-sessiond/client.c
+++ b/src/bin/lttng-sessiond/client.c
@@ -31,6 +31,7 @@
 #include <signal.h>
 #include <stddef.h>
 #include <sys/stat.h>
+#include <unistd.h>
 
 #include "client.h"
 #include "lttng-sessiond.h"
@@ -1281,9 +1282,17 @@ error_add_context:
                                                .value_type;
                struct process_attr_value *value;
                enum lttng_error_code ret_code;
+               long login_name_max;
+
+               login_name_max = sysconf(_SC_LOGIN_NAME_MAX);
+               if (login_name_max < 0) {
+                       PERROR("Failed to get _SC_LOGIN_NAME_MAX system configuration");
+                       ret = LTTNG_ERR_INVALID;
+                       goto error;
+               }
 
                /* Receive remaining variable length payload if applicable. */
-               if (name_len > LOGIN_NAME_MAX) {
+               if (name_len > login_name_max) {
                        /*
                         * POSIX mandates user and group names that are at least
                         * 8 characters long. Note that although shadow-utils
@@ -1291,9 +1300,9 @@ error_add_context:
                         * limit (from bits/utmp.h, UT_NAMESIZE),
                         * LOGIN_NAME_MAX is defined to 256.
                         */
-                       ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %d",
+                       ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %ld",
                                        add_value ? "addition" : "removal",
-                                       name_len, LOGIN_NAME_MAX);
+                                       name_len, login_name_max);
                        ret = LTTNG_ERR_INVALID;
                        goto error;
                }