/* * Copyright 1998 by Albert Cahalan; all rights resered. * This file may be used subject to the terms and conditions of the * GNU Library General Public License Version 2, or any later version * at your option, as published by the Free Software Foundation. * This program 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 Library General Public License for more details. */ #include #include #include #include #include #include #include #include #include "devname.h" #include #ifndef PAGE_SIZE #define PAGE_SIZE (sizeof(long)*1024) #endif /* Who uses what: * * tty_to_dev oldps, w (there is a fancy version in ps) * dev_to_tty oldps, top, ps */ typedef struct tty_map_node { struct tty_map_node *next; int major_number; /* not unsigned! Ugh... */ char name[4]; } tty_map_node; static tty_map_node *tty_map = NULL; /* Load /proc/tty/drivers for device name mapping use. */ static void load_drivers(void){ char buf[10000]; char *p; int fd; int bytes; fd = open("/proc/tty/drivers",O_RDONLY); if(fd == -1) goto fail; bytes = read(fd, buf, 9999); if(bytes == -1) goto fail; buf[bytes] = '\0'; p = buf; while(( p = strstr(p, " /dev/tty") )){ tty_map_node *tmn; int len; p += 9; len = strspn(p, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"); if(!len) continue; if(len>3) continue; if((len=1) && (*p=='S')) continue; tmn = malloc(sizeof(tty_map_node)); tmn->next = tty_map; tty_map = tmn; memset(tmn->name, '\0', 4); strncpy(tmn->name, p, len); p += len; tmn->major_number = atoi(p); } fail: if(fd != -1) close(fd); if(!tty_map) tty_map = (tty_map_node *)-1; } /* Try to guess the device name from /proc/tty/drivers info. */ static int driver_name(char * const buf, int maj, int min){ struct stat sbuf; tty_map_node *tmn; if(!tty_map) load_drivers(); if(tty_map == (tty_map_node *)-1) return 0; tmn = tty_map; for(;;){ if(!tmn) return 0; if(tmn->major_number == maj) break; tmn = tmn->next; } sprintf(buf, "/dev/tty%s%d", tmn->name, min); /* like "/dev/ttyZZ255" */ if(stat(buf, &sbuf) < 0) return 0; if(min != minor(sbuf.st_rdev)) return 0; if(maj != major(sbuf.st_rdev)) return 0; return 1; } /* Try to guess the device name (useful until /proc/PID/tty is added) */ static int guess_name(char * const buf, int maj, int min){ struct stat sbuf; int t0, t1; int tmpmin = min; switch(maj){ case 4: if(min<64){ sprintf(buf, "/dev/tty%d", min); break; } if(min<128){ /* to 255 on newer systems */ sprintf(buf, "/dev/ttyS%d", min-64); break; } tmpmin = min & 0x3f; /* FALL THROUGH */ case 3: /* /dev/[pt]ty[p-za-o][0-9a-z] is 936 */ t0 = "pqrstuvwxyzabcde"[tmpmin>>4]; t1 = "0123456789abcdef"[tmpmin&0x0f]; sprintf(buf, "/dev/tty%c%c", t0, t1); break; case 17: sprintf(buf, "/dev/ttyH%d", min); break; case 19: sprintf(buf, "/dev/ttyC%d", min); break; case 22: sprintf(buf, "/dev/ttyD%d", min); break; /* devices.txt */ case 23: sprintf(buf, "/dev/ttyD%d", min); break; /* driver code */ case 24: sprintf(buf, "/dev/ttyE%d", min); break; case 32: sprintf(buf, "/dev/ttyX%d", min); break; case 43: sprintf(buf, "/dev/ttyI%d", min); break; case 46: sprintf(buf, "/dev/ttyR%d", min); break; case 48: sprintf(buf, "/dev/ttyL%d", min); break; case 57: sprintf(buf, "/dev/ttyP%d", min); break; case 71: sprintf(buf, "/dev/ttyF%d", min); break; case 75: sprintf(buf, "/dev/ttyW%d", min); break; case 78: sprintf(buf, "/dev/ttyM%d", min); break; /* conflict */ case 105: sprintf(buf, "/dev/ttyV%d", min); break; case 112: sprintf(buf, "/dev/ttyM%d", min); break; /* conflict */ /* 136 ... 