[libc-commits] [PATCH] D129963: [libc] use correct syscall define for SYS__llseek

Joost Heitbrink via Phabricator via libc-commits libc-commits at lists.llvm.org
Sun Jul 17 04:30:11 PDT 2022

gytsen created this revision.
gytsen added reviewers: michaelrj, sivachandra, lntue.
Herald added subscribers: libc-commits, ecnelises, tschuett.
Herald added projects: libc-project, All.
gytsen requested review of this revision.

Prior to this revision, the preprocessor would correctly look for the
definition of SYS__llseek. However, the resulting call to syscall(2)
would be done in this branch using SYS__lseek.


Fix this by calling syscall(2) using SYS__llseek.

fixes #56122 <https://github.com/llvm/llvm-project/issues/56122>

  rG LLVM Github Monorepo



Index: libc/src/__support/File/linux_file.cpp
--- libc/src/__support/File/linux_file.cpp
+++ libc/src/__support/File/linux_file.cpp
@@ -77,7 +77,7 @@
   long ret = __llvm_libc::syscall(SYS_lseek, lf->get_fd(), offset, whence);
 #elif defined(SYS__llseek)
   long result;
-  long ret = __llvm_libc::syscall(SYS__lseek, lf->get_fd(), offset >> 32,
+  long ret = __llvm_libc::syscall(SYS__llseek, lf->get_fd(), offset >> 32,
                                   offset, &result, whence);
 #error "lseek and _llseek syscalls not available to perform a seek operation."

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