55 lines
1.3 KiB
Rust
55 lines
1.3 KiB
Rust
//ignore-windows: Uses POSIX APIs
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//compile-flags: -Zmiri-seed=
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#![feature(rustc_private)]
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use core::{slice, ptr};
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extern crate libc;
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fn main() {
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// Test that small allocations sometimes *are* not very aligned.
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let saw_unaligned = (0..64).any(|_| unsafe {
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let p = libc::malloc(3);
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libc::free(p);
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(p as usize) % 4 != 0 // find any that this is *not* 4-aligned
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});
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assert!(saw_unaligned);
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unsafe {
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// Use calloc for initialized memory
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let p1 = libc::calloc(20, 1);
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// old size < new size
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let p2 = libc::realloc(p1, 40);
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let slice = slice::from_raw_parts(p2 as *const u8, 20);
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assert_eq!(&slice, &[0_u8; 20]);
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// old size == new size
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let p3 = libc::realloc(p2, 40);
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let slice = slice::from_raw_parts(p3 as *const u8, 20);
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assert_eq!(&slice, &[0_u8; 20]);
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// old size > new size
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let p4 = libc::realloc(p3, 10);
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let slice = slice::from_raw_parts(p4 as *const u8, 10);
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assert_eq!(&slice, &[0_u8; 10]);
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libc::free(p4);
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}
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unsafe {
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let p1 = libc::malloc(20);
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let p2 = libc::realloc(p1, 0);
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assert!(p2.is_null());
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}
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unsafe {
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let p1 = libc::realloc(ptr::null_mut(), 20);
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assert!(!p1.is_null());
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libc::free(p1);
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}
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}
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