Move DEFINE_TRIVIAL_CLEANUP_FUNC to macro.h

[elogind.git] / src / shared / pager.c

diff --git a/src/shared/pager.c b/src/shared/pager.c
index 002e3aa37356c7b0f556dd635bcacade31c7d502..a9f2b7e4f493785886e510ec590d6bfef65fb45d 100644 (file)
--- a/src/shared/pager.c
+++ b/src/shared/pager.c
@@ -40,7 +40,7 @@ noreturn static void pager_fallback(void) {
         } while (n > 0);
 
         if (n < 0) {
-                log_error("Internal pager failed: %m");
+                log_error_errno(errno, "Internal pager failed: %m");
                 _exit(EXIT_FAILURE);
         }
 
@@ -67,17 +67,15 @@ int pager_open(bool jump_to_end) {
          * 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 -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("Failed to fork pager: %m");
+                log_error_errno(errno, "Failed to fork pager: %m");
                 safe_close_pair(fd);
                 return r;
         }
@@ -126,10 +124,8 @@ int pager_open(bool jump_to_end) {
         }
 
         /* Return in the parent */
-        if (dup2(fd[1], STDOUT_FILENO) < 0) {
-                log_error("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");
 
         safe_close_pair(fd);
         return 1;
@@ -143,10 +139,61 @@ void pager_close(void) {
         /* Inform pager that we are done */
         fclose(stdout);
         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;
 }
+
+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 */
+                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;
+}