/* Command line parsing. Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001 Free Software Foundation, Inc. This file is part of GNU Wget. GNU Wget is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. GNU Wget 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 General Public License for more details. You should have received a copy of the GNU General Public License along with Wget; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #ifdef HAVE_UNISTD_H # include #endif /* HAVE_UNISTD_H */ #include #ifdef HAVE_STRING_H # include #else # include #endif /* HAVE_STRING_H */ #ifdef HAVE_SIGNAL_H # include #endif #ifdef HAVE_NLS #ifdef HAVE_LOCALE_H # include #endif /* HAVE_LOCALE_H */ #endif /* HAVE_NLS */ #include #define OPTIONS_DEFINED_HERE /* for options.h */ #include "wget.h" #include "utils.h" #include "init.h" #include "retr.h" #include "recur.h" #include "host.h" #include "cookies.h" #include "url.h" #include "progress.h" /* for progress_handle_sigwinch */ /* On GNU system this will include system-wide getopt.h. */ #include "getopt.h" #ifndef PATH_SEPARATOR # define PATH_SEPARATOR '/' #endif extern char *version_string; #ifndef errno extern int errno; #endif struct options opt; /* From log.c. */ void log_init PARAMS ((const char *, int)); void log_close PARAMS ((void)); void redirect_output PARAMS ((const char *)); static RETSIGTYPE redirect_output_signal PARAMS ((int)); const char *exec_name; /* Initialize I18N. The initialization amounts to invoking setlocale(), bindtextdomain() and textdomain(). Does nothing if NLS is disabled or missing. */ static void i18n_initialize (void) { /* If HAVE_NLS is defined, assume the existence of the three functions invoked here. */ #ifdef HAVE_NLS /* Set the current locale. */ /* Here we use LC_MESSAGES instead of LC_ALL, for two reasons. First, message catalogs are all of I18N Wget uses anyway. Second, setting LC_ALL has a dangerous potential of messing things up. For example, when in a foreign locale, Solaris strptime() fails to handle international dates correctly, which makes http_atotm() malfunction. */ #ifdef LC_MESSAGES setlocale (LC_MESSAGES, ""); setlocale (LC_CTYPE, ""); #else setlocale (LC_ALL, ""); #endif /* Set the text message domain. */ bindtextdomain ("wget", LOCALEDIR); textdomain ("wget"); #endif /* HAVE_NLS */ } /* Print the usage message. */ static void print_usage (void) { printf (_("Usage: %s [OPTION]... [URL]...\n"), exec_name); } /* Print the help message, describing all the available options. If you add an option, be sure to update this list. */ static void print_help (void) { printf (_("GNU Wget %s, a non-interactive network retriever.\n"), version_string); print_usage (); /* Had to split this in parts, so the #@@#%# Ultrix compiler and cpp don't bitch. Also, it makes translation much easier. */ fputs (_("\ \n\ Mandatory arguments to long options are mandatory for short options too.\n\ \n"), stdout); fputs (_("\ Startup:\n\ -V, --version display the version of Wget and exit.\n\ -h, --help print this help.\n\ -b, --background go to background after startup.\n\ -e, --execute=COMMAND execute a `.wgetrc\'-style command.\n\ \n"), stdout); fputs (_("\ Logging and input file:\n\ -o, --output-file=FILE log messages to FILE.\n\ -a, --append-output=FILE append messages to FILE.\n\ -d, --debug print debug output.\n\ -q, --quiet quiet (no output).\n\ -v, --verbose be verbose (this is the default).\n\ -nv, --non-verbose turn off verboseness, without being quiet.\n\ -i, --input-file=FILE download URLs found in FILE.\n\ -F, --force-html treat input file as HTML.\n\ -B, --base=URL prepends URL to relative links in -F -i file.\n\ --sslcertfile=FILE optional client certificate.\n\ --sslcertkey=KEYFILE optional keyfile for this certificate.\n\ --sslegdsock=FILE socket to the egd daemon(random data source).