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pager: add a trivial internal pager

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In the very unlikely scenario where none of the external pagers is
available, use an internal implementation to pass stdin to stdout.

Don't bother with trying 'cat', because it's no more useful than the
internal pager.

https://bugzilla.redhat.com/show_bug.cgi?id=713707
This commit is contained in:
Michal Schmidt 2011-09-26 23:02:56 +02:00
parent 7c83341a59
commit 4a8e40ebd0
1 changed files with 15 additions and 3 deletions
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18
src/pager.c
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@ -20,6 +20,7 @@
***/ ***/
#include <sys/types.h> #include <sys/types.h>
#include <fcntl.h>
#include <stdlib.h> #include <stdlib.h>
#include <unistd.h> #include <unistd.h>
#include <string.h> #include <string.h>
@ -31,6 +32,18 @@
static pid_t pager_pid = 0; static pid_t pager_pid = 0;
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);
}
void pager_open(void) { void pager_open(void) {
int fd[2]; int fd[2];
const char *pager; const char *pager;
@ -96,10 +109,9 @@ void pager_open(void) {
execlp("less", "less", NULL); execlp("less", "less", NULL);
execlp("more", "more", NULL); execlp("more", "more", NULL);
execlp("cat", "cat", NULL);
log_error("Unable to execute pager: %m"); pager_fallback();
_exit(EXIT_FAILURE); /* not reached */
} }
/* Return in the parent */ /* Return in the parent */