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macro: use C11 static_assert() macro for static assertions
[elogind.git]
/
src
/
shared
/
pager.c
diff --git
a/src/shared/pager.c
b/src/shared/pager.c
index 6a85af33c475b6749911af3d6cf61e27acc6b649..488a12c763839f156471d1b56606fae5f06b8188 100644
(file)
--- a/
src/shared/pager.c
+++ b/
src/shared/pager.c
@@
-44,20
+44,21
@@
_noreturn_ static void pager_fallback(void) {
_exit(EXIT_SUCCESS);
}
_exit(EXIT_SUCCESS);
}
-
void
pager_open(void) {
+
int
pager_open(void) {
int fd[2];
const char *pager;
pid_t parent_pid;
int fd[2];
const char *pager;
pid_t parent_pid;
+ int r;
if (pager_pid > 0)
if (pager_pid > 0)
- return;
+ return
1
;
if ((pager = getenv("SYSTEMD_PAGER")) || (pager = getenv("PAGER")))
if (!*pager || streq(pager, "cat"))
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 */
/* Determine and cache number of columns before we spawn the
* pager so that we get the value from the actual tty */
@@
-65,16
+66,17
@@
void pager_open(void) {
if (pipe(fd) < 0) {
log_error("Failed to create pager pipe: %m");
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) {
}
parent_pid = getpid();
pager_pid = fork();
if (pager_pid < 0) {
+ r = -errno;
log_error("Failed to fork pager: %m");
close_pipe(fd);
log_error("Failed to fork pager: %m");
close_pipe(fd);
- return;
+ return
r
;
}
/* In the child start the pager */
}
/* In the child start the pager */
@@
-115,10
+117,13
@@
void pager_open(void) {
}
/* Return in the parent */
}
/* 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");
log_error("Failed to duplicate pager pipe: %m");
+ return -errno;
+ }
close_pipe(fd);
close_pipe(fd);
+ return 1;
}
void pager_close(void) {
}
void pager_close(void) {
@@
-132,3
+137,7
@@
void pager_close(void) {
wait_for_terminate(pager_pid, NULL);
pager_pid = 0;
}
wait_for_terminate(pager_pid, NULL);
pager_pid = 0;
}
+
+bool pager_have(void) {
+ return pager_pid > 0;
+}