\n\ \n"), stdout); fputs (_("\ Download:\n\ --bind-address=ADDRESS bind to ADDRESS (hostname or IP) on local host.\n\ -t, --tries=NUMBER set number of retries to NUMBER (0 unlimits).\n\ -O --output-document=FILE write documents to FILE.\n\ -nc, --no-clobber don\'t clobber existing files or use .# suffixes.\n\ -c, --continue resume getting a partially-downloaded file.\n\ --progress=TYPE select progress gauge type.\n\ -N, --timestamping don\'t re-retrieve files unless newer than local.\n\ -S, --server-response print server response.\n\ --spider don\'t download anything.\n\ -T, --timeout=SECONDS set the read timeout to SECONDS.\n\ -w, --wait=SECONDS wait SECONDS between retrievals.\n\ --waitretry=SECONDS wait 1...SECONDS between retries of a retrieval.\n\ --random-wait wait from 0...2*WAIT secs between retrievals.\n\ -Y, --proxy=on/off turn proxy on or off.\n\ -Q, --quota=NUMBER set retrieval quota to NUMBER.\n\ --limit-rate=RATE limit download rate to RATE.\n\ \n"), stdout); fputs (_("\ Directories:\n\ -nd --no-directories don\'t create directories.\n\ -x, --force-directories force creation of directories.\n\ -nH, --no-host-directories don\'t create host directories.\n\ -P, --directory-prefix=PREFIX save files to PREFIX/...\n\ --cut-dirs=NUMBER ignore NUMBER remote directory components.\n\ \n"), stdout); fputs (_("\ HTTP options:\n\ --http-user=USER set http user to USER.\n\ --http-passwd=PASS set http password to PASS.\n\ -C, --cache=on/off (dis)allow server-cached data (normally allowed).\n\ -E, --html-extension save all text/html documents with .html extension.\n\ --ignore-length ignore `Content-Length\' header field.\n\ --header=STRING insert STRING among the headers.\n\ --proxy-user=USER set USER as proxy username.\n\ --proxy-passwd=PASS set PASS as proxy password.\n\ --referer=URL include `Referer: URL\' header in HTTP request.\n\ -s, --save-headers save the HTTP headers to file.\n\ -U, --user-agent=AGENT identify as AGENT instead of Wget/VERSION.\n\ --no-http-keep-alive disable HTTP keep-alive (persistent connections).\n\ --cookies=off don't use cookies.\n\ --load-cookies=FILE load cookies from FILE before session.\n\ --save-cookies=FILE save cookies to FILE after session.\n\ \n"), stdout); fputs (_("\ FTP options:\n\ -nr, --dont-remove-listing don\'t remove `.listing\' files.\n\ -g, --glob=on/off turn file name globbing on or off.\n\ --passive-ftp use the \"passive\" transfer mode.\n\ --retr-symlinks when recursing, get linked-to files (not dirs).\n\ \n"), stdout); fputs (_("\ Recursive retrieval:\n\ -r, --recursive recursive web-suck -- use with care!\n\ -l, --level=NUMBER maximum recursion depth (inf or 0 for infinite).\n\ --delete-after delete files locally after downloading them.\n\ -k, --convert-links convert non-relative links to relative.\n\ -K, --backup-converted before converting file X, back up as X.orig.\n\ -m, --mirror shortcut option equivalent to -r -N -l inf -nr.\n\ -p, --page-requisites get all images, etc. needed to display HTML page.\n\ \n"), stdout); fputs (_("\ Recursive accept/reject:\n\ -A, --accept=LIST comma-separated list of accepted extensions.\n\ -R, --reject=LIST comma-separated list of rejected extensions.\n\ -D, --domains=LIST comma-separated list of accepted domains.\n\ --exclude-domains=LIST comma-separated list of rejected domains.\n\ --follow-ftp follow FTP links from HTML documents.\n\ --follow-tags=LIST comma-separated list of followed HTML tags.\n\ -G, --ignore-tags=LIST comma-separated list of ignored HTML tags.\n\ -H, --span-hosts go to foreign hosts when recursive.\n\ -L, --relative follow relative links only.\n\ -I, --include-directories=LIST list of allowed directories.\n\ -X, --exclude-directories=LIST list of excluded directories.\n\ -nh, --no-host-lookup don\'t DNS-lookup hosts.\n\ -np, --no-parent don\'t ascend to the parent directory.