From: Paul Eggert Date: Mon, 13 Dec 1999 02:51:14 +0000 (+0000) Subject: (xclose, xdup2, child_open_for_compress, child_open_for_uncompress, X-Git-Url: https://git.brokenzipper.com/gitweb?a=commitdiff_plain;h=196caec187f27a3c3e4a68eee6bb388d79dac960;p=chaz%2Ftar (xclose, xdup2, child_open_for_compress, child_open_for_uncompress, archive_write_error, archive_read_error, flush_archive, close_archive, init_volume_number, new_volume): Don't assume that gettext preserves errno. (xdup2): Don't report errno if dup returns an unexpected nonnegative value. (open_archive): Reject multivolume verify attempts a bit earlier. Rename local variable `access', in case it's defined by system header. (open_archive, backspace_output): Use `Cannot' uniformly, instead of `Could not' sometimes and `Cannot' others. (open_archive, flush_read, flush_archive, close_archive, new_volume): Quote arbitrary strings in diagnostics. (read_error): Set archive to STDOUT_FILENO temporarily when writing archive buffer. (init_volume_number): Check for input and output errors in volno_file. (new_volume): Use new fatal_exit function to exit, and new xfork function to fork. --- diff --git a/src/buffer.c b/src/buffer.c index 0172827..09738b3 100644 --- a/src/buffer.c +++ b/src/buffer.c @@ -39,12 +39,11 @@ time_t time (); #include #include +#include #include "common.h" #include "rmt.h" -#define DEBUG_FORK 0 /* if nonzero, childs are born stopped */ - #define PREAD 0 /* read file descriptor from pipe() */ #define PWRITE 1 /* write file descriptor from pipe() */ @@ -77,8 +76,8 @@ FILE *stdlis; static void backspace_output PARAMS ((void)); static int new_volume PARAMS ((enum access_mode)); -static void write_error PARAMS ((ssize_t)); -static void read_error PARAMS ((void)); +static void archive_write_error PARAMS ((ssize_t)); +static void archive_read_error PARAMS ((void)); #if !MSDOS /* Obnoxious test to see if dimwit is trying to dump the archive. */ @@ -134,22 +133,6 @@ static off_t real_s_sizeleft; /* Functions. */ -#if DEBUG_FORK - -static pid_t -myfork (void) -{ - pid_t result = fork (); - - if (result == 0) - kill (getpid (), SIGSTOP); - return result; -} - -# define fork myfork - -#endif /* DEBUG FORK */ - void print_total_written (void) { @@ -268,7 +251,10 @@ static void xclose (int fd) { if (close (fd) < 0) - FATAL_ERROR ((0, errno, _("Cannot close file #%d"), fd)); + { + int e = errno; + FATAL_ERROR ((0, e, _("Cannot close file #%d"), fd)); + } } /*-----------------------------------------------------------------------. @@ -283,11 +269,17 @@ xdup2 (int from, int into, const char *message) { int status = close (into); - if (status < 0 && errno != EBADF) - FATAL_ERROR ((0, errno, _("Cannot close descriptor %d"), into)); + if (status != 0 && errno != EBADF) + { + int e = errno; + FATAL_ERROR ((0, e, _("Cannot close file descriptor"))); + } status = dup (from); if (status != into) - FATAL_ERROR ((0, errno, _("Cannot properly duplicate %s"), message)); + { + int e = status < 0 ? errno : 0; + FATAL_ERROR ((0, e, _("Cannot properly duplicate %s"), message)); + } xclose (from); } } @@ -361,12 +353,8 @@ child_open_for_compress (void) int child_pipe[2]; pid_t grandchild_pid; - if (pipe (parent_pipe) < 0) - FATAL_ERROR ((0, errno, _("Cannot open pipe"))); - - child_pid = fork (); - if (child_pid < 0) - FATAL_ERROR ((0, errno, _("Cannot