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Fix the TODO portion of recently added posix_fallocate on OS X. (#21387)

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(cherry picked from commit fdd7520257)
This commit is contained in:
c-blake
2023-02-22 13:54:04 -05:00
committed by narimiran
parent 60350eca1a
commit 69d4e49630
1 changed files with 17 additions and 2 deletions
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19
lib/posix/posix.nim
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@@ -201,9 +201,24 @@ proc posix_fadvise*(a1: cint, a2, a3: Off, a4: cint): cint {.
proc ftruncate*(a1: cint, a2: Off): cint {.importc, header: "<unistd.h>".}
when defined(osx): # 2001 POSIX evidently does not concern Apple
type FStore {.importc: "fstore_t", header: "<fcntl.h>", bycopy.} = object
fst_flags: uint32 ## IN: flags word
fst_posmode: cint ## IN: indicates offset field
fst_offset, ## IN: start of the region
fst_length, ## IN: size of the region
fst_bytesalloc: Off ## OUT: number of bytes allocated
var F_PEOFPOSMODE {.importc, header: "<fcntl.h>".}: cint
var F_ALLOCATEALL {.importc, header: "<fcntl.h>".}: uint32
var F_PREALLOCATE {.importc, header: "<fcntl.h>".}: cint
proc posix_fallocate*(a1: cint, a2, a3: Off): cint =
ftruncate(a1, a2 + a3) # Set size to off + len, max offset
else: # TODO: Use fcntl(fd, F_PREALLOCATE, ..) above
var fst = FStore(fst_flags: F_ALLOCATEALL, fst_posmode: F_PEOFPOSMODE,
fst_offset: a2, fst_length: a3)
# Must also call ftruncate to match what POSIX does. Unlike posix_fallocate,
# this can shrink files. Could guard w/getFileSize, but caller likely knows
# present size & has no good reason to call this unless it is growing.
if fcntl(a1, F_PREALLOCATE, fst.addr) != cint(-1): ftruncate(a1, a2 + a3)
else: cint(-1)
else:
proc posix_fallocate*(a1: cint, a2, a3: Off): cint {.
importc, header: "<fcntl.h>".}