| 1 |
/* |
| 2 |
* Copyright 2001 by Marco d'Itri <md@linux.it> |
| 3 |
* |
| 4 |
* Original version by Mike Baker, then maintained by pcg@goof.com. |
| 5 |
* |
| 6 |
* This program is free software; you can redistribute it and/or modify |
| 7 |
* it under the terms of the GNU General Public License as published by |
| 8 |
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
* (at your option) any later version. |
| 10 |
* |
| 11 |
* This program is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* You should have received a copy of the GNU General Public License |
| 17 |
* along with this program; if not, write to the Free Software |
| 18 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
| 19 |
*/ |
| 20 |
|
| 21 |
#include "config.h" |
| 22 |
#include <stdlib.h> |
| 23 |
#include <stdio.h> |
| 24 |
#include <unistd.h> |
| 25 |
#include <string.h> |
| 26 |
#include <signal.h> |
| 27 |
#include <time.h> |
| 28 |
#include <fcntl.h> |
| 29 |
#include <errno.h> |
| 30 |
#include <sys/time.h> |
| 31 |
#include <sys/stat.h> |
| 32 |
#include <sys/types.h> |
| 33 |
#if HAS_REGEX |
| 34 |
#include <regex.h> |
| 35 |
#endif |
| 36 |
#include <X11/Xlib.h> |
| 37 |
#include <X11/Xutil.h> |
| 38 |
|
| 39 |
/* data structures */ |
| 40 |
struct logfile_entry { |
| 41 |
char *fname; /* name of file */ |
| 42 |
char *desc; /* alternative description */ |
| 43 |
FILE *fp; /* FILE struct associated with file */ |
| 44 |
ino_t inode; /* inode of the file opened */ |
| 45 |
off_t last_size; /* file size at the last check */ |
| 46 |
unsigned long color; /* color to be used for printing */ |
| 47 |
struct logfile_entry *next; |
| 48 |
}; |
| 49 |
|
| 50 |
struct linematrix { |
| 51 |
char *line; |
| 52 |
unsigned long color; |
| 53 |
}; |
| 54 |
|
| 55 |
|
| 56 |
/* global variables */ |
| 57 |
int width = STD_WIDTH, listlen = STD_HEIGHT; |
| 58 |
int win_x = LOC_X, win_y = LOC_Y; |
| 59 |
int w = -1, h = -1, font_width, font_height, font_descent; |
| 60 |
int do_reopen; |
| 61 |
struct timeval interval = { 2, 400000 }; /* see Knuth */ |
| 62 |
|
| 63 |
/* command line options */ |
| 64 |
int opt_noinitial, opt_shade, opt_frame, opt_reverse, opt_nofilename, |
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geom_mask, reload = 3600; |
| 66 |
const char *command = NULL, |
| 67 |
*fontname = USE_FONT, *dispname = NULL, *def_color = DEF_COLOR; |
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|
| 69 |
struct logfile_entry *loglist = NULL, *loglist_tail = NULL; |
| 70 |
|
| 71 |
Display *disp; |
| 72 |
Window root; |
| 73 |
GC WinGC; |
| 74 |
|
| 75 |
#if HAS_REGEX |
| 76 |
struct re_list { |
| 77 |
regex_t from; |
| 78 |
const char *to; |
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struct re_list *next; |
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}; |
| 81 |
struct re_list *re_head, *re_tail; |
| 82 |
#endif |
| 83 |
|
| 84 |
|
| 85 |
/* prototypes */ |
| 86 |
void list_files(int); |
| 87 |
void force_reopen(int); |
| 88 |
void force_refresh(int); |
| 89 |
void blank_window(int); |
| 90 |
|
| 91 |
void InitWindow(void); |
| 92 |
unsigned long GetColor(const char *); |
| 93 |
void redraw(void); |
| 94 |
void refresh(struct linematrix *, int, int); |
| 95 |
|
| 96 |
void transform_line(char *s); |
| 97 |
int lineinput(char *, int, FILE *); |
| 98 |
void reopen(void); |
| 99 |
void check_open_files(void); |
| 100 |
FILE *openlog(struct logfile_entry *); |
| 101 |
void main_loop(void); |
| 102 |
|
| 103 |
void display_version(void); |
| 104 |
void display_help(char *); |
| 105 |
void install_signal(int, void (*)(int)); |
| 106 |
void *xstrdup(const char *); |
| 107 |
void *xmalloc(size_t); |
| 108 |
int daemonize(void); |
| 109 |
|
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/* signal handlers */ |
| 111 |
void list_files(int dummy) |
| 112 |
{ |