\n\ \n"), stdout); fputs (_("Mail bug reports and suggestions to .\n"), stdout); } int main (int argc, char *const *argv) { char **url, **t; int i, c, nurl, status, append_to_log; static struct option long_options[] = { /* Options without arguments: */ { "background", no_argument, NULL, 'b' }, { "backup-converted", no_argument, NULL, 'K' }, { "continue", no_argument, NULL, 'c' }, { "convert-links", no_argument, NULL, 'k' }, { "debug", no_argument, NULL, 'd' }, { "delete-after", no_argument, NULL, 136 }, { "dont-remove-listing", no_argument, NULL, 149 }, { "follow-ftp", no_argument, NULL, 142 }, { "force-directories", no_argument, NULL, 'x' }, { "force-hier", no_argument, NULL, 'x' }, /* obsolete */ { "force-html", no_argument, NULL, 'F'}, { "help", no_argument, NULL, 'h' }, { "html-extension", no_argument, NULL, 'E' }, { "ignore-length", no_argument, NULL, 138 }, { "mirror", no_argument, NULL, 'm' }, { "no-clobber", no_argument, NULL, 141 }, { "no-directories", no_argument, NULL, 147 }, { "no-host-directories", no_argument, NULL, 148 }, { "no-host-lookup", no_argument, NULL, 150 }, { "no-http-keep-alive", no_argument, NULL, 156 }, { "no-parent", no_argument, NULL, 133 }, { "non-verbose", no_argument, NULL, 146 }, { "passive-ftp", no_argument, NULL, 139 }, { "page-requisites", no_argument, NULL, 'p' }, { "quiet", no_argument, NULL, 'q' }, { "random-wait", no_argument, NULL, 165 }, { "recursive", no_argument, NULL, 'r' }, { "relative", no_argument, NULL, 'L' }, { "retr-symlinks", no_argument, NULL, 137 }, { "save-headers", no_argument, NULL, 's' }, { "server-response", no_argument, NULL, 'S' }, { "span-hosts", no_argument, NULL, 'H' }, { "spider", no_argument, NULL, 132 }, { "timestamping", no_argument, NULL, 'N' }, { "verbose", no_argument, NULL, 'v' }, { "version", no_argument, NULL, 'V' }, /* Options accepting an argument: */ { "accept", required_argument, NULL, 'A' }, { "append-output", required_argument, NULL, 'a' }, { "backups", required_argument, NULL, 151 }, /* undocumented */ { "base", required_argument, NULL, 'B' }, { "bind-address", required_argument, NULL, 155 }, { "cache", required_argument, NULL, 'C' }, { "cookies", required_argument, NULL, 160 }, { "cut-dirs", required_argument, NULL, 145 }, { "directory-prefix", required_argument, NULL, 'P' }, { "domains", required_argument, NULL, 'D' }, { "dot-style", required_argument, NULL, 134 }, { "execute", required_argument, NULL, 'e' }, { "exclude-directories", required_argument, NULL, 'X' }, { "exclude-domains", required_argument, NULL, 140 }, { "follow-tags", required_argument, NULL, 153 }, { "glob", required_argument, NULL, 'g' }, { "header", required_argument, NULL, 131 }, { "htmlify", required_argument, NULL, 135 }, { "http-passwd", required_argument, NULL, 130 }, { "http-user", required_argument, NULL, 129 }, { "ignore-tags", required_argument, NULL, 'G' }, { "include-directories", required_argument, NULL, 'I' }, { "input-file", required_argument, NULL, 'i' }, { "level", required_argument, NULL, 'l' }, { "limit-rate", required_argument, NULL, 164 }, { "load-cookies", required_argument, NULL, 161 }, { "no", required_argument, NULL, 'n' }, { "output-document", required_argument, NULL, 'O' }, { "output-file", required_argument, NULL, 'o' }, { "progress", required_argument, NULL, 163 }, { "proxy", required_argument, NULL, 'Y' }, { "proxy-passwd", required_argument, NULL, 144 }, { "proxy-user", required_argument, NULL, 143 }, { "quota", required_argument, NULL, 'Q' }, { "reject", required_argument, NULL, 'R' }, { "save-cookies", required_argument, NULL, 162 }, { "timeout", required_argument, NULL, 'T' }, { "tries", required_argument, NULL, 't' }, { "user-agent", required_argument, NULL, 'U' }, { "referer", required_argument, NULL, 157 }, { "use-proxy", required_argument, NULL, 'Y' }, #ifdef