X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Fpager.c;h=72a29f22855ea569a4bbdc8a713ec36a63da07ae;hb=c9ccc19f9eb0599109094c57b7a2f668d708f0c1;hp=36b409c07031932843c5994209d8daa3bed44fc9;hpb=fafb6eccc2c9e3f8d6ce0aad9cb428f8cc402b24;p=elogind.git

diff --git a/src/shared/pager.c b/src/shared/pager.c
index 36b409c07..72a29f228 100644
--- a/src/shared/pager.c
+++ b/src/shared/pager.c
@@ -32,32 +32,36 @@
 
 static pid_t pager_pid = 0;
 
-_noreturn_ static void pager_fallback(void) {
+noreturn static void pager_fallback(void) {
         ssize_t n;
+
         do {
                 n = splice(STDIN_FILENO, NULL, STDOUT_FILENO, NULL, 64*1024, 0);
         } while (n > 0);
+
         if (n < 0) {
                 log_error("Internal pager failed: %m");
                 _exit(EXIT_FAILURE);
         }
+
         _exit(EXIT_SUCCESS);
 }
 
-bool pager_open(void) {
+int pager_open(bool jump_to_end) {
         int fd[2];
         const char *pager;
         pid_t parent_pid;
+        int r;
 
         if (pager_pid > 0)
-                return false;
+                return 1;
 
         if ((pager = getenv("SYSTEMD_PAGER")) || (pager = getenv("PAGER")))
                 if (!*pager || streq(pager, "cat"))
-                        return false;
+                        return 0;
 
-        if (isatty(STDOUT_FILENO) <= 0)
-                return false;
+        if (!on_tty())
+                return 0;
 
         /* Determine and cache number of columns before we spawn the
          * pager so that we get the value from the actual tty */
@@ -65,16 +69,17 @@ bool pager_open(void) {
 
         if (pipe(fd) < 0) {
                 log_error("Failed to create pager pipe: %m");
-                return false;
+                return -errno;
         }
 
         parent_pid = getpid();
 
         pager_pid = fork();
         if (pager_pid < 0) {
+                r = -errno;
                 log_error("Failed to fork pager: %m");
                 close_pipe(fd);
-                return false;
+                return r;
         }
 
         /* In the child start the pager */
@@ -83,7 +88,10 @@ bool pager_open(void) {
                 dup2(fd[0], STDIN_FILENO);
                 close_pipe(fd);
 
-                setenv("LESS", "FRSX", 0);
+                if (jump_to_end)
+                        setenv("LESS", "FRSXMK+G", 1);
+                else
+                        setenv("LESS", "FRSXMK", 1);
 
                 /* Make sure the pager goes away when the parent dies */
                 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
@@ -117,11 +125,11 @@ bool pager_open(void) {
         /* Return in the parent */
         if (dup2(fd[1], STDOUT_FILENO) < 0) {
                 log_error("Failed to duplicate pager pipe: %m");
-                return false;
+                return -errno;
         }
 
         close_pipe(fd);
-        return true;
+        return 1;
 }
 
 void pager_close(void) {
@@ -135,3 +143,7 @@ void pager_close(void) {
         wait_for_terminate(pager_pid, NULL);
         pager_pid = 0;
 }
+
+bool pager_have(void) {
+        return pager_pid > 0;
+}