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struct logfile_entry *e; |
| 114 |
|
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fprintf(stderr, "Files opened:\n"); |
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for (e = loglist; e; e = e->next) |
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fprintf(stderr, "\t%s (%s)\n", e->fname, e->desc); |
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} |
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|
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void force_reopen(int dummy) |
| 121 |
{ |
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do_reopen = 1; |
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} |
| 124 |
|
| 125 |
void force_refresh(int dummy) |
| 126 |
{ |
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XClearWindow(disp, root); |
| 128 |
redraw(); |
| 129 |
} |
| 130 |
|
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void blank_window(int dummy) |
| 132 |
{ |
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XClearWindow(disp, root); |
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XFlush(disp); |
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exit(0); |
| 136 |
} |
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|
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/* X related functions */ |
| 139 |
unsigned long GetColor(const char *ColorName) |
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{ |
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XColor Color; |
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XWindowAttributes Attributes; |
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|
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XGetWindowAttributes(disp, root, &Attributes); |
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Color.pixel = 0; |
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if (!XParseColor(disp, Attributes.colormap, ColorName, &Color)) |
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fprintf(stderr, "can't parse %s\n", ColorName); |
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else if (!XAllocColor(disp, Attributes.colormap, &Color)) |
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fprintf(stderr, "can't allocate %s\n", ColorName); |
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return Color.pixel; |
| 151 |
} |
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|
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void InitWindow(void) |
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{ |
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XGCValues gcv; |
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Font font; |
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unsigned long gcm; |
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XFontStruct *info; |
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int screen, ScreenWidth, ScreenHeight; |
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|
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if (!(disp = XOpenDisplay(dispname))) { |
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fprintf(stderr, "Can't open display %s.\n", dispname); |
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exit(1); |
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} |
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screen = DefaultScreen(disp); |
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ScreenHeight = DisplayHeight(disp, screen); |
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ScreenWidth = DisplayWidth(disp, screen); |
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root = RootWindow(disp, screen); |
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gcm = GCBackground; |
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gcv.graphics_exposures = True; |
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WinGC = XCreateGC(disp, root, gcm, &gcv); |
