projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 2ce81398 DS |
1 | #if defined(LIBC_SCCS) && !defined(lint) |
| 2 | static char sccsid[] = "@(#)ttyname.c 5.2 (Berkeley) %G%"; | |
| 3 | #endif LIBC_SCCS and not lint | |
| b8f253e8 | 4 | |
| b11ade1b BJ |
5 | /* |
| 6 | * ttyname(f): return "/dev/ttyXX" which the the name of the | |
| 7 | * tty belonging to file f. | |
| 8 | * NULL if it is not a tty | |
| 9 | */ | |
| 10 | ||
| 11 | #define NULL 0 | |
| 164a2d2d | 12 | #include <sys/param.h> |
| c9f0b4d5 | 13 | #include <sys/dir.h> |
| b11ade1b BJ |
14 | #include <sys/stat.h> |
| 15 | ||
| 16 | static char dev[] = "/dev/"; | |
| 17 | char *strcpy(); | |
| 18 | char *strcat(); | |
| 19 | ||
| 20 | char * | |
| 21 | ttyname(f) | |
| 22 | { | |
| 23 | struct stat fsb; | |
| 24 | struct stat tsb; | |
| 164a2d2d KM |
25 | register struct direct *db; |
| 26 | register DIR *df; | |
| b11ade1b | 27 | static char rbuf[32]; |
| b11ade1b BJ |
28 | |
| 29 | if (isatty(f)==0) | |
| 30 | return(NULL); | |
| 31 | if (fstat(f, &fsb) < 0) | |
| 32 | return(NULL); | |
| 33 | if ((fsb.st_mode&S_IFMT) != S_IFCHR) | |
| 34 | return(NULL); | |
| 164a2d2d | 35 | if ((df = opendir(dev)) == NULL) |
| b11ade1b | 36 | return(NULL); |
| 164a2d2d KM |
37 | while ((db = readdir(df)) != NULL) { |
| 38 | if (db->d_ino != fsb.st_ino) | |
| b11ade1b BJ |
39 | continue; |
| 40 | strcpy(rbuf, dev); | |
| 164a2d2d | 41 | strcat(rbuf, db->d_name); |
| b11ade1b BJ |
42 | if (stat(rbuf, &tsb) < 0) |
| 43 | continue; | |
| 164a2d2d KM |
44 | if (tsb.st_dev == fsb.st_dev && tsb.st_ino == fsb.st_ino) { |
| 45 | closedir(df); | |
| b11ade1b BJ |
46 | return(rbuf); |
| 47 | } | |
| 48 | } | |
| 164a2d2d | 49 | closedir(df); |
| b11ade1b BJ |
50 | return(NULL); |
| 51 | } |