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-rw-r--r--lib/libc/stdio/ftell.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/lib/libc/stdio/ftell.c b/lib/libc/stdio/ftell.c
index 724e543..271490a 100644
--- a/lib/libc/stdio/ftell.c
+++ b/lib/libc/stdio/ftell.c
@@ -41,6 +41,10 @@ static char sccsid[] = "@(#)ftell.c 8.1 (Berkeley) 6/4/93";
#include <stdio.h>
#include <errno.h>
#include "local.h"
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+#endif
/*
* ftell: return current offset.
@@ -56,6 +60,9 @@ ftell(fp)
return (-1L);
}
+#ifdef _THREAD_SAFE
+ _thread_flockfile((FILE *) fp,__FILE__,__LINE__);
+#endif
/*
* Find offset of underlying I/O object, then
* adjust for buffered bytes.
@@ -64,8 +71,12 @@ ftell(fp)
pos = fp->_offset;
else {
pos = (*fp->_seek)(fp->_cookie, (fpos_t)0, SEEK_CUR);
- if (pos == -1L)
+ if (pos == -1L) {
+#ifdef _THREAD_SAFE
+ _thread_funlockfile((FILE *) fp);
+#endif
return (pos);
+ }
}
if (fp->_flags & __SRD) {
/*
@@ -84,5 +95,8 @@ ftell(fp)
*/
pos += fp->_p - fp->_bf._base;
}
+#ifdef _THREAD_SAFE
+ _thread_funlockfile((FILE *) fp);
+#endif
return (pos);
}
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