QProcess/Unix: update the close-file-descriptors feature with a minimum
So that one can pass a few extra file descriptors to the child while
still closing all the rest.
strace -f of this test showed on Linux:
[pid 117952] dup3(4, 0, 0) = 0
[pid 117952] dup3(9, 1, 0) = 1
[pid 117952] dup3(11, 2, 0) = 2
[pid 117952] close(12) = 0
[pid 117952] dup2(100, 3) = 3
[pid 117952] close_range(4, 2147483647, 0) = 0
[pid 117952] execve("testUnixProcessParameters/testUnixProcessParameters", ["testUnixProcessParameters/testUn"..., "file-descriptors2", "3", "100"], 0x561793dc87d0 /* 120 vars */ <unfinished ...>
Pick-to: 6.6
Change-Id: I3e3bfef633af4130a03afffd175e984bf50b558d
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
abd2ffc149