void sys_wait_command (void) { int status; if (global_pid < 0) return; signal (SIGPIPE, pipe_handler); while (waitpid (global_pid, &status, 0) == -1) if (errno != EINTR) { global_pid = -1; waitpid_error (to_command_option); return; } if (WIFEXITED (status)) { if (!ignore_command_error_option && WEXITSTATUS (status)) ERROR ((0, 0, _("%lu: Child returned status %d"), (unsigned long) global_pid, WEXITSTATUS (status))); } else if (WIFSIGNALED (status)) { WARN ((0, 0, _("%lu: Child terminated on signal %d"), (unsigned long) global_pid, WTERMSIG (status))); } else ERROR ((0, 0, _("%lu: Child terminated on unknown reason"), (unsigned long) global_pid)); global_pid = -1; }
void sys_wait_for_child (pid_t child_pid, bool eof) { if (child_pid) { int wait_status; while (waitpid (child_pid, &wait_status, 0) == -1) if (errno != EINTR) { waitpid_error (use_compress_program_option); break; } if (WIFSIGNALED (wait_status)) { int sig = WTERMSIG (wait_status); if (!(!eof && sig == SIGPIPE)) FATAL_ERROR ((0, 0, _("Child died with signal %d"), sig)); } else if (WEXITSTATUS (wait_status) != 0) FATAL_ERROR ((0, 0, _("Child returned status %d"), WEXITSTATUS (wait_status))); } }
void sys_spawn_shell (void) { pid_t child; const char *shell = getenv ("SHELL"); if (! shell) shell = "/bin/sh"; child = xfork (); if (child == 0) { priv_set_restore_linkdir (); execlp (shell, "-sh", "-i", NULL); exec_fatal (shell); } else { int wait_status; while (waitpid (child, &wait_status, 0) == -1) if (errno != EINTR) { waitpid_error (shell); break; } } }
void sys_exec_checkpoint_script (const char *script_name, const char *archive_name, int checkpoint_number) { pid_t pid; char *argv[4]; char uintbuf[UINTMAX_STRSIZE_BOUND]; pid = xfork (); if (pid != 0) { /* Master */ int status; while (waitpid (pid, &status, 0) == -1) if (errno != EINTR) { waitpid_error (script_name); break; } return; } /* Child */ setenv ("TAR_VERSION", PACKAGE_VERSION, 1); setenv ("TAR_ARCHIVE", archive_name, 1); setenv ("TAR_CHECKPOINT", STRINGIFY_BIGINT (checkpoint_number, uintbuf), 1); setenv ("TAR_BLOCKING_FACTOR", STRINGIFY_BIGINT (blocking_factor, uintbuf), 1); setenv ("TAR_SUBCOMMAND", subcommand_string (subcommand_option), 1); setenv ("TAR_FORMAT", archive_format_string (current_format == DEFAULT_FORMAT ? archive_format : current_format), 1); argv[0] = "/bin/sh"; argv[1] = "-c"; argv[2] = (char*) script_name; argv[3] = NULL; execv (argv[0], argv); exec_fatal (script_name); }
/* Propagate any failure of the grandchild back to the parent. */ void wait_for_grandchild (pid_t pid) { int wait_status; int exit_code = 0; while (waitpid (pid, &wait_status, 0) == -1) if (errno != EINTR) { waitpid_error (use_compress_program_option); break; } if (WIFSIGNALED (wait_status)) raise (WTERMSIG (wait_status)); else if (WEXITSTATUS (wait_status) != 0) exit_code = WEXITSTATUS (wait_status); exit (exit_code); }
int sys_exec_info_script (const char **archive_name, int volume_number) { pid_t pid; char *argv[4]; char uintbuf[UINTMAX_STRSIZE_BOUND]; int p[2]; static RETSIGTYPE (*saved_handler) (int sig); xpipe (p); saved_handler = signal (SIGPIPE, SIG_IGN); pid = xfork (); if (pid != 0) { /* Master */ int rc; int status; char *buf = NULL; size_t size = 0; FILE *fp; xclose (p[PWRITE]); fp = fdopen (p[PREAD], "r"); rc = getline (&buf, &size, fp); fclose (fp); if (rc > 0 && buf[rc-1] == '\n') buf[--rc] = 0; while (waitpid (pid, &status, 0) == -1) if (errno != EINTR) { signal (SIGPIPE, saved_handler); waitpid_error (info_script_option); return -1; } signal (SIGPIPE, saved_handler); if (WIFEXITED (status)) { if (WEXITSTATUS (status) == 0 && rc > 0) *archive_name = buf; else