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XMapWindow(disp, root); |
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XSetForeground(disp, WinGC, GetColor(DEF_COLOR)); |
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|
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font = XLoadFont(disp, fontname); |
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XSetFont(disp, WinGC, font); |
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info = XQueryFont(disp, font); |
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font_width = info->max_bounds.width; |
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font_descent = info->max_bounds.descent; |
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font_height = info->max_bounds.ascent + font_descent; |
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|
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w = width * font_width; |
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h = listlen * font_height; |
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if (geom_mask & XNegative) |
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win_x = win_x + ScreenWidth - w; |
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if (geom_mask & YNegative) |
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win_y = win_y + ScreenHeight - h; |
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|
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XSelectInput(disp, root, ExposureMask|FocusChangeMask); |
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} |
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|
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char * |
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detabificate (char *s) |
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{ |
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char * out; |
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int i, j; |
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|
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out = malloc (8 * strlen (s) + 1); |
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|
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for(i = 0, j = 0; s[i]; i++) |
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{ |
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if (s[i] == '\t') |
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do |
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out[j++] = ' '; |
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while (j % 8); |
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else |
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out[j++] = s[i]; |
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} |
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|
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out[j] = '\0'; |
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return out; |
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} |
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|
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/* |
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* redraw does a complete redraw, rather than an update (i.e. the area |
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* gets cleared first) |
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* the rest is handled by regular refresh()'es |
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*/ |
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void redraw(void) |
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{ |
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XClearArea(disp, root, win_x, win_y, w, h + font_descent + 2, True); |
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} |
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|
