along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
-#include <sys/types.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include "pager.h"
#include "util.h"
+#include "process-util.h"
#include "macro.h"
+#include "terminal-util.h"
+#include "signal-util.h"
+#include "copy.h"
static pid_t pager_pid = 0;
-_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");
+noreturn static void pager_fallback(void) {
+ int r;
+
+ r = copy_bytes(STDIN_FILENO, STDOUT_FILENO, (off_t) -1, false);
+ if (r < 0) {
+ log_error_errno(r, "Internal pager failed: %m");
_exit(EXIT_FAILURE);
}
+
_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 */
columns();
- if (pipe(fd) < 0) {
- log_error("Failed to create pager pipe: %m");
- return;
- }
+ if (pipe(fd) < 0)
+ return log_error_errno(errno, "Failed to create pager pipe: %m");
parent_pid = getpid();
pager_pid = fork();
if (pager_pid < 0) {
- log_error("Failed to fork pager: %m");
- close_pipe(fd);
- return;
+ r = -errno;
+ log_error_errno(errno, "Failed to fork pager: %m");
+ safe_close_pair(fd);
+ return r;
}
/* In the child start the pager */
if (pager_pid == 0) {
+ const char* less_opts, *less_charset;
- dup2(fd[0], STDIN_FILENO);
- close_pipe(fd);
+ (void) reset_all_signal_handlers();
+ (void) reset_signal_mask();
- setenv("LESS", "FRSX", 0);
+ dup2(fd[0], STDIN_FILENO);
+ safe_close_pair(fd);
+
+ /* Initialize a good set of less options */
+ less_opts = getenv("SYSTEMD_LESS");
+ if (!less_opts)
+ less_opts = "FRSXMK";
+ if (jump_to_end)
+ less_opts = strjoina(less_opts, " +G");
+ setenv("LESS", less_opts, 1);
+
+ /* Initialize a good charset for less. This is
+ * particularly important if we output UTF-8
+ * characters. */
+ less_charset = getenv("SYSTEMD_LESSCHARSET");
+ if (!less_charset && is_locale_utf8())
+ less_charset = "utf-8";
+ if (less_charset)
+ setenv("LESSCHARSET", less_charset, 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)
- log_error("Failed to duplicate pager pipe: %m");
+ return log_error_errno(errno, "Failed to duplicate pager pipe: %m");
+ if (dup2(fd[1], STDERR_FILENO) < 0)
+ return log_error_errno(errno, "Failed to duplicate pager pipe: %m");
- close_pipe(fd);
+ safe_close_pair(fd);
+ return 1;
}
void pager_close(void) {
/* Inform pager that we are done */
fclose(stdout);
+#if defined(__GLIBC__)
+ stdout = NULL;
+#endif // in musl-libc this is a const
+
+ fclose(stderr);
+#if defined(__GLIBC__)
+ stderr = NULL;
+#endif // in musl-libc this is a const
+
kill(pager_pid, SIGCONT);
- wait_for_terminate(pager_pid, NULL);
+ (void) wait_for_terminate(pager_pid, NULL);
pager_pid = 0;
}
+
+bool pager_have(void) {
+ return pager_pid > 0;
+}
+
+/// UNNEEDED by elogind
+#if 0
+int show_man_page(const char *desc, bool null_stdio) {
+ const char *args[4] = { "man", NULL, NULL, NULL };
+ char *e = NULL;
+ pid_t pid;
+ size_t k;
+ int r;
+ siginfo_t status;
+
+ k = strlen(desc);
+
+ if (desc[k-1] == ')')
+ e = strrchr(desc, '(');
+
+ if (e) {
+ char *page = NULL, *section = NULL;
+
+ page = strndupa(desc, e - desc);
+ section = strndupa(e + 1, desc + k - e - 2);
+
+ args[1] = section;
+ args[2] = page;
+ } else
+ args[1] = desc;
+
+ pid = fork();
+ if (pid < 0)
+ return log_error_errno(errno, "Failed to fork: %m");
+
+ if (pid == 0) {
+ /* Child */
+
+ (void) reset_all_signal_handlers();
+ (void) reset_signal_mask();
+
+ if (null_stdio) {
+ r = make_null_stdio();
+ if (r < 0) {
+ log_error_errno(r, "Failed to kill stdio: %m");
+ _exit(EXIT_FAILURE);
+ }
+ }
+
+ execvp(args[0], (char**) args);
+ log_error_errno(errno, "Failed to execute man: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ r = wait_for_terminate(pid, &status);
+ if (r < 0)
+ return r;
+
+ log_debug("Exit code %i status %i", status.si_code, status.si_status);
+ return status.si_status;
+}
+#endif // 0