3 ms·

Last time I looked, posix_spawn() just called fork/exec

• int_19h 4y ago
  That's an implementation detail at this point. The idea is to have a single syscall that takes all the information needed to spawn the process, and does so atomically, without the need to spread it across several calls. On Win32, that's CreateProcess(). On POSIX, the equivalent is posix_spawn().
• cryptonector 4y ago
  In glibc it uses vfork() in some cases. In Solaris/Illumos it uses vfork() or vforkx(). In principle posix_spawn() can be a system call.
  • comex 4y ago
    On macOS it is a system call.