X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshared%2Fpager.c;h=9a097a16514eea53be7a0bd640a47bb2ac2d3845;hp=286394072567458582e852e5af9236337d44b968;hb=13dd6787f18f0cfbd9838659084b39b759be9827;hpb=56f64d95763a799ba4475daf44d8e9f72a1bd474

diff --git a/src/shared/pager.c b/src/shared/pager.c
index 286394072..9a097a165 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.
 
@@ -19,82 +17,105 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include <sys/types.h>
-#include <fcntl.h>
+#include <errno.h>
+#include <signal.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
 #include <stdlib.h>
-#include <unistd.h>
 #include <string.h>
 #include <sys/prctl.h>
+#include <unistd.h>
 
-#include "pager.h"
-#include "util.h"
+#include "copy.h"
+#include "fd-util.h"
+#include "locale-util.h"
+#include "log.h"
 #include "macro.h"
+#include "pager.h"
+#include "process-util.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];
+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) {
-                log_error_errno(errno, "Failed to create pager pipe: %m");
-                return -errno;
-        }
+        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) {
-                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;
 
-                dup2(fd[0], STDIN_FILENO);
+                (void) reset_all_signal_handlers();
+                (void) reset_signal_mask();
+
+                (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 = strappenda(less_opts, " +G");
-                setenv("LESS", less_opts, 1);
+                        less_opts = strjoina(less_opts, " +G");
+                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)
@@ -126,12 +147,11 @@ int pager_open(bool jump_to_end) {
         }
 
         /* Return in the parent */
-        if (dup2(fd[1], STDOUT_FILENO) < 0) {
-                log_error_errno(errno, "Failed to duplicate pager pipe: %m");
-                return -errno;
-        }
+        if (dup2(fd[1], STDOUT_FILENO) < 0)
+                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");
 
-        safe_close_pair(fd);
         return 1;
 }
 
@@ -141,8 +161,8 @@ void pager_close(void) {
                 return;
 
         /* Inform pager that we are done */
-        fclose(stdout);
-        kill(pager_pid, SIGCONT);
+
+        (void) kill(pager_pid, SIGCONT);
         (void) wait_for_terminate(pager_pid, NULL);
         pager_pid = 0;
 }
@@ -151,6 +171,7 @@ 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;
@@ -176,13 +197,15 @@ int show_man_page(const char *desc, bool null_stdio) {
                 args[1] = desc;
 
         pid = fork();
-        if (pid < 0) {
-                log_error_errno(errno, "Failed to fork: %m");
-                return -errno;
-        }
+        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) {
@@ -203,3 +226,4 @@ 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