HAVE_SSL { "sslcertfile", required_argument, NULL, 158 }, { "sslcertkey", required_argument, NULL, 159 }, { "sslegdsock", required_argument, NULL, 166 }, #endif /* HAVE_SSL */ { "wait", required_argument, NULL, 'w' }, { "waitretry", required_argument, NULL, 152 }, { 0, 0, 0, 0 } }; i18n_initialize (); append_to_log = 0; /* Construct the name of the executable, without the directory part. */ exec_name = strrchr (argv[0], PATH_SEPARATOR); if (!exec_name) exec_name = argv[0]; else ++exec_name; #ifdef WINDOWS windows_main_junk (&argc, (char **) argv, (char **) &exec_name); #endif initialize (); /* sets option defaults; reads the system wgetrc and .wgetrc */ /* [Is the order of the option letters significant? If not, they should be alphabetized, like the long_options. The only thing I know for sure is that the options with required arguments must be followed by a ':'. -- Dan Harkless ] */ while ((c = getopt_long (argc, argv, "\ hpVqvdkKsxmNWrHSLcFbEY:G:g:T:U:O:l:n:i:o:a:t:D:A:R:P:B:e:Q:X:I:w:C:", long_options, (int *)0)) != EOF) { switch (c) { /* Options without arguments: */ case 132: setval ("spider", "on"); break; case 133: setval ("noparent", "on"); break; case 136: setval ("deleteafter", "on"); break; case 137: setval ("retrsymlinks", "on"); break; case 138: setval ("ignorelength", "on"); break; case 139: setval ("passiveftp", "on"); break; case 141: setval ("noclobber", "on"); break; case 142: setval ("followftp", "on"); break; case 145: setval ("cutdirs", optarg); break; case 146: setval ("verbose", "off"); break; case 147: setval ("dirstruct", "off"); break; case 148: setval ("addhostdir", "off"); break; case 149: setval ("removelisting", "off"); break; case 155: setval ("bindaddress", optarg); break; case 156: setval ("httpkeepalive", "off"); break; case 165: setval ("randomwait", "on"); break; case 'b': setval ("background", "on"); break; case 'c': setval ("continue", "on"); break; case 'd': #ifdef DEBUG setval ("debug", "on"); #else /* not DEBUG */ fprintf (stderr, _("%s: debug support not compiled in.\n"), exec_name); #endif /* not DEBUG */ break; case 'E': setval ("htmlextension", "on"); break; case 'F': setval ("forcehtml", "on"); break; case 'H': setval ("spanhosts", "on"); break; case 'h': print_help (); #ifdef WINDOWS ws_help (exec_name); #endif exit (0); break; case 'K': setval ("backupconverted", "on"); break; case 'k': setval ("convertlinks", "on"); break; case 'L': setval ("relativeonly", "on"); break; case 'm': setval ("mirror", "on"); break; case 'N': setval ("timestamping", "on"); break; case 'p': setval ("pagerequisites", "on"); break; case 'S': setval ("serverresponse", "on"); break; case 's': setval ("saveheaders", "on"); break; case 'q': setval ("quiet", "on"); break; case 'r': setval ("recursive", "on"); break; case 'V': printf ("GNU Wget %s\n\n", version_string); printf ("%s", _("\ Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001 Free Software Foundation, Inc.\n")); printf ("%s", _("\ This program is distributed in the hope that it will be useful,\n\ but WITHOUT ANY WARRANTY; without even the implied warranty of\n\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n\ GNU General Public License for more details.\n")); printf (_("\nOriginally written by Hrvoje Niksic .\n")); exit (0); break; case 'v': setval ("verbose", "on"); break; case 'x': setval ("dirstruct", "on"); break; /* Options accepting an argument: */ case 129: setval ("httpuser", optarg); break; case 130: setval ("httppasswd", optarg); break; case 131: setval ("header", optarg); break; case 134: setval ("dotstyle", optarg); break; case 135: setval ("htmlify", optarg); break; case 140: setval ("excludedomains", optarg); break; case 143: setval ("proxyuser", optarg); break; case 144: setval ("proxypasswd", optarg); break; case 151: setval ("backups", optarg); break; case 