free (buf); return WEXITSTATUS (status); } free (buf); return -1; } /* Child */ setenv ("TAR_VERSION", PACKAGE_VERSION, 1); setenv ("TAR_ARCHIVE", *archive_name, 1); setenv ("TAR_VOLUME", STRINGIFY_BIGINT (volume_number, uintbuf), 1); setenv ("TAR_BLOCKING_FACTOR", STRINGIFY_BIGINT (blocking_factor, uintbuf), 1); setenv ("TAR_SUBCOMMAND", subcommand_string (subcommand_option), 1); setenv ("TAR_FORMAT", archive_format_string (current_format == DEFAULT_FORMAT ? archive_format : current_format), 1); setenv ("TAR_FD", STRINGIFY_BIGINT (p[PWRITE], uintbuf), 1); xclose (p[PREAD]); argv[0] = "/bin/sh"; argv[1] = "-c"; argv[2] = (char*) info_script_option; argv[3] = NULL; execv (argv[0], argv); exec_fatal (info_script_option); }
/* Set ARCHIVE for uncompressing, then reading an archive. */ pid_t sys_child_open_for_uncompress (void) { int parent_pipe[2]; int child_pipe[2]; pid_t grandchild_pid; pid_t child_pid; int wait_status; xpipe (parent_pipe); child_pid = xfork (); if (child_pid > 0) { /* The parent tar is still here! Just clean up. */ archive = parent_pipe[PREAD]; xclose (parent_pipe[PWRITE]); return child_pid; } /* The newborn child tar is here! */ program_name = _("tar (child)"); xdup2 (parent_pipe[PWRITE], STDOUT_FILENO); xclose (parent_pipe[PREAD]); /* Check if we need a grandchild tar. This happens only if either: a) we're reading stdin: to force unblocking; b) the file is to be accessed by rmt: compressor doesn't know how; c) the file is not a plain file. */ if (strcmp (archive_name_array[0], "-") != 0 && !_remdev (archive_name_array[0]) && is_regular_file (archive_name_array[0])) { /* We don't need a grandchild tar. Open the archive and lauch the uncompressor. */ archive = open (archive_name_array[0], O_RDONLY | O_BINARY, MODE_RW); if (archive < 0) open_fatal (archive_name_array[0]); xdup2 (archive, STDIN_FILENO); execlp (use_compress_program_option, use_compress_program_option, "-d", (char *) 0); exec_fatal (use_compress_program_option); } /* We do need a grandchild tar. */ xpipe (child_pipe); grandchild_pid = xfork (); if (grandchild_pid == 0) { /* The newborn grandchild tar is here! Launch the uncompressor. */ program_name = _("tar (grandchild)"); xdup2 (child_pipe[PREAD], STDIN_FILENO); xclose (child_pipe[PWRITE]); execlp (use_compress_program_option, use_compress_program_option, "-d", (char *) 0); exec_fatal (use_compress_program_option); } /* The child tar is still here! */ /* Prepare for unblocking the data from the archive into the uncompressor. */ xdup2 (child_pipe[PWRITE], STDOUT_FILENO); xclose (child_pipe[PREAD]); if (strcmp (archive_name_array[0], "-") == 0) archive = STDIN_FILENO; else archive = rmtopen (archive_name_array[0], O_RDONLY | O_BINARY, MODE_RW, rsh_command_option); if (archive < 0) open_fatal (archive_name_array[0]); /* Let's read the archive and pipe it into stdout. */ while (1) { char *cursor; size_t maximum; size_t count; size_t status; clear_read_error_count (); error_loop: status = rmtread (archive, record_start->buffer, record_size); if (status == SAFE_READ_ERROR) { archive_read_error (); goto error_loop; } if (status == 0) break; cursor = record_start->buffer; maximum = status; while (maximum) { count = maximum < BLOCKSIZE ? maximum : BLOCKSIZE; if (full_write (STDOUT_FILENO, cursor, count) != count) write_error (use_compress_program_option); cursor += count; maximum -= count; } } xclose (STDOUT_FILENO); /* Propagate any failure of the grandchild back to the parent. */ while (waitpid (grandchild_pid, &wait_status, 0) == -1) if (errno != EINTR) { waitpid_error (use_compress_program_option); break; } if (WIFSIGNALED (wait_status)) { kill (child_pid, WTERMSIG (wait_status)); exit_status = TAREXIT_FAILURE; } else if (WEXITSTATUS (wait_status) != 0) exit_status = WEXITSTATUS (wait_status); exit (exit_status); }
