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Don't use readlinkat if it does not exist

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This fixes bug #377.
This commit is contained in:
Marcus Comstedt 2014-07-04 11:55:04 +02:00 committed by Uwe Hermann
parent 970f279ae4
commit 5bd33b7c8b
2 changed files with 11 additions and 0 deletions
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3
configure.ac
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@ -119,6 +119,9 @@ 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)], [])
saved="$CFLAGS"; CFLAGS="$CFLAGS -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
__attribute__((visibility("hidden"))) void foo(void) { }

8
linux.c
View File

@ -161,6 +161,9 @@ SP_PRIV enum sp_return list_ports(struct sp_port ***list)
char name[PATH_MAX], target[PATH_MAX];
struct dirent entry, *result;
struct serial_struct serial_info;
#ifndef HAVE_READLINKAT
char buf[sizeof(entry.d_name) + 16];
#endif
int len, fd, ioctl_result;
DIR *dir;
int ret = SP_OK;
@ -171,7 +174,12 @@ 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;