From: Aurelien Jacobs <redacted>
Date: Thu, 4 Sep 2014 18:13:55 +0000 (+0200)
Subject: linux: remove readlinkat() dependency
X-Git-Tag: libserialport-0.1.1~102
X-Git-Url: https://sigrok.org/gitweb/?p=libserialport.git;a=commitdiff_plain;h=653cef3ab1a71a76c8c5a503af6ce74b731ecc42

linux: remove readlinkat() dependency
---

diff --git a/configure.ac b/configure.ac
index 457d6f9..96d5277 100644
--- a/configure.ac
+++ b/configure.ac
@@ -119,9 +119,6 @@ AC_CHECK_MEMBERS([struct termios.c_ispeed, struct termios.c_ospeed],
 AC_CHECK_MEMBERS([struct termios2.c_ispeed, struct termios2.c_ospeed],
 	[AC_DEFINE(HAVE_TERMIOS2_SPEED, 1)], [], [[#include <linux/termios.h>]])
 
-# Check for readlinkat.
-AC_CHECK_FUNC([readlinkat], [AC_DEFINE(HAVE_READLINKAT, 1)], [])
-
 # Check for serial_struct.
 AC_CHECK_TYPE([struct serial_struct], [AC_DEFINE(HAVE_SERIAL_STRUCT, 1)],
         [], [[#include <linux/serial.h>]])
diff --git a/libserialport_internal.h b/libserialport_internal.h
index bef84b6..9d582f8 100644
--- a/libserialport_internal.h
+++ b/libserialport_internal.h
@@ -20,7 +20,6 @@
 
 #ifdef __linux__
 #define _BSD_SOURCE // for timeradd, timersub, timercmp
-#define _XOPEN_SOURCE 700 // for readlinkat
 #endif
 
 #include <string.h>
diff --git a/linux.c b/linux.c
index e995347..61446a4 100644
--- a/linux.c
+++ b/linux.c
@@ -165,9 +165,7 @@ SP_PRIV enum sp_return list_ports(struct sp_port ***list)
 	struct serial_struct serial_info;
 	int ioctl_result;
 #endif
-#ifndef HAVE_READLINKAT
 	char buf[sizeof(entry.d_name) + 16];
-#endif
 	int len, fd;
 	DIR *dir;
 	int ret = SP_OK;
@@ -178,12 +176,8 @@ SP_PRIV enum sp_return list_ports(struct sp_port ***list)
 
 	DEBUG("Iterating over results");
 	while (!readdir_r(dir, &entry, &result) && result) {
-#ifdef HAVE_READLINKAT
-		len = readlinkat(dirfd(dir), entry.d_name, target, sizeof(target));
-#else
 		snprintf(buf, sizeof(buf), "/sys/class/tty/%s", entry.d_name);
 		len = readlink(buf, target, sizeof(target));
-#endif
 		if (len <= 0 || len >= (int) sizeof(target)-1)
 			continue;
 		target[len] = 0;