152: setval ("waitretry", optarg); break; case 153: setval ("followtags", optarg); break; case 160: setval ("cookies", optarg); break; case 161: setval ("loadcookies", optarg); break; case 162: setval ("savecookies", optarg); break; case 163: setval ("progress", optarg); break; case 164: setval ("limitrate", optarg); break; case 157: setval ("referer", optarg); break; #ifdef HAVE_SSL case 158: setval ("sslcertfile", optarg); break; case 159: setval ("sslcertkey", optarg); break; case 166: setval ("sslegdsock", optarg); break; #endif /* HAVE_SSL */ case 'A': setval ("accept", optarg); break; case 'a': setval ("logfile", optarg); append_to_log = 1; break; case 'B': setval ("base", optarg); break; case 'C': setval ("cache", optarg); break; case 'D': setval ("domains", optarg); break; case 'e': { char *com, *val; if (parse_line (optarg, &com, &val)) { if (!setval (com, val)) exit (1); } else { fprintf (stderr, _("%s: %s: invalid command\n"), exec_name, optarg); exit (1); } xfree (com); xfree (val); } break; case 'G': setval ("ignoretags", optarg); break; case 'g': setval ("glob", optarg); break; case 'I': setval ("includedirectories", optarg); break; case 'i': setval ("input", optarg); break; case 'l': setval ("reclevel", optarg); break; case 'n': { /* #### What we really want here is --no-foo. */ char *p; for (p = optarg; *p; p++) switch (*p) { case 'v': setval ("verbose", "off"); break; case 'H': setval ("addhostdir", "off"); break; case 'd': setval ("dirstruct", "off"); break; case 'c': setval ("noclobber", "on"); break; case 'r': setval ("removelisting", "off"); break; case 'p': setval ("noparent", "on"); break; case 'k': setval ("httpkeepalive", "off"); break; default: printf (_("%s: illegal option -- `-n%c'\n"), exec_name, *p); print_usage (); printf ("\n"); printf (_("Try `%s --help\' for more options.\n"), exec_name); exit (1); } break; } case 'O': setval ("outputdocument", optarg); break; case 'o': setval ("logfile", optarg); break; case 'P': setval ("dirprefix", optarg); break; case 'Q': setval ("quota", optarg); break; case 'R': setval ("reject", optarg); break; case 'T': setval ("timeout", optarg); break; case 't': setval ("tries", optarg); break; case 'U': setval ("useragent", optarg); break; case 'w': setval ("wait", optarg); break; case 'X': setval ("excludedirectories", optarg); break; case 'Y': setval ("useproxy", optarg); break; case '?': print_usage (); printf ("\n"); printf (_("Try `%s --help' for more options.\n"), exec_name); exit (0); break; } } /* Initialize progress. Have to do this after the options are processed so we know where the log file is. */ if (opt.verbose) set_progress_implementation (opt.progress_type); /* All user options have now been processed, so it's now safe to do interoption dependency checks. */ if (opt.reclevel == 0) opt.reclevel = INFINITE_RECURSION; /* see wget.h for commentary on this */ if (opt.page_requisites && !opt.recursive) { opt.recursive = TRUE; opt.reclevel = 0; if (!opt.no_dirstruct) opt.dirstruct = TRUE; /* usually handled by cmd_spec_recursive() */ } if (opt.verbose == -1) opt.verbose = !opt.quiet; /* Sanity checks. */ if (opt.verbose && opt.quiet) { printf (_("Can't be verbose and quiet at the same time.\n")); print_usage (); exit (1); } if (opt.timestamping && opt.noclobber) { printf (_("\ Can't timestamp and not clobber old files at the same time.\n")); print_usage (); exit (1); } nurl = argc - optind; if (!nurl && !opt.input_filename) { /* No URL specified. */ printf (_("%s: missing URL\n"), exec_name); print_usage (); printf ("\n"); /* #### Something nicer should be printed here -- similar to the pre-1.5 `--help' page. */ printf (_("Try `%s --help' for more options.