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7b7d16da48
This was based on a misunderstanding. On musl, 64-bit time_t on 32-bit architectures was introduced in version 1.2.0, by introducing new symbols. The old symbols still exist, to allow programs compiled against older versions to keep running on 1.2.0+, preserving ABI-compatibility. (see musl commit 38143339646a4ccce8afe298c34467767c899f51) Programs compiled against 1.2.0+ will get the new symbols, and will therefore think time_t is 64-bit. Unfortunately, rust's libc crate uses its own definition of these types, and does not check for musl version. Currently, it includes the pre-1.2.0 32-bit type. That means: - If you run on a 32-bit system like i686 - ... and compile against a C-library other than libc - ... and pass it a time_t-containing struct like timespec or stat ... you need to arrange for that library to be built against musl <1.2.0. Or, as https://github.com/ericonr/rust-time64 says: > Therefore, for "old" 32-bit targets (riscv32 is supposed to default to time64), > any Rust code that interacts with C code built on musl after 1.2.0, > using types based on time_t (arguably, the main ones are struct timespec and struct stat) in their interface, > will be completely miscompiled. However, while fish runs on i686 and compiles against pcre2, we do not pass pcre2 a time_t. Our only uses of time_t are confined to interactions with libc, in which case with musl we would simply use the legacy ABI. I have compiled an i686 fish against musl to confirm and can find no issue. This reverts commit55196ee2a0. This reverts commit4992f88966. This reverts commit46c8ba2c9f. This reverts commit3a9b4149da. This reverts commit5f9e9cbe74. This reverts commit338579b78c. This reverts commitd19e5508d7. This reverts commitb64045dc18. Closes #10634
40 lines
1.0 KiB
Rust
40 lines
1.0 KiB
Rust
//! Safe wrappers around various libc functions that we might want to reuse across modules.
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use std::time::Duration;
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#[allow(clippy::unnecessary_cast)]
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pub const fn timeval_to_duration(val: &libc::timeval) -> Duration {
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let micros = val.tv_sec as i64 * (1E6 as i64) + val.tv_usec as i64;
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Duration::from_micros(micros as u64)
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}
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pub trait TimevalExt {
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fn as_micros(&self) -> i64;
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fn as_duration(&self) -> Duration;
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}
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impl TimevalExt for libc::timeval {
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fn as_micros(&self) -> i64 {
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timeval_to_duration(self).as_micros() as i64
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}
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fn as_duration(&self) -> Duration {
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timeval_to_duration(self)
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}
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}
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pub fn geteuid() -> u32 {
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unsafe { libc::geteuid() }
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}
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pub fn getegid() -> u32 {
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unsafe { libc::getegid() }
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}
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pub fn getpid() -> i32 {
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unsafe { libc::getpid() }
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}
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pub fn isatty(fd: i32) -> bool {
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// This returns false if the fd is valid but not a tty, or is invalid.
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// No place we currently call it really cares about the difference.
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return unsafe { libc::isatty(fd) } == 1;
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}
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