fork"))); + xpipe (parent_pipe); + child_pid = xfork (); if (child_pid > 0) { @@ -406,24 +394,19 @@ child_open_for_compress (void) if (backup_option) undo_last_backup (); - FATAL_ERROR ((0, saved_errno, _("Cannot open archive %s"), - archive_name_array[0])); + errno = saved_errno; + open_fatal (archive_name_array[0]); } xdup2 (archive, STDOUT_FILENO, _("Archive to stdout")); execlp (use_compress_program_option, use_compress_program_option, (char *) 0); - FATAL_ERROR ((0, errno, _("Cannot exec %s"), - use_compress_program_option)); + exec_fatal (use_compress_program_option); } /* We do need a grandchild tar. */ - if (pipe (child_pipe) < 0) - FATAL_ERROR ((0, errno, _("Cannot open pipe"))); - - grandchild_pid = fork (); - if (grandchild_pid < 0) - FATAL_ERROR ((0, errno, _("Child cannot fork"))); + xpipe (child_pipe); + grandchild_pid = xfork (); if (grandchild_pid > 0) { @@ -434,8 +417,7 @@ child_open_for_compress (void) xclose (child_pipe[PREAD]); execlp (use_compress_program_option, use_compress_program_option, (char *) 0); - FATAL_ERROR ((0, errno, _("Cannot exec %s"), - use_compress_program_option)); + exec_fatal (use_compress_program_option); } /* The new born grandchild tar is here! */ @@ -450,10 +432,11 @@ child_open_for_compress (void) 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) - FATAL_ERROR ((0, errno, _("Cannot open archive %s"), - archive_name_array[0])); + { + 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. */ @@ -479,7 +462,7 @@ child_open_for_compress (void) } if (status < 0) - FATAL_ERROR ((0, errno, _("Cannot read from compression program"))); + read_fatal (use_compress_program_option); /* Copy the record. */ @@ -494,7 +477,7 @@ child_open_for_compress (void) memset (record_start->buffer + length, 0, record_size - length); status = write_archive_buffer (); if (status != record_size) - write_error (status); + archive_write_error (status); } /* There is nothing else to read, break out. */ @@ -503,7 +486,7 @@ child_open_for_compress (void) status = write_archive_buffer (); if (status != record_size) - write_error (status); + archive_write_error (status); } #if 0 @@ -523,12 +506,8 @@ child_open_for_uncompress (void) int child_pipe[2]; pid_t grandchild_pid; - if (pipe (parent_pipe) < 0) - FATAL_ERROR ((0, errno, _("Cannot open pipe"))); - - child_pid = fork (); - if (child_pid < 0) - FATAL_ERROR ((0, errno, _("Cannot fork"))); + xpipe (parent_pipe); + child_pid = xfork (); if (child_pid > 0) { @@ -561,23 +540,17 @@ child_open_for_uncompress (void) archive = open (archive_name_array[0], O_RDONLY | O_BINARY, MODE_RW); if (archive < 0) - FATAL_ERROR ((0, errno, _("Cannot open archive %s"), - archive_name_array[0])); + open_fatal (archive_name_array[0]); xdup2 (archive, STDIN_FILENO, _("Archive to stdin")); execlp (use_compress_program_option, use_compress_program_option, "-d", (char *) 0); - FATAL_ERROR ((0, errno, _("Cannot exec %s"), - use_compress_program_option)); + exec_fatal (use_compress_program_option); } /* We do need a grandchild tar. */ - if (pipe (child_pipe) < 0) - FATAL_ERROR ((0, errno, _("Cannot open pipe"))); - - grandchild_pid = fork (); - if (grandchild_pid < 0) - FATAL_ERROR ((0, errno, _("Child cannot fork"))); + xpipe (child_pipe); + grandchild_pid = xfork (); if (grandchild_pid > 0) { @@ -587,8 +560,7 @@ child_open_for_uncompress (void) xclose (child_pipe[PWRITE]); execlp (use_compress_program_option, use_compress_program_option, "-d", (char *) 0); - FATAL_ERROR ((0, errno, _("Cannot exec %s"), - use_compress_program_option)); + exec_fatal (use_compress_program_option); } /* The new born grandchild tar is here! */ @@ -606,8 +578,7 @@ child_open_for_uncompress (void) archive = rmtopen (archive_name_array[0], O_RDONLY | O_BINARY, MODE_RW, rsh_command_option); if (archive < 0) - FATAL_ERROR ((0, errno, _("Cannot open archive %s"), - archive_name_array[0])); + open_fatal (archive_name_array[0]); /* Let's read the archive and pipe it into stdout. */ @@ -624,7 +595,7 @@ child_open_for_uncompress (void) status = rmtread (archive, record_start->buffer, record_size); if (status < 0) { - read_error (); + archive_read_error (); goto error_loop; } if (status == 0) @@ -636,7 +607,7 @@ child_open_for_uncompress (void) count = maximum < BLOCKSIZE ? maximum : BLOCKSIZE; status = full_write (STDOUT_FILENO, cursor, count); if (status < 0) - FATAL_ERROR ((0, errno, _("Cannot write to compression program"))); + write_error (use_compress_program_option); if (status != count) { @@ -691,7 +662,7 @@ check_label_pattern (union block *label) `------------------------------------------------------------------------*/ void -open_archive (enum access_mode access) +open_archive (enum access_mode wanted_access) { int backed_up_flag = 0; @@ -720,6 +691,8 @@ open_archive (enum access_mode access) if (multi_volume_option) { + if (verify_option) + FATAL_ERROR ((0, 0, _("Cannot verify multi-volume archives"))); record_start = valloc (record_size + (2 * BLOCKSIZE)); if (record_start) record_start += 2; @@ -727,16 +700,13 @@ open_archive (enum access_mode access) else record_start = valloc (record_size); if (!record_start) - FATAL_ERROR ((0, 0, _("Could not allocate memory for blocking factor %d"), + FATAL_ERROR ((0, 0, _("Cannot allocate memory for blocking factor %d"), blocking_factor)); current_block = record_start; record_end = record_start + blocking_factor; /* When updating the archive, we start with reading. */ - access_mode = access == ACCESS_UPDATE ? ACCESS_READ : access; - - if (multi_volume_option && verify_option) - FATAL_ERROR ((0, 0, _("Cannot verify multi-volume archives"))); + access_mode = wanted_access == ACCESS_UPDATE ? ACCESS_READ : wanted_access; if (use_compress_program_option) { @@ -745,7 +715,7 @@ open_archive (enum access_mode access) if (verify_option) FATAL_ERROR ((0, 0, _("Cannot verify compressed archives"))); - switch (access) + switch (wanted_access) { case ACCESS_READ: child_open_for_uncompress (); @@ -760,7 +730,8 @@ open_archive (enum access_mode access) break; } - if (access == ACCESS_WRITE && strcmp (archive_name_array[0], "-") == 0) + if (wanted_access == ACCESS_WRITE + && strcmp (archive_name_array[0], "-") == 0) stdlis = stderr; } else if (strcmp (archive_name_array[0], "-") == 0) @@ -769,7 +740,7 @@ open_archive (enum access_mode access) if (verify_option) FATAL_ERROR ((0, 0, _("Cannot verify stdin/stdout archive"))); - switch (access) + switch (wanted_access) { case ACCESS_READ: archive = STDIN_FILENO; @@ -791,7 +762,7 @@ open_archive (enum access_mode access) archive = rmtopen (archive_name_array[0], O_RDWR | O_CREAT | O_BINARY, MODE_RW, rsh_command_option); else - switch (access) + switch (wanted_access) { case