Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
+ You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
_exit(EXIT_SUCCESS);
}
-void 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;
+ return 1;
if ((pager = getenv("SYSTEMD_PAGER")) || (pager = getenv("PAGER")))
if (!*pager || streq(pager, "cat"))
- return;
+ return 0;
- if (isatty(STDOUT_FILENO) <= 0)
- return;
+ 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 */
if (pipe(fd) < 0) {
log_error("Failed to create pager pipe: %m");
- return;
+ 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;
+ return r;
}
/* In the child start the pager */
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)
}
/* Return in the parent */
- if (dup2(fd[1], STDOUT_FILENO) < 0)
+ if (dup2(fd[1], STDOUT_FILENO) < 0) {
log_error("Failed to duplicate pager pipe: %m");
+ return -errno;
+ }
close_pipe(fd);
+ return 1;
}
void pager_close(void) {
wait_for_terminate(pager_pid, NULL);
pager_pid = 0;
}
+
+bool pager_have(void) {
+ return pager_pid > 0;
+}