[tor-bugs] #28688 [Core Tor/Torsocks]: torsocks: Unsupported syscall errors in version 2.3.0

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#28688: torsocks: Unsupported syscall errors in version 2.3.0
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 Reporter:  yurivict271   |          Owner:  dgoulet
     Type:  defect        |         Status:  new
 Priority:  Medium        |      Component:  Core Tor/Torsocks
  Version:  Tor: 0.3.4.9  |       Severity:  Normal
 Keywords:                |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
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 Copied from the downstream bug report:
 {{{
 After upgrading to torsocks-2.3.0, I get an error when using torify:

 $ torify git clone https://github.com/freebsd/poudriere.git
 1543787510 WARNING torsocks[25796]: [syscall] Unsupported syscall number
 20. Denying the call (in tsocks_syscall() at syscall.c:568)
 Cloning into 'poudriere'...
 1543787510 WARNING torsocks[25796]: [syscall] Unsupported syscall number
 2. Denying the call (in tsocks_syscall() at syscall.c:568)
 error: cannot fork() for git-remote-https: Function not implemented

 The same command works with torsocks 2.2.0.

 syscall number 2 is fork. There have been some changes to syscall.c which
 may cause this issue.
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28688>
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