X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshared%2Fpager.c;h=de30de9e75e255a63d5779df7190731e57288991;hp=b5a584ba0159f564147392d197a6870b1dc873cb;hb=94c5f7fa9e34517edad75cd63d71dd459ec4f133;hpb=901cf821ac8c13c78e1acb884f59baf41316fb8f

diff --git a/src/shared/pager.c b/src/shared/pager.c
index b5a584ba0..de30de9e7 100644
--- a/src/shared/pager.c
+++ b/src/shared/pager.c
@@ -21,26 +21,29 @@
 
 #include <fcntl.h>
 #include <stdlib.h>
-#include <unistd.h>
 #include <string.h>
 #include <sys/prctl.h>
+#include <unistd.h>
 
+#include "copy.h"
+#include "fd-util.h"
+#include "locale-util.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 "terminal-util.h"
+#include "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, false);
+        if (r < 0) {
+                log_error_errno(r, "Internal pager failed: %m");
                 _exit(EXIT_FAILURE);
         }
 
@@ -48,24 +51,27 @@ noreturn static void pager_fallback(void) {
 }
 
 int pager_open(bool jump_to_end) {
-        int fd[2];
+        _cleanup_close_pair_ int fd[2] = { -1, -1 };
         const char *pager;
         pid_t parent_pid;
-        int r;
 
         if (pager_pid > 0)
                 return 1;
 
-        if ((pager = getenv("SYSTEMD_PAGER")) || (pager = getenv("PAGER")))
-                if (!*pager || streq(pager, "cat"))
+        if (!on_tty())
                         return 0;
 
-        if (!on_tty())
+        pager = getenv("SYSTEMD_PAGER");
+        if (!pager)
+                pager = getenv("PAGER");
+
+        /* If the pager is explicitly turned off, honour it */
+        if (pager && (pager[0] == 0 || streq(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");
@@ -73,20 +79,20 @@ 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;
 
-                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";
@@ -94,6 +100,15 @@ int pager_open(bool 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)
                         _exit(EXIT_FAILURE);
@@ -126,8 +141,9 @@ int pager_open(bool jump_to_end) {
         /* Return in the parent */
         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;
 }
 
@@ -137,8 +153,15 @@ void pager_close(void) {
                 return;
 
         /* Inform pager that we are done */
-        fclose(stdout);
-        kill(pager_pid, SIGCONT);
+#if defined(__GLIBC__)
+        stdout = safe_fclose(stdout);
+        stderr = safe_fclose(stderr);
+#else
+        (void) safe_fclose(stdout);
+        (void) safe_fclose(stderr);
+#endif // in musl-libc these are const
+
+        (void) kill(pager_pid, SIGCONT);
         (void) wait_for_terminate(pager_pid, NULL);
         pager_pid = 0;
 }
@@ -147,6 +170,8 @@ 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;
@@ -177,6 +202,10 @@ 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) {
@@ -197,3 +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