Update to musl 1.2.2.

[wasi-libc.git] / libc-top-half / musl / src / unistd / readlinkat.c

diff --git a/libc-top-half/musl/src/unistd/readlinkat.c b/libc-top-half/musl/src/unistd/readlinkat.c
index 9af45cd5a47d1e23c673806704a2cf07d75d948f..f79d3d14280ec46afc56dc715f684a1b0cd721e5 100644 (file)
--- a/libc-top-half/musl/src/unistd/readlinkat.c
+++ b/libc-top-half/musl/src/unistd/readlinkat.c
@@ -3,5 +3,12 @@
 
 ssize_t readlinkat(int fd, const char *restrict path, char *restrict buf, size_t bufsize)
 {
-       return syscall(SYS_readlinkat, fd, path, buf, bufsize);
+       char dummy[1];
+       if (!bufsize) {
+               buf = dummy;
+               bufsize = 1;
+       }
+       int r = __syscall(SYS_readlinkat, fd, path, buf, bufsize);
+       if (buf == dummy && r > 0) r = 0;
+       return __syscall_ret(r);
 }