agetty: call uname() only when necessary

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/term-utils/agetty.c b/term-utils/agetty.c
index 3ad3612cd4aa51aa910b89c8a457660d962a03da..b73884828bca737770ab94a9db1c8410d0297c19 100644 (file)
--- a/term-utils/agetty.c
+++ b/term-utils/agetty.c
@@ -2342,8 +2342,6 @@ static void output_special_char(unsigned char c, struct options *op,
 {
        struct utsname uts;
 
-       uname(&uts);
-
        switch (c) {
        case 'e':
        {
@@ -2358,18 +2356,23 @@ static void output_special_char(unsigned char c, struct options *op,
                break;
        }
        case 's':
+               uname(&uts);
                printf("%s", uts.sysname);
                break;
        case 'n':
+               uname(&uts);
                printf("%s", uts.nodename);
                break;
        case 'r':
+               uname(&uts);
                printf("%s", uts.release);
                break;
        case 'v':
+               uname(&uts);
                printf("%s", uts.version);
                break;
        case 'm':
+               uname(&uts);
                printf("%s", uts.machine);
                break;
        case 'o':
@@ -2461,6 +2464,7 @@ static void output_special_char(unsigned char c, struct options *op,
 
                /* \S and PRETTY_NAME not found */
                } else {
+                       uname(&uts);
                        fputs(uts.sysname, stdout);
                }
                break;