\n"), exec_name); exit (1); } if (opt.background) fork_to_background (); /* Allocate basic pointer. */ url = ALLOCA_ARRAY (char *, nurl + 1); /* Fill in the arguments. */ for (i = 0; i < nurl; i++, optind++) { char *rewritten = rewrite_shorthand_url (argv[optind]); if (rewritten) { printf ("Converted %s to %s\n", argv[optind], rewritten); url[i] = rewritten; } else url[i] = xstrdup (argv[optind]); } url[i] = NULL; /* Change the title of console window on Windows. #### I think this statement should belong to retrieve_url(). --hniksic. */ #ifdef WINDOWS ws_changetitle (*url, nurl); #endif /* Initialize logging. */ log_init (opt.lfilename, append_to_log); DEBUGP (("DEBUG output created by Wget %s on %s.\n\n", version_string, OS_TYPE)); /* Open the output filename if necessary. */ if (opt.output_document) { if (HYPHENP (opt.output_document)) opt.dfp = stdout; else { struct stat st; opt.dfp = fopen (opt.output_document, opt.always_rest ? "ab" : "wb"); if (opt.dfp == NULL) { perror (opt.output_document); exit (1); } if (fstat (fileno (opt.dfp), &st) == 0 && S_ISREG (st.st_mode)) opt.od_known_regular = 1; } } #ifdef WINDOWS ws_startup (); #endif /* Setup the signal handler to redirect output when hangup is received. */ #ifdef HAVE_SIGNAL if (signal(SIGHUP, SIG_IGN) != SIG_IGN) signal(SIGHUP, redirect_output_signal); /* ...and do the same for SIGUSR1. */ signal (SIGUSR1, redirect_output_signal); /* Writing to a closed socket normally signals SIGPIPE, and the process exits. What we want is to ignore SIGPIPE and just check for the return value of write(). */ signal (SIGPIPE, SIG_IGN); #ifdef SIGWINCH signal (SIGWINCH, progress_handle_sigwinch); #endif #endif /* HAVE_SIGNAL */ status = RETROK; /* initialize it, just-in-case */ /*recursive_reset ();*/ /* Retrieve the URLs from argument list. */ for (t = url; *t; t++) { char *filename = NULL, *redirected_URL = NULL; int dt; if (opt.recursive && url_scheme (*t) != SCHEME_FTP) status = retrieve_tree (*t); else status = retrieve_url (*t, &filename, &redirected_URL, NULL, &dt); if (opt.delete_after && file_exists_p(filename)) { DEBUGP (("Removing file due to --delete-after in main():\n")); logprintf (LOG_VERBOSE, _("Removing %s.\n"), filename); if (unlink (filename)) logprintf (LOG_NOTQUIET, "unlink: %s\n", strerror (errno)); } FREE_MAYBE (redirected_URL); FREE_MAYBE (filename); } /* And then from the input file, if any. */ if (opt.input_filename) { int count; status = retrieve_from_file (opt.input_filename, opt.force_html, &count); if (!count) logprintf (LOG_NOTQUIET, _("No URLs found in %s.\n"), opt.input_filename); } /* Print the downloaded sum. */ if (opt.recursive || nurl > 1 || (opt.input_filename && opt.downloaded != 0)) { logprintf (LOG_NOTQUIET, _("\nFINISHED --%s--\nDownloaded: %s bytes in %d files\n"), time_str (NULL), (opt.downloaded_overflow ? "" : legible_very_long (opt.downloaded)), opt.numurls); /* Print quota warning, if exceeded. */ if (downloaded_exceeds_quota ()) logprintf (LOG_NOTQUIET, _("Download quota (%s bytes) EXCEEDED!\n"), legible (opt.quota)); } if (opt.cookies_output) save_cookies (opt.cookies_output); if (opt.convert_links && !opt.delete_after) { convert_all_links (); } log_close (); for (i = 0; i < nurl; i++) xfree (url[i]); cleanup (); #ifdef DEBUG_MALLOC print_malloc_debug_stats (); #endif if (status == RETROK) return 0; else return 1; } #ifdef HAVE_SIGNAL /* Hangup signal handler. When wget receives SIGHUP or SIGUSR1, it will proceed operation as usual, trying to write into a log file. If that is impossible, the output will be turned off. */ static RETSIGTYPE redirect_output_signal (int sig) { char tmp[100]; signal (sig, redirect_output_signal); /* Please note that the double `%' in `%%s' is intentional, because redirect_output passes tmp through printf. */ sprintf (tmp, _("%s received, redirecting output to `%%s'.\n"), (sig == SIGHUP ? "SIGHUP" : (sig == SIGUSR1 ? "SIGUSR1" : "WTF?!"))); redirect_output (tmp); } #endif /* HAVE_SIGNAL */