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13.111.2 wait4

LSB specification:
https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib-wait4-2.html

Documentation:

• https://www.gnu.org/software/libc/manual/html_node/Process-Completion.html,
• man wait4.

Gnulib module: —

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

• This function is missing on some platforms: Minix 3.1.8, HP-UX 11.11, IRIX 6.5, mingw, MSVC 14, Android 4.2.