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std: refactor fs.openFileZ flag handling

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daurnimator 2020-08-24 02:27:26 +10:00
parent 4e63cae369
commit 23a81b4396
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1 changed files with 16 additions and 12 deletions
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28
lib/std/fs.zig
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@ -686,21 +686,25 @@ pub const Dir = struct {
return self.openFileW(path_w.span(), flags);
}
var os_flags: u32 = os.O_CLOEXEC;
// Use the O_ locking flags if the os supports them
// (Or if it's darwin, as darwin's `open` doesn't support the O_SYNC flag)
const has_flock_open_flags = @hasDecl(os, "O_EXLOCK") and !is_darwin;
const nonblocking_lock_flag = if (has_flock_open_flags and flags.lock_nonblocking)
os.O_NONBLOCK | os.O_SYNC
else
@as(u32, 0);
const lock_flag: u32 = if (has_flock_open_flags) switch (flags.lock) {
.None => @as(u32, 0),
.Shared => os.O_SHLOCK | nonblocking_lock_flag,
.Exclusive => os.O_EXLOCK | nonblocking_lock_flag,
} else 0;
const O_LARGEFILE = if (@hasDecl(os, "O_LARGEFILE")) os.O_LARGEFILE else 0;
const os_flags = lock_flag | O_LARGEFILE | os.O_CLOEXEC | if (flags.write and flags.read)
if (has_flock_open_flags) {
const nonblocking_lock_flag = if (flags.lock_nonblocking)
os.O_NONBLOCK | os.O_SYNC
else
@as(u32, 0);
os_flags |= switch (flags.lock) {
.None => @as(u32, 0),
.Shared => os.O_SHLOCK | nonblocking_lock_flag,
.Exclusive => os.O_EXLOCK | nonblocking_lock_flag,
};
}
if (@hasDecl(os, "O_LARGEFILE")) {
os_flags |= os.O_LARGEFILE;
}
os_flags |= if (flags.write and flags.read)
@as(u32, os.O_RDWR)
else if (flags.write)
@as(u32, os.O_WRONLY)