143 are /dev/pts/0, /dev/pts/1, /dev/pts/2 ... */ case 136 ... 143: sprintf(buf, "/dev/pts/%d", min+(maj-136)*256); break; case 148: sprintf(buf, "/dev/ttyT%d", min); break; case 154: sprintf(buf, "/dev/ttySR%d", min); break; case 156: sprintf(buf, "/dev/ttySR%d", min+256); break; case 164: sprintf(buf, "/dev/ttyCH%d", min); break; case 166: sprintf(buf, "/dev/ttyACM%d", min); break; /* bummer, 9-char */ case 172: sprintf(buf, "/dev/ttyMX%d", min); break; case 174: sprintf(buf, "/dev/ttySI%d", min); break; case 188: sprintf(buf, "/dev/ttyUSB%d", min); break; /* bummer, 9-char */ default: return 0; } if(stat(buf, &sbuf) < 0) return 0; if(min != minor(sbuf.st_rdev)) return 0; if(maj != major(sbuf.st_rdev)) return 0; return 1; } /* Linux 2.2 can give us filenames that might be correct. * Useful names could be in /proc/PID/fd/2 (stderr, seldom redirected) * and in /proc/PID/fd/255 (used by bash to remember the tty). */ static int link_name(char * const buf, int maj, int min, int pid, char *name){ struct stat sbuf; char path[32]; int count; sprintf(path, "/proc/%d/%s", pid, name); /* often permission denied */ count = readlink(path,buf,PAGE_SIZE-1); if(count == -1) return 0; buf[count] = '\0'; if(stat(buf, &sbuf) < 0) return 0; if(min != minor(sbuf.st_rdev)) return 0; if(maj != major(sbuf.st_rdev)) return 0; return 1; } /* number --> name */ int dev_to_tty(char *ret, int chop, int dev, int pid, unsigned int flags) { static char buf[PAGE_SIZE]; char *tmp = buf; int i = 0; int c; if((short)dev == (short)-1) goto fail; if( link_name(tmp, major(dev), minor(dev), pid, "tty" )) goto abbrev; if( link_name(tmp, major(dev), minor(dev), pid, "fd/2" )) goto abbrev; if( guess_name(tmp, major(dev), minor(dev) )) goto abbrev; if( link_name(tmp, major(dev), minor(dev), pid, "fd/255")) goto abbrev; if(driver_name(tmp, major(dev), minor(dev) )) goto abbrev; fail: strcpy(ret, "?"); return 1; abbrev: if((flags&ABBREV_DEV) && !strncmp(tmp,"/dev/",5) && tmp[5]) tmp += 5; if((flags&ABBREV_TTY) && !strncmp(tmp,"tty", 3) && tmp[3]) tmp += 3; if((flags&ABBREV_PTS) && !strncmp(tmp,"pts/", 4) && tmp[4]) tmp += 4; tmp[chop] = '\0'; for(;;){ c = *tmp; tmp++; if(!c) break; i++; if(c<=' ') c = '?'; if(c>126) c = '?'; *ret = c; ret++; } *ret = '\0'; return i; } /* name --> number */ int tty_to_dev(char *name) { struct stat sbuf; static char buf[32]; if(stat(name, &sbuf) >= 0) return sbuf.st_rdev; snprintf(buf,32,"/dev/%s",name); if(stat(buf, &sbuf) >= 0) return sbuf.st_rdev; snprintf(buf,32,"/dev/tty%s",name); if(stat(buf, &sbuf) >= 0) return sbuf.st_rdev; snprintf(buf,32,"/dev/pts/%s",name); if(stat(buf, &sbuf) >= 0) return sbuf.st_rdev; return -1; }