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-rw-r--r--include/platform.h7
-rw-r--r--libbb/platform.c19
2 files changed, 26 insertions, 0 deletions
diff --git a/include/platform.h b/include/platform.h
index df9594507..d5ab7bc29 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -368,6 +368,7 @@ typedef unsigned smalluint;
#define HAVE_DPRINTF 1
#define HAVE_MEMRCHR 1
#define HAVE_MKDTEMP 1
+#define HAVE_TTYNAME_R 1
#define HAVE_PTSNAME_R 1
#define HAVE_SETBIT 1
#define HAVE_SIGHANDLER_T 1
@@ -480,6 +481,7 @@ typedef unsigned smalluint;
#if defined(ANDROID) || defined(__ANDROID__)
# undef HAVE_DPRINTF
+# undef HAVE_TTYNAME_R
# undef HAVE_GETLINE
# undef HAVE_STPCPY
# undef HAVE_STRCHRNUL
@@ -505,6 +507,11 @@ extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
extern char *mkdtemp(char *template) FAST_FUNC;
#endif
+#ifndef HAVE_TTYNAME_R
+#define ttyname_r bb_ttyname_r
+extern int ttyname_r(int fd, char *buf, size_t buflen);
+#endif
+
#ifndef HAVE_SETBIT
# define setbit(a, b) ((a)[(b) >> 3] |= 1 << ((b) & 7))
# define clrbit(a, b) ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
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)
return len;
}
#endif
+
+#ifndef HAVE_TTYNAME_R
+int ttyname_r(int fd, char *buf, size_t buflen)
+{
+ int r;
+ char path[sizeof("/proc/self/fd/%d") + sizeof(int)*3];
+
+ if (!isatty(fd))
+ return errno == EINVAL ? ENOTTY : errno;
+ sprintf(path, "/proc/self/fd/%d", fd);
+ r = readlink(path, buf, buflen);
+ if (r < 0)
+ return errno;
+ if (r >= buflen)
+ return ERANGE;
+ buf[r] = '\0';
+ return 0;
+}
+#endif