diff options
Diffstat (limited to 'src/shared/pager.c')
| -rw-r--r-- | src/shared/pager.c | 226 |
1 files changed, 0 insertions, 226 deletions
diff --git a/src/shared/pager.c b/src/shared/pager.c deleted file mode 100644 index c16bc027be..0000000000 --- a/src/shared/pager.c +++ /dev/null @@ -1,226 +0,0 @@ -/*** - This file is part of systemd. - - Copyright 2010 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <errno.h> -#include <signal.h> -#include <stddef.h> -#include <stdint.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <sys/prctl.h> -#include <unistd.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 "terminal-util.h" - -static pid_t pager_pid = 0; - -noreturn static void pager_fallback(void) { - int r; - - 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); - } - - _exit(EXIT_SUCCESS); -} - -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; - - if (no_pager) - return 0; - - if (pager_pid > 0) - return 1; - - if (!on_tty()) - return 0; - - 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 */ - (void) columns(); - - 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) - return log_error_errno(errno, "Failed to fork pager: %m"); - - /* In the child start the pager */ - if (pager_pid == 0) { - const char* less_opts, *less_charset; - - (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 = 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); - - /* Check whether our parent died before we were able - * to set the death signal */ - if (getppid() != parent_pid) - _exit(EXIT_SUCCESS); - - if (pager) { - execlp(pager, pager, NULL); - execl("/bin/sh", "sh", "-c", pager, NULL); - } - - /* Debian's alternatives command for pagers is - * called 'pager'. Note that we do not call - * sensible-pagers here, since that is just a - * shell script that implements a logic that - * is similar to this one anyway, but is - * Debian-specific. */ - execlp("pager", "pager", NULL); - - execlp("less", "less", NULL); - execlp("more", "more", NULL); - - pager_fallback(); - /* not reached */ - } - - /* 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"); - - return 1; -} - -void pager_close(void) { - - if (pager_pid <= 0) - return; - - /* Inform pager that we are done */ - stdout = safe_fclose(stdout); - stderr = safe_fclose(stderr); - - (void) kill(pager_pid, SIGCONT); - (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 */ - - (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; -} |