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/* Just redraw everything without clearing (i.e. after an EXPOSE event) */ |
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void refresh(struct linematrix *lines, int miny, int maxy) |
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{ |
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int lin; |
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int offset = (listlen + 1) * font_height; |
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unsigned long black_color = GetColor("black"); |
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|
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miny -= win_y + font_height; |
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maxy -= win_y - font_height; |
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|
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for (lin = listlen; lin--;) |
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{ |
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char *temp; |
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|
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offset -= font_height; |
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|
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if (offset < miny || offset > maxy) |
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continue; |
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|
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#define LIN ((opt_reverse)?(listlen-lin-1):(lin)) |
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temp = detabificate (lines[LIN].line); |
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|
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if (opt_shade) |
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{ |
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XSetForeground (disp, WinGC, black_color); |
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XDrawString (disp, root, WinGC, win_x + 2, win_y + offset + 2, |
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temp, strlen (temp)); |
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} |
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|
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XSetForeground (disp, WinGC, lines[LIN].color); |
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XDrawString (disp, root, WinGC, win_x, win_y + offset, |
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temp, strlen (temp)); |
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|
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free (temp); |
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} |
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|
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if (opt_frame) { |
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int bot_y = win_y + h + font_descent + 2; |
| 262 |
|
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XDrawLine(disp, root, WinGC, win_x, win_y, win_x + w, win_y); |
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XDrawLine(disp, root, WinGC, win_x + w, win_y, win_x + w, bot_y); |
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XDrawLine(disp, root, WinGC, win_x + w, bot_y, win_x, bot_y); |
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XDrawLine(disp, root, WinGC, win_x, bot_y, win_x, win_y); |
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} |
| 268 |
} |
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|
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#if HAS_REGEX |
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void transform_line(char *s) |
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{ |
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#ifdef I_AM_Md |
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int i; |
