X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshared%2Fpager.c;h=8f3fc133ba29dab4899ace53d5cbe1c145e8bb99;hp=58b62fdccfab66cd430c5bb304ef4c7dbd3cc2fd;hb=d5673993ad3bf38d0aeba8dbd025d6f4527f0169;hpb=2a7a7d0b0f645b14cf0388b40d747b0ccb0c091e
diff --git a/src/shared/pager.c b/src/shared/pager.c
index 58b62fdcc..8f3fc133b 100644
--- a/src/shared/pager.c
+++ b/src/shared/pager.c
@@ -1,5 +1,3 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
/***
This file is part of systemd.
@@ -19,54 +17,72 @@
along with systemd; If not, see .
***/
-#include
+#include
+#include
+#include
+#include
+#include
#include
-#include
#include
#include
+#include
+#include "copy.h"
+#include "fd-util.h"
+#include "locale-util.h"
+#include "log.h"
+#include "macro.h"
#include "pager.h"
-#include "util.h"
#include "process-util.h"
-#include "macro.h"
+#include "signal-util.h"
+#include "string-util.h"
+#include "strv.h"
#include "terminal-util.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);
+ int r;
- if (n < 0) {
- log_error_errno(errno, "Internal pager failed: %m");
+ r = copy_bytes(STDIN_FILENO, STDOUT_FILENO, (uint64_t) -1, 0);
+ if (r < 0) {
+ log_error_errno(r, "Internal pager failed: %m");
_exit(EXIT_FAILURE);
}
_exit(EXIT_SUCCESS);
}
-int pager_open(bool jump_to_end) {
- int fd[2];
+static int stored_stdout = -1;
+static int stored_stderr = -1;
+static bool stdout_redirected = false;
+static bool stderr_redirected = false;
+
+int pager_open(bool no_pager, bool jump_to_end) {
+ _cleanup_close_pair_ int fd[2] = { -1, -1 };
const char *pager;
pid_t parent_pid;
- int r;
+
+ if (no_pager)
+ return 0;
if (pager_pid > 0)
return 1;
- if ((pager = getenv("SYSTEMD_PAGER")) || (pager = getenv("PAGER")))
- if (!*pager || streq(pager, "cat"))
- return 0;
+ if (terminal_is_dumb())
+ return 0;
+
+ pager = getenv("SYSTEMD_PAGER");
+ if (!pager)
+ pager = getenv("PAGER");
- if (!on_tty())
+ /* If the pager is explicitly turned off, honour it */
+ if (pager && STR_IN_SET(pager, "", "cat"))
return 0;
/* Determine and cache number of columns before we spawn the
* pager so that we get the value from the actual tty */
- columns();
+ (void) columns();
if (pipe(fd) < 0)
return log_error_errno(errno, "Failed to create pager pipe: %m");
@@ -74,26 +90,37 @@ int pager_open(bool jump_to_end) {
parent_pid = getpid();
pager_pid = fork();
- if (pager_pid < 0) {
- r = -errno;
- log_error_errno(errno, "Failed to fork pager: %m");
- safe_close_pair(fd);
- return r;
- }
+ if (pager_pid < 0)
+ return log_error_errno(errno, "Failed to fork pager: %m");
/* In the child start the pager */
if (pager_pid == 0) {
- const char* less_opts;
+ const char* less_opts, *less_charset;
+
+ (void) reset_all_signal_handlers();
+ (void) reset_signal_mask();
- dup2(fd[0], STDIN_FILENO);
+ (void) 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);
+ if (setenv("LESS", less_opts, 1) < 0)
+ _exit(EXIT_FAILURE);
+
+ /* 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) < 0)
+ _exit(EXIT_FAILURE);
/* Make sure the pager goes away when the parent dies */
if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
@@ -125,10 +152,20 @@ int pager_open(bool jump_to_end) {
}
/* Return in the parent */
- if (dup2(fd[1], STDOUT_FILENO) < 0)
+ stored_stdout = fcntl(STDOUT_FILENO, F_DUPFD_CLOEXEC, 3);
+ if (dup2(fd[1], STDOUT_FILENO) < 0) {
+ stored_stdout = safe_close(stored_stdout);
return log_error_errno(errno, "Failed to duplicate pager pipe: %m");
+ }
+ stdout_redirected = true;
+
+ stored_stderr = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 3);
+ if (dup2(fd[1], STDERR_FILENO) < 0) {
+ stored_stderr = safe_close(stored_stderr);
+ return log_error_errno(errno, "Failed to duplicate pager pipe: %m");
+ }
+ stderr_redirected = true;
- safe_close_pair(fd);
return 1;
}
@@ -138,8 +175,19 @@ void pager_close(void) {
return;
/* Inform pager that we are done */
- fclose(stdout);
- kill(pager_pid, SIGCONT);
+ (void) fflush(stdout);
+ if (stdout_redirected)
+ if (stored_stdout < 0 || dup2(stored_stdout, STDOUT_FILENO) < 0)
+ (void) close(STDOUT_FILENO);
+ stored_stdout = safe_close(stored_stdout);
+ (void) fflush(stderr);
+ if (stderr_redirected)
+ if (stored_stderr < 0 || dup2(stored_stderr, STDERR_FILENO) < 0)
+ (void) close(STDERR_FILENO);
+ stored_stderr = safe_close(stored_stderr);
+ stdout_redirected = stderr_redirected = false;
+
+ (void) kill(pager_pid, SIGCONT);
(void) wait_for_terminate(pager_pid, NULL);
pager_pid = 0;
}
@@ -148,6 +196,7 @@ bool pager_have(void) {
return pager_pid > 0;
}
+#if 0 /// UNNEEDED by elogind
int show_man_page(const char *desc, bool null_stdio) {
const char *args[4] = { "man", NULL, NULL, NULL };
char *e = NULL;
@@ -178,6 +227,10 @@ int show_man_page(const char *desc, bool null_stdio) {
if (pid == 0) {
/* Child */
+
+ (void) reset_all_signal_handlers();
+ (void) reset_signal_mask();
+
if (null_stdio) {
r = make_null_stdio();
if (r < 0) {
@@ -198,3 +251,4 @@ int show_man_page(const char *desc, bool null_stdio) {
log_debug("Exit code %i status %i", status.si_code, status.si_status);
return status.si_status;
}
+#endif // 0