Fix fcntl_setpipe_size return value
#1164
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fcntl_setpipe_size return value (#1163)fcntl_setpipe_size return value
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`fcntl` man page says that: > F_SETPIPE_SZ ... The actual capacity (in bytes) that is set is > returned as the function result. But the current `fcntl_setpipe_size` function assumes that the return value is 0 (success) or negative (failure). This makes the function panic due to `debug_assert!` in debug mode, and it returns `Err` on success in release mode. This commit fixes the return value type and its checking, and adds a test for it.
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fcntlman page says that:But the current
fcntl_setpipe_sizefunction assumes that the return value is 0 (success) or negative (failure). This makes the function panic due todebug_assert!in debug mode, and it returnsErron success in release mode.This commit fixes the return value type and its checking, and adds a test for it.
Closes #1163