| 275 |
if (1) { |
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for (i = 16; s[i]; i++) |
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s[i] = s[i + 11]; |
| 278 |
} |
| 279 |
s[i + 1] = '\0'; |
| 280 |
#endif |
| 281 |
|
| 282 |
if (transformre) { |
| 283 |
int i; |
| 284 |
regmatch_t matched[16]; |
| 285 |
|
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i = regexec(&transformre, string, 16, matched, 0); |
| 287 |
if (i == 0) { /* matched */ |
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} |
| 289 |
} |
| 290 |
} |
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#endif |
| 292 |
|
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|
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/* |
| 295 |
* This routine should read 'width' characters and not more. However, |
| 296 |
* we really want to read width + 1 charachters if the last char is a '\n', |
| 297 |
* which we should remove afterwards. So, read width+1 chars and ungetc |
| 298 |
* the last character if it's not a newline. This means 'string' must be |
| 299 |
* width + 2 wide! |
| 300 |
*/ |
| 301 |
int lineinput(char *string, int slen, FILE *f) |
| 302 |
{ |
| 303 |
int len; |
| 304 |
|
| 305 |
do { |
| 306 |
if (fgets(string, slen, f) == NULL) /* EOF or Error */ |
| 307 |
return 0; |
| 308 |
|
| 309 |
len = strlen(string); |
| 310 |
} while (len == 0); |
| 311 |
|
| 312 |
if (string[len - 1] == '\n') |
| 313 |
string[len - 1] = '\0'; /* erase newline */ |
| 314 |
else if (len >= slen - 1) { |
| 315 |
ungetc(string[len - 1], f); |
| 316 |
string[len - 1] = '\0'; |
| 317 |
} |
| 318 |
|
| 319 |
#if HAS_REGEX |
| 320 |
transform_line(string); |
| 321 |
#endif |
| 322 |
return len; |
| 323 |
} |
| 324 |
|
| 325 |
/* input: reads file->fname |
| 326 |
* output: fills file->fp, file->inode |
| 327 |
* returns file->fp |
| 328 |
* in case of error, file->fp is NULL |
| 329 |
*/ |
| 330 |
FILE *openlog(struct logfile_entry *file) |
| 331 |
{ |
| 332 |
struct stat stats; |
| 333 |
|
| 334 |
if ((file->fp = fopen(file->fname, "r")) == NULL) { |
| 335 |
file->fp = NULL; |
| 336 |
return NULL; |
| 337 |
} |
| 338 |
|
| 339 |
fstat(fileno(file->fp), &stats); |
| 340 |
if (S_ISFIFO(stats.st_mode)) { |
| 341 |
if (fcntl(fileno(file->fp), F_SETFL, O_NONBLOCK) < 0) |
| 342 |
perror("fcntl"), exit(1); |
| 343 |
file->inode = 0; |
| 344 |
} else |
| 345 |
file->inode = stats.st_ino; |
| 346 |
|
| 347 |
if (opt_noinitial) |
| 348 |
fseek (file->fp, 0, SEEK_END); |
| 349 |
else if (stats.st_size > (listlen + 1) * width) |
| 350 |
{ |
| 351 |
char dummy[255]; |
| 352 |
|
| 353 |
fseek(file->fp, -((listlen + 2) * width), SEEK_END); |
| 354 |
/* the pointer might point halfway some line. Let's |
| 355 |
be nice and skip this damaged line */ |
| 356 |
lineinput(dummy, sizeof(dummy), file->fp); |
| 357 |
} |
| 358 |
|
| 359 |
file->last_size = stats.st_size; |
| 360 |
return file->fp; |
| 361 |
} |
| 362 |
|
| 363 |
void reopen(void) |
| 364 |
{ |
| 365 |
struct logfile_entry *e; |
| 366 |
|
| 367 |
for (e = loglist; e; e = e->next) { |
| 368 |
if (!e->inode) |
| 369 |
continue; /* skip stdin */ |
| 370 |
|
| 371 |
if (e->fp) |
| 372 |
fclose(e->fp); |
| 373 |
/* if fp is NULL we will try again later */ |
| 374 |
openlog(e); |
| 375 |
} |
| 376 |
|
| 377 |
do_reopen = 0; |
| 378 |
} |
| 379 |
|
| 380 |
void check_open_files(void) |
| 381 |
{ |
| 382 |
struct logfile_entry *e; |
| 383 |
struct stat stats; |
| 384 |
|
| 385 |
for (e = loglist; e; e = e->next) { |
| 386 |
if (!e->inode) |
| 387 |
continue; /* skip stdin */ |
| 388 |
|
| 389 |
if (stat(e->fname, &stats) < 0) { /* file missing? */ |
| 390 |
sleep(1); |
| 391 |
if (e->fp) |
| 392 |
fclose(e->fp); |
| 393 |
if (openlog(e) == NULL) |
| 394 |
break; |
| 395 |
} |
| 396 |
|
| 397 |
if (stats.st_ino != e->inode) { /* file renamed? */ |
| 398 |
if (e->fp) |