/* Set ARCHIVE for writing, then compressing an archive. */ pid_t sys_child_open_for_compress (void) { int parent_pipe[2]; int child_pipe[2]; pid_t grandchild_pid; pid_t child_pid; int wait_status; xpipe (parent_pipe); child_pid = xfork (); if (child_pid > 0) { /* The parent tar is still here! Just clean up. */ archive = parent_pipe[PWRITE]; xclose (parent_pipe[PREAD]); return child_pid; } /* The new born child tar is here! */ program_name = _("tar (child)"); xdup2 (parent_pipe[PREAD], STDIN_FILENO); xclose (parent_pipe[PWRITE]); /* Check if we need a grandchild tar. This happens only if either: a) the file is to be accessed by rmt: compressor doesn't know how; b) the file is not a plain file. */ if (!_remdev (archive_name_array[0]) && is_regular_file (archive_name_array[0])) { if (backup_option) maybe_backup_file (archive_name_array[0], 1); /* We don't need a grandchild tar. Open the archive and launch the compressor. */ if (strcmp (archive_name_array[0], "-")) { archive = creat (archive_name_array[0], MODE_RW); if (archive < 0) { int saved_errno = errno; if (backup_option) undo_last_backup (); errno = saved_errno; open_fatal (archive_name_array[0]); } xdup2 (archive, STDOUT_FILENO); } execlp (use_compress_program_option, use_compress_program_option, NULL); exec_fatal (use_compress_program_option); } /* We do need a grandchild tar. */ xpipe (child_pipe); grandchild_pid = xfork (); if (grandchild_pid == 0) { /* The newborn grandchild tar is here! Launch the compressor. */ program_name = _("tar (grandchild)"); xdup2 (child_pipe[PWRITE], STDOUT_FILENO); xclose (child_pipe[PREAD]); execlp (use_compress_program_option, use_compress_program_option, (char *) 0); exec_fatal (use_compress_program_option); } /* The child tar is still here! */ /* Prepare for reblocking the data from the compressor into the archive. */ xdup2 (child_pipe[PREAD], STDIN_FILENO); xclose (child_pipe[PWRITE]); if (strcmp (archive_name_array[0], "-") == 0) archive = STDOUT_FILENO; else { archive = rmtcreat (archive_name_array[0], MODE_RW, rsh_command_option); if (archive < 0) open_fatal (archive_name_array[0]); } /* Let's read out of the stdin pipe and write an archive. */ while (1) { size_t status = 0; char *cursor; size_t length; /* Assemble a record. */ for (length = 0, cursor = record_start->buffer; length < record_size; length += status, cursor += status) { size_t size = record_size - length; status = safe_read (STDIN_FILENO, cursor, size); if (status == SAFE_READ_ERROR) read_fatal (use_compress_program_option); if (status == 0) break; } /* Copy the record. */ if (status == 0) { /* We hit the end of the file. Write last record at full length, as the only role of the grandchild is doing proper reblocking. */ if (length > 0) { memset (record_start->buffer + length, 0, record_size - length); status = sys_write_archive_buffer (); if (status != record_size) archive_write_error (status); } /* There is nothing else to read, break out. */ break; } status = sys_write_archive_buffer (); if (status != record_size) archive_write_error (status); } /* Propagate any failure of the grandchild back to the parent. */ while (waitpid (grandchild_pid, &wait_status, 0) == -1) if (errno != EINTR) { waitpid_error (use_compress_program_option); break; } if (WIFSIGNALED (wait_status)) { kill (child_pid, WTERMSIG (wait_status)); exit_status = TAREXIT_FAILURE; } else if (WEXITSTATUS (wait_status) != 0) exit_status = WEXITSTATUS (wait_status); exit (exit_status); }