1987-03-31 10:45:53 +00:00
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/* $Header$ */
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1987-01-27 15:57:55 +00:00
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/dir.h>
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#define DEV "/dev/"
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extern char *strcpy(), *strcat();
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char *
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ttyname(filedes)
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{
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static char result[MAXNAMLEN + 1 + 5];
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DIR *dirp;
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register struct direct *dp;
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struct stat fdstat;
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ino_t inode;
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dev_t device;
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char *name;
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if (! isatty(filedes) ||
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fstat(filedes, &fdstat) < 0 ||
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(fdstat.st_mode & S_IFMT) != S_IFCHR ||
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(dirp = opendir(DEV)) == NULL) {
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return 0;
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}
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inode = fdstat.st_ino;
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device = fdstat.st_rdev;
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while ((dp = readdir(dirp)) != NULL) {
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if (dp->d_ino != inode) continue;
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strcpy(result, DEV);
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strcat(result, dp->d_name);
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if (stat(result, &fdstat) < 0) continue;
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if (fdstat.st_rdev == device &&
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(fdstat.st_mode & S_IFMT) == S_IFCHR) {
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closedir(dirp);
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return result;
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}
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}
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closedir(dirp);
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return 0;
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}
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