| 399 |
fclose(e->fp); |
| 400 |
if (openlog(e) == NULL) |
| 401 |
break; |
| 402 |
} |
| 403 |
|
| 404 |
if (stats.st_size < e->last_size) { /* file truncated? */ |
| 405 |
fseek(e->fp, 0, SEEK_SET); |
| 406 |
e->last_size = stats.st_size; |
| 407 |
} |
| 408 |
} |
| 409 |
} |
| 410 |
|
| 411 |
#define SCROLL_UP(lines, listlen) \ |
| 412 |
{ \ |
| 413 |
int cur_line; \ |
| 414 |
for (cur_line = 0; cur_line < (listlen - 1); cur_line++) { \ |
| 415 |
strcpy(lines[cur_line].line, lines[cur_line + 1].line); \ |
| 416 |
lines[cur_line].color = lines[cur_line + 1].color; \ |
| 417 |
} \ |
| 418 |
} |
| 419 |
|
| 420 |
void main_loop(void) |
| 421 |
{ |
| 422 |
struct linematrix *lines = xmalloc(sizeof(struct linematrix) * listlen); |
| 423 |
int lin, miny, maxy, buflen; |
| 424 |
char *buf; |
| 425 |
time_t lastreload; |
| 426 |
Region region = XCreateRegion(); |
| 427 |
XEvent xev; |
| 428 |
|
| 429 |
maxy = 0; |
| 430 |
miny = win_y + h; |
| 431 |
buflen = width + 2; |
| 432 |
buf = xmalloc(buflen); |
| 433 |
lastreload = time(NULL); |
| 434 |
|
| 435 |
/* Initialize linematrix */ |
| 436 |
for (lin = 0; lin < listlen; lin++) { |
| 437 |
lines[lin].line = xmalloc(buflen); |
| 438 |
strcpy(lines[lin].line, "~"); |
| 439 |
lines[lin].color = GetColor(def_color); |
| 440 |
} |
| 441 |
|
| 442 |
if (!opt_noinitial) |
| 443 |
while (lineinput(buf, buflen, loglist->fp) != 0) { |
| 444 |
SCROLL_UP(lines, listlen); |
| 445 |
/* print the next line */ |
| 446 |
strcpy(lines[listlen - 1].line, buf); |
| 447 |
} |
| 448 |
|
| 449 |
for (;;) { |
| 450 |
int need_update = 0; |
| 451 |
struct logfile_entry *current; |
| 452 |
static struct logfile_entry *lastprinted = NULL; |
| 453 |
|
| 454 |
/* read logs */ |
| 455 |
for (current = loglist; current; current = current->next) { |
| 456 |
if (!current->fp) |
| 457 |
continue; /* skip missing files */ |
| 458 |
|
| 459 |
clearerr(current->fp); |
| 460 |
|
| 461 |
while (lineinput(buf, buflen, current->fp) != 0) { |
| 462 |
/* print filename if any, and if last line was from |
| 463 |
different file */ |
| 464 |
if (!opt_nofilename && |
| 465 |
!(lastprinted && lastprinted == current) && |
| 466 |
current->desc[0]) { |
| 467 |
SCROLL_UP(lines, listlen); |
| 468 |
sprintf(lines[listlen - 1].line, "[%s]", current->desc); |
| 469 |
lines[listlen - 1].color = current->color; |
| 470 |
} |
| 471 |
|
| 472 |
SCROLL_UP(lines, listlen); |
| 473 |
strcpy(lines[listlen - 1].line, buf); |
| 474 |
lines[listlen - 1].color = current->color; |
| 475 |
|
| 476 |
lastprinted = current; |
| 477 |
need_update = 1; |
| 478 |
} |
| 479 |
} |
| 480 |
|
| 481 |
if (need_update) |
| 482 |
redraw(); |
| 483 |
else { |
| 484 |
XFlush(disp); |
| 485 |
if (!XPending(disp)) { |
| 486 |
fd_set fdr; |
| 487 |
struct timeval to = interval; |
| 488 |
|
| 489 |
FD_ZERO(&fdr); |
| 490 |
FD_SET(ConnectionNumber(disp), &fdr); |
| 491 |
select(ConnectionNumber(disp) + 1, &fdr, 0, 0, &to); |
| 492 |
} |
| 493 |
} |
| 494 |
|
| 495 |
check_open_files(); |
| 496 |
|
| 497 |
if (do_reopen) |
| 498 |
reopen(); |
| 499 |
|
| 500 |
/* we ignore possible errors due to window resizing &c */ |
| 501 |
while (XPending(disp)) { |
| 502 |
XNextEvent(disp, &xev); |
| 503 |
switch (xev.type) { |
| 504 |
case Expose: |
| 505 |
{ |
| 506 |
XRectangle r; |
| 507 |
|
| 508 |
r.x = xev.xexpose.x; |
| 509 |
r.y = xev.xexpose.y; |
| 510 |
r.width = xev.xexpose.width; |
| 511 |
r.height = xev.xexpose.height; |
| 512 |
XUnionRectWithRegion(&r, region, region); |
| 513 |
if (miny > r.y) |
| 514 |
miny = r.y; |
| 515 |
if (maxy < r.y + r.height) |
| 516 |
maxy = r.y + r.height; |
| 517 |
} |
| 518 |
break; |
| 519 |
default: |
| 520 |
#ifdef DEBUGMODE |
| 521 |
fprintf(stderr, "PANIC! Unknown event %d\n", xev.type); |
| 522 |
#endif |
| 523 |
break; |
| 524 |
} |
| 525 |
} |
| 526 |
|
| 527 |
/* reload if requested */ |
| 528 |
