EF_VFORK_MODE

Name

vfork_mode

Default

1

Minimum

0

Maximum

2

Scope

per-process

This option dictates how vfork() intercept should work. After a vfork(), parent and child still share address space but not file descriptors. We have to be careful about making changes in the child that can be seen in the parent. We offer three options here. Different apps might require different options depending on their use of vfork(). If using EF_VFORK_MODE=2, it is not safe to create sockets or pipes in the child before calling exec().

• 0 - Old behavior. Replace vfork() with fork()
• 1 - Replace vfork() with fork() and block parent till child exits/execs
• 2 - Replace vfork() with vfork().