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linux: Doc and check retval for no-fail pid calls

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The switch from @bitCast() to @intCast() here safety-checks
Linux's assertion that these 3 calls never return errors (negative
values as pid_t).  getppid() can legally return 0 if the parent is
in a different pid namespace, but this is not an error.
This commit is contained in:
Brandon Black 2025-09-12 07:20:08 -05:00
parent 04071d64bb
commit 6dbfba526f
1 changed files with 6 additions and 3 deletions
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9
lib/std/os/linux.zig
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@ -1839,15 +1839,18 @@ pub fn setsid() usize {
}
pub fn getpid() pid_t {
return @bitCast(@as(u32, @truncate(syscall0(.getpid))));
// Casts result to a pid_t, safety-checking >= 0, because getpid() cannot fail
return @intCast(@as(u32, @truncate(syscall0(.getpid))));
}
pub fn getppid() pid_t {
return @bitCast(@as(u32, @truncate(syscall0(.getppid))));
// Casts result to a pid_t, safety-checking >= 0, because getppid() cannot fail
return @intCast(@as(u32, @truncate(syscall0(.getppid))));
}
pub fn gettid() pid_t {
return @bitCast(@as(u32, @truncate(syscall0(.gettid))));
// Casts result to a pid_t, safety-checking >= 0, because gettid() cannot fail
return @intCast(@as(u32, @truncate(syscall0(.gettid))));
}
pub fn sigprocmask(flags: u32, noalias set: ?*const sigset_t, noalias oldset: ?*sigset_t) usize {