ACCESS_READ: archive = rmtopen (archive_name_array[0], O_RDONLY | O_BINARY, @@ -821,7 +792,8 @@ open_archive (enum access_mode access) if (backed_up_flag) undo_last_backup (); - FATAL_ERROR ((0, saved_errno, "%s", archive_name_array[0])); + errno = saved_errno; + open_fatal (archive_name_array[0]); } #if !MSDOS @@ -854,7 +826,7 @@ open_archive (enum access_mode access) setmode (archive, O_BINARY); #endif - switch (access) + switch (wanted_access) { case ACCESS_READ: case ACCESS_UPDATE: @@ -866,11 +838,12 @@ open_archive (enum access_mode access) union block *label = find_next_block (); if (!label) - FATAL_ERROR ((0, 0, _("Archive not labeled to match `%s'"), - volume_label_option)); + FATAL_ERROR ((0, 0, _("Archive not labeled to match %s"), + quote (volume_label_option))); if (!check_label_pattern (label)) - FATAL_ERROR ((0, 0, _("Volume `%s' does not match `%s'"), - label->header.name, volume_label_option)); + FATAL_ERROR ((0, 0, _("Volume %s does not match %s"), + quote_n (0, label->header.name), + quote_n (1, volume_label_option))); } break; @@ -920,7 +893,7 @@ flush_write (void) else status = write_archive_buffer (); if (status != record_size && !multi_volume_option) - write_error (status); + archive_write_error (status); if (status > 0) bytes_written += status; @@ -954,7 +927,7 @@ flush_write (void) /* ENXIO is for the UNIX PC. */ if (status < 0 && errno != ENOSPC && errno != EIO && errno != ENXIO) - write_error (status); + archive_write_error (status); /* If error indicates a short write, we just move to the next tape. */ @@ -981,7 +954,8 @@ flush_write (void) if (volume_label_option) { memset (record_start, 0, BLOCKSIZE); - sprintf (record_start->header.name, "%s Volume %d", volume_label_option, volno); + sprintf (record_start->header.name, "%s Volume %d", + volume_label_option, volno); TIME_TO_CHARS (start_time, record_start->header.mtime); record_start->header.typeflag = GNUTYPE_VOLHDR; finish_header (record_start); @@ -1016,7 +990,7 @@ flush_write (void) status = write_archive_buffer (); if (status != record_size) - write_error (status); + archive_write_error (status); bytes_written += status; @@ -1054,7 +1028,7 @@ flush_write (void) `---------------------------------------------------------------------*/ static void -write_error (ssize_t status) +archive_write_error (ssize_t status) { int saved_errno = errno; @@ -1064,12 +1038,14 @@ write_error (ssize_t status) print_total_written (); if (status < 0) - FATAL_ERROR ((0, saved_errno, _("Cannot write to %s"), - *archive_name_cursor)); + { + errno = saved_errno; + write_fatal (*archive_name_cursor); + } else FATAL_ERROR ((0, 0, _("Only wrote %lu of %lu bytes to %s"), (unsigned long) status, (unsigned long) record_size, - *archive_name_cursor)); + quote (*archive_name_cursor))); } /*-------------------------------------------------------------------. @@ -1078,9 +1054,9 @@ write_error (ssize_t status) `-------------------------------------------------------------------*/ static void -read_error (void) +archive_read_error (void) { - ERROR ((0, errno, _("Read error on %s"), *archive_name_cursor)); + read_error (*archive_name_cursor); if (record_start_block == 0) FATAL_ERROR ((0, 0, _("At beginning of tape, quitting now"))); @@ -1114,9 +1090,11 @@ flush_read (void) if (write_archive_to_stdout && record_start_block != 0) { + archive = STDOUT_FILENO; status = write_archive_buffer (); + archive = STDIN_FILENO; if (status != record_size) - write_error (status); + archive_write_error (status); } if (multi_volume_option) { @@ -1171,7 +1149,7 @@ flush_read (void) status = rmtread (archive, record_start->buffer, record_size); if (status < 0) { - read_error (); + archive_read_error (); goto vol_error; } if (status != record_size) @@ -1185,15 +1163,16 @@ flush_read (void) { if (!check_label_pattern (cursor)) { - WARN ((0, 0, _("Volume `%s' does not match `%s'"), - cursor->header.name, volume_label_option)); + WARN ((0, 0, _("Volume %s does not match %s"), + quote_n (0, cursor->header.name), + quote_n (1, volume_label_option))); volno--; global_volno--; goto try_volume; } } if (verbose_option) - fprintf (stdlis, _("Reading %s\n"), cursor->header.name); + fprintf (stdlis, _("Reading %s\n"), quote (cursor->header.name)); cursor++; } else if (volume_label_option) @@ -1206,7 +1185,7 @@ flush_read (void) || strcmp (cursor->header.name, real_s_name)) { WARN ((0, 0, _("%s is not continued on this volume"), - real_s_name)); + quote (real_s_name))); volno--; global_volno--; goto try_volume; @@ -1220,7 +1199,7 @@ flush_read (void) char s2buf[UINTMAX_STRSIZE_BOUND]; WARN ((0, 0, _("%s is the wrong size (%s != %s + %s)"), - cursor->header.name, + quote (cursor->header.name), STRINGIFY_BIGINT (save_totsize, totsizebuf), STRINGIFY_BIGINT (s1, s1buf), STRINGIFY_BIGINT (s2, s2buf))); @@ -1243,7 +1222,7 @@ flush_read (void) } else if (status < 0) { - read_error (); + archive_read_error (); goto error_loop; /* try again */ } @@ -1254,7 +1233,7 @@ flush_read (void) while (left % BLOCKSIZE != 0) { while ((status = rmtread (archive, more, left)) < 0) - read_error (); + archive_read_error (); if (status == 0) { @@ -1305,8 +1284,11 @@ flush_archive (void) int status = rmtclose (archive); if (status < 0) - WARN ((0, errno, _("WARNING: Cannot close %s (%d, %d)"), - *archive_name_cursor, archive, status)); + { + int e = errno; + WARN ((0, e, _("WARNING: %s: close (%d, %d)"), + quotearg_colon (*archive_name_cursor), archive, status)); + } archive = file_to_switch_to; } @@ -1362,7 +1344,7 @@ backspace_output (void) /* Lseek failed. Try a different method. */ WARN ((0, 0, - _("Could not backspace archive file; it may be unreadable without -i"))); + _("Cannot backspace archive file; it may be unreadable without -i"))); /* Replace the first part of the record with NULs. */ @@ -1406,8 +1388,7 @@ close_archive (void) int status = pos < 0 ? -1 : ftruncate (archive, pos); #endif if (status != 0) - WARN ((0, errno, _("WARNING: Cannot truncate %s"), - *archive_name_cursor)); + truncate_warn (*archive_name_cursor); } if (verify_option) verify_volume (); @@ -1416,8 +1397,11 @@ close_archive (void) int status = rmtclose (archive); if (status < 0) - WARN ((0, errno, _("WARNING: Cannot close %s (%d, %d)"), - *archive_name_cursor, archive, status)); + { + int e = errno; + WARN ((0, e, _("WARNING: %s: close (%d, %d)"), + quotearg_colon (*archive_name_cursor), archive, status)); + } } #if !MSDOS @@ -1429,7 +1413,7 @@ close_archive (void) while (waitpid (child_pid, &wait_status, 0) == -1) if (errno != EINTR) { - ERROR ((0, errno, _("While waiting for child"))); + waitpid_error (use_compress_program_option); break; } @@ -1475,11 +1459,13 @@ init_volume_number (void) if (file) { fscanf (file, "%d", &global_volno); - if (fclose (file) == EOF) - ERROR ((0, errno, "%s", volno_file_option)); + if (ferror (file)) + read_error (volno_file_option); + if (fclose (file) != 0) + close_error (volno_file_option); } else if (errno != ENOENT) - ERROR ((0, errno, "%s", volno_file_option)); + open_error (volno_file_option); } /*-------------------------------------------------------. @@ -1494,11 +1480,13 @@ closeout_volume_number (void) if (file) { fprintf (file, "%d\n", global_volno); - if (fclose (file) == EOF) - ERROR ((0, errno, "%s", volno_file_option)); + if (ferror (file)) + write_error (volno_file_option); + if (fclose (file) != 0) + close_error (volno_file_option); } else - ERROR ((0, errno, "%s", volno_file_option)); + open_error (volno_file_option); } /*-----------------------------------------------------------------------. @@ -1524,8 +1512,11 @@ new_volume (enum access_mode access) verify_volume (); if (status = rmtclose (archive), status < 0) - WARN ((0, errno, _("WARNING: Cannot close %s (%d, %d)"), - *archive_name_cursor, archive, status)); + { + int e = errno; + WARN ((0, e, _("WARNING: %s: close (%d, %d)"), + quotearg_colon (*archive_name_cursor), archive, status)); + } global_volno++; volno++; @@ -1555,7 +1546,7 @@ new_volume (enum access_mode access) fputc ('\007', stderr); fprintf (stderr, _("Prepare volume #%d for %s and hit return: "), - global_volno, *archive_name_cursor); + global_volno, quote (*archive_name_cursor)); fflush (stderr); if (fgets (input_buffer, sizeof input_buffer, read_file) == 0) @@ -1567,8 +1558,7 @@ new_volume (enum access_mode access) && subcommand_option != DIFF_SUBCOMMAND) WARN ((0, 0, _("WARNING: Archive is incomplete"))); - apply_delayed_set_stat (); - exit (TAREXIT_FAILURE); + fatal_exit (); } if (input_buffer[0] == '\n' || input_buffer[0] == 'y' @@ -1597,8 +1587,7 @@ new_volume (enum access_mode access) && subcommand_option != DIFF_SUBCOMMAND) WARN ((0, 0, _("WARNING: Archive is incomplete"))); - apply_delayed_set_stat (); - exit (TAREXIT_FAILURE); + fatal_exit (); case 'n': /* Get new file name. */ @@ -1624,36 +1613,25 @@ new_volume (enum access_mode access) spawnl (P_WAIT, getenv ("COMSPEC"), "-", 0); #else /* not MSDOS */ { - pid_t child = fork (); - switch (child) + pid_t child; + const char *shell = getenv ("SHELL"); + if (! shell) + shell = "/bin/sh"; + child = xfork (); + if (child == 0) + { + execlp (shell, "-sh", "-i", 0); + exec_fatal (shell); + } + else { - case -1: - WARN ((0, errno, _("Cannot fork!"))); - break; - - case 0: - { - const char *shell = getenv ("SHELL"); - - if (! shell) - shell = "/bin/sh"; - execlp (shell, "-sh", "-i", 0); - FATAL_ERROR ((0, errno, _("Cannot exec a shell %s"), - shell)); - } - - default: - { - int wait_status; - while (waitpid (child, &wait_status, 0) == -1) - if (errno != EINTR) - { - ERROR ((0, errno, - _("While waiting for child"))); - break; - } - } - break; + int wait_status; + while (waitpid (child, &wait_status, 0) == -1) + if (errno != EINTR) + { + waitpid_error (shell); + break; + } } } #endif /* not MSDOS */ @@ -1688,7 +1666,7 @@ new_volume (enum access_mode access) if (archive < 0) { - WARN ((0, errno, _("Cannot open %s"), *archive_name_cursor)); + open_warn (*archive_name_cursor); if (!verify_option && access == ACCESS_WRITE && backup_option) undo_last_backup (); goto tryagain;