tree feb420206228a56c723fb44a27643ad3050b13b3
parent d1cd1de72a8f88c3b44c2eacb18146ffd3adee2e
author Mikhail R. Gadelha <mikhail@igalia.com> 1783433340 -0300
committer GitHub <noreply@github.com> 1783433340 -0300
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[libc] Use the dup2 syscall wrapper in posix_spawn (#207879)

posix_spawn's local dup2 helper fell back to a bare dup3 on targets
without SYS_dup2. dup3 fails with EINVAL when oldfd == newfd, where dup2
must instead return oldfd if it is valid, so
posix_spawn_file_actions_adddup2 with equal fds misbehaved on those
targets. linux_syscalls::dup2 already implements the correct fallback,
so call it directly and drop the local helper.