if (reload && lastreload + reload < time(NULL)) { |
| 529 |
if (command) |
| 530 |
system(command); |
| 531 |
|
| 532 |
reopen(); |
| 533 |
lastreload = time(NULL); |
| 534 |
} |
| 535 |
|
| 536 |
if (!XEmptyRegion(region)) { |
| 537 |
XSetRegion(disp, WinGC, region); |
| 538 |
refresh(lines, miny, maxy); |
| 539 |
XDestroyRegion(region); |
| 540 |
region = XCreateRegion(); |
| 541 |
maxy = 0; |
| 542 |
miny = win_y + h; |
| 543 |
} |
| 544 |
} |
| 545 |
} |
| 546 |
|
| 547 |
|
| 548 |
int main(int argc, char *argv[]) |
| 549 |
{ |
| 550 |
int i; |
| 551 |
int opt_daemonize = 0; |
| 552 |
#if HAS_REGEX |
| 553 |
char *transform = NULL; |
| 554 |
#endif |
| 555 |
|
| 556 |
/* window needs to be initialized before colorlookups can be done */ |
| 557 |
/* just a dummy to get the color lookups right */ |
| 558 |
geom_mask = NoValue; |
| 559 |
InitWindow(); |
| 560 |
|
| 561 |
for (i = 1; i < argc; i++) { |
| 562 |
if (argv[i][0] == '-' && argv[i][1] != '\0' && argv[i][1] != ',') { |
| 563 |
if (!strcmp(argv[i], "--?") || |
| 564 |
!strcmp(argv[i], "--help") || !strcmp(argv[i], "-h")) |
| 565 |
display_help(argv[0]); |
| 566 |
else if (!strcmp(argv[i], "-V")) |
| 567 |
display_version(); |
| 568 |
else if (!strcmp(argv[i], "-g") || !strcmp(argv[i], "-geometry")) |
| 569 |
geom_mask = XParseGeometry(argv[++i], |
| 570 |
&win_x, &win_y, &width, &listlen); |
| 571 |
else if (!strcmp(argv[i], "-display")) |
| 572 |
dispname = argv[++i]; |
| 573 |
else if (!strcmp(argv[i], "-font") || !strcmp(argv[i], "-fn")) |
| 574 |
fontname = argv[++i]; |
| 575 |
#if HAS_REGEX |
| 576 |
else if (!strcmp(argv[i], "-t")) |
| 577 |
transform = argv[++i]; |
| 578 |
#endif |
| 579 |
else if (!strcmp(argv[i], "-fork") || !strcmp(argv[i], "-f")) |
| 580 |
opt_daemonize = 1; |
| 581 |
else if (!strcmp(argv[i], "-reload")) { |
| 582 |
reload = atoi(argv[++i]); |
| 583 |
command = argv[++i]; |
| 584 |
} |
| 585 |
else if (!strcmp(argv[i], "-shade")) |
| 586 |
opt_shade = 1; |
| 587 |
else if (!strcmp(argv[i], "-frame")) |
| 588 |
opt_frame = 1; |
| 589 |
else if (!strcmp(argv[i], "-no-filename")) |
| 590 |
opt_nofilename = 1; |
| 591 |
else if (!strcmp(argv[i], "-reverse")) |
| 592 |
opt_reverse = 1; |
| 593 |
else if (!strcmp(argv[i], "-color")) |
| 594 |
def_color = argv[++i]; |
| 595 |
else if (!strcmp(argv[i], "-noinitial")) |
| 596 |
opt_noinitial = 1; |
| 597 |
else if (!strcmp(argv[i], "-interval") || !strcmp(argv[i], "-i")) { |
| 598 |
double iv = atof(argv[++i]); |
| 599 |
|
| 600 |
interval.tv_sec = (int) iv; |
| 601 |
interval.tv_usec = (iv - interval.tv_sec) * 1e6; |
| 602 |
} else { |
| 603 |
fprintf(stderr, "Unknown option '%s'.\n" |
| 604 |
"Try --help for more information.\n", argv[i]); |
| 605 |
exit(1); |
| 606 |
} |
| 607 |
} else { /* it must be a filename */ |
| 608 |
struct logfile_entry *e; |
| 609 |
const char *fname, *desc, *fcolor = def_color; |
| 610 |
char *p; |
| 611 |
|
| 612 |
/* this is not foolproof yet (',' in filenames are not allowed) */ |
| 613 |
fname = desc = argv[i]; |
| 614 |
if ((p = strchr(argv[i], ','))) { |
| 615 |
*p = '\0'; |
| 616 |
fcolor = p + 1; |
| 617 |
|
| 618 |
if ((p = strchr(fcolor, ','))) { |
| 619 |
*p = '\0'; |
| 620 |
desc = p + 1; |
| 621 |
} |
| 622 |
} |
| 623 |
|
| 624 |
e = xmalloc(sizeof(struct logfile_entry)); |
| 625 |
if (argv[i][0] == '-' && argv[i][1] == '\0') { |
| 626 |
if ((e->fp = fdopen(0, "r")) == NULL) |
| 627 |
perror("fdopen"), exit(1); |
| 628 |
if (fcntl(0, F_SETFL, O_NONBLOCK) < 0) |
| 629 |
perror("fcntl"), exit(1); |
| 630 |
e->fname = NULL; |
| 631 |
e->inode = 0; |
| 632 |
e->desc = xstrdup("stdin"); |
| 633 |
} else { |
| 634 |
int l; |
| 635 |
|
| 636 |
e->fname = xstrdup(fname); |
| 637 |
if (openlog(e) == NULL) |
| 638 |
perror(fname), exit(1); |
| 639 |
|
| 640 |
l = strlen(desc); |
| 641 |
if (l > width - 2) /* must account for [ ] */ |
| 642 |
