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Diffstat (limited to 'libbb/platform.c')
-rw-r--r--libbb/platform.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/libbb/platform.c b/libbb/platform.c
index 8d90ca4e9..03bbb798b 100644
--- a/libbb/platform.c
+++ b/libbb/platform.c
@@ -194,3 +194,22 @@ ssize_t FAST_FUNC getline(char **lineptr, size_t *n, FILE *stream)
194 return len; 194 return len;
195} 195}
196#endif 196#endif
197
198#ifndef HAVE_TTYNAME_R
199int ttyname_r(int fd, char *buf, size_t buflen)
200{
201 int r;
202 char path[sizeof("/proc/self/fd/%d") + sizeof(int)*3];
203
204 if (!isatty(fd))
205 return errno == EINVAL ? ENOTTY : errno;
206 sprintf(path, "/proc/self/fd/%d", fd);
207 r = readlink(path, buf, buflen);
208 if (r < 0)
209 return errno;
210 if (r >= buflen)
211 return ERANGE;
212 buf[r] = '\0';
213 return 0;
214}
215#endif