l = width - 2; |
| 643 |
e->desc = xmalloc(l + 1); |
| 644 |
memcpy(e->desc, desc, l); |
| 645 |
*(e->desc + l) = '\0'; |
| 646 |
} |
| 647 |
|
| 648 |
e->color = GetColor(fcolor); |
| 649 |
e->next = NULL; |
| 650 |
|
| 651 |
if (!loglist) |
| 652 |
loglist = e; |
| 653 |
if (loglist_tail) |
| 654 |
loglist_tail->next = e; |
| 655 |
loglist_tail = e; |
| 656 |
} |
| 657 |
} |
| 658 |
|
| 659 |
if (!loglist) { |
| 660 |
fprintf(stderr, "You did not specify any files to tail\n" |
| 661 |
"use %s --help for help\n", argv[0]); |
| 662 |
exit(1); |
| 663 |
} |
| 664 |
|
| 665 |
#if HAS_REGEX |
| 666 |
if (transform) { |
| 667 |
int i; |
| 668 |
|
| 669 |
transformre = xmalloc(sizeof(transformre)); |
| 670 |
i = regcomp(&transformre, transform, REG_EXTENDED); |
| 671 |
if (i != 0) { |
| 672 |
char buf[512]; |
| 673 |
|
| 674 |
regerror(i, &transformre, buf, sizeof(buf)); |
| 675 |
fprintf(stderr, "Cannot compile regular expression: %s\n", buf); |
| 676 |
} |
| 677 |
} |
| 678 |
#endif |
| 679 |
|
| 680 |
InitWindow(); |
| 681 |
|
| 682 |
install_signal(SIGINT, blank_window); |
| 683 |
install_signal(SIGQUIT, blank_window); |
| 684 |
install_signal(SIGTERM, blank_window); |
| 685 |
install_signal(SIGHUP, force_reopen); |
| 686 |
install_signal(SIGUSR1, list_files); |
| 687 |
install_signal(SIGUSR2, force_refresh); |
| 688 |
|
| 689 |
if (opt_daemonize) |
| 690 |
daemonize(); |
| 691 |
|
| 692 |
main_loop(); |
| 693 |
|
| 694 |
exit(1); /* to make gcc -Wall stop complaining */ |
| 695 |
} |
| 696 |
|
| 697 |
void install_signal(int sig, void (*handler)(int)) |
| 698 |
{ |
| 699 |
struct sigaction action; |
| 700 |
|
| 701 |
action.sa_handler = handler; |
| 702 |
sigemptyset(&action.sa_mask); |
| 703 |
action.sa_flags = SA_RESTART; |
| 704 |
if (sigaction(sig, &action, NULL) < 0) |
| 705 |
fprintf(stderr, "sigaction(%d): %s\n", sig, strerror(errno)), exit(1); |
| 706 |
} |
| 707 |
|
| 708 |
void *xstrdup(const char *string) |
| 709 |
{ |
| 710 |
void *p; |
| 711 |
|
| 712 |
while ((p = strdup(string)) == NULL) { |
| 713 |
fprintf(stderr, "Memory exausted."); |
| 714 |
sleep(10); |
| 715 |
} |
| 716 |
return p; |
| 717 |
} |
| 718 |
|
| 719 |
void *xmalloc(size_t size) |
| 720 |
{ |
| 721 |
void *p; |
| 722 |
|
| 723 |
while ((p = malloc(size)) == NULL) { |
| 724 |
fprintf(stderr, "Memory exausted."); |
| 725 |
sleep(10); |
| 726 |
} |
| 727 |
return p; |
| 728 |
} |
| 729 |
|
| 730 |
void display_help(char *myname) |
| 731 |
{ |
| 732 |
printf("Usage: %s [options] file1[,color[,desc]] " |
| 733 |
"[file2[,color[,desc]] ...]\n", myname); |
| 734 |
printf(" -g | -geometry geometry -g WIDTHxHEIGHT+X+Y\n" |
| 735 |
" -color color use color $color as default\n" |
| 736 |
" -reload sec command reload after $sec and run command\n" |
| 737 |
" by default -- 3 mins\n" |
| 738 |
" -font FONTSPEC (-fn) font to use\n" |
| 739 |
" -f | -fork fork into background\n" |
| 740 |
" -reverse print new lines at the top\n" |
| 741 |
" -shade add shading to font\n" |
| 742 |
" -noinitial don't display the last file lines on\n" |
| 743 |
" startup\n" |
| 744 |
" -i | -interval seconds interval between checks (fractional\n" |
| 745 |
" values o.k.). Default 3\n" |
| 746 |
" -V display version information and exit\n" |
| 747 |
"\n"); |
| 748 |
printf("Example:\n%s -g 80x25+100+50 -font fixed /var/log/messages,green " |
| 749 |
"/var/log/secure,red,'ALERT'\n", myname); |
| 750 |
exit(0); |
| 751 |
} |
| 752 |
|
| 753 |
void display_version(void) { |
| 754 |
printf("root-tail version " VERSION "\n"); |
| 755 |
exit(0); |
| 756 |
} |
| 757 |
|
| 758 |
int daemonize(void) { |
| 759 |
switch (fork()) { |
| 760 |
case -1: |
| 761 |
return -1; |
| 762 |
case 0: |
| 763 |
break; |
| 764 |
default: |
| 765 |
_exit(0); |
| 766 |
} |
| 767 |
|
| 768 |
if (setsid() == -1) |
| 769 |
return -1; |
| 770 |
|
| 771 |
return 0; |
| 772 |
} |
| 773 |
|
