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64-bit stat size, read entire executable in one go

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This commit is contained in:
Jeremy Soller 2016-09-28 20:42:03 -06:00
parent 83ff36a4c3
commit 5e1d2f8c64
6 changed files with 12 additions and 24 deletions
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15
kernel/syscall/process.rs
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@ -17,6 +17,7 @@ use context::memory::Grant;
use elf::{self, program_header};
use scheme;
use syscall;
use syscall::data::Stat;
use syscall::error::*;
use syscall::flag::{CLONE_VM, CLONE_FS, CLONE_FILES, MAP_WRITE, MAP_WRITE_COMBINE, WNOHANG};
use syscall::validate::{validate_slice, validate_slice_mut};
@ -391,17 +392,11 @@ pub fn exec(path: &[u8], arg_ptrs: &[[usize; 2]]) -> Result<usize> {
}
let file = syscall::open(path, 0)?;
let mut stat = Stat::default();
syscall::fstat(file, &mut stat)?;
//TODO: Only read elf header, not entire file. Then read required segments
let mut data = vec![];
loop {
let mut buf = [0; 16384];
let count = syscall::read(file, &mut buf)?;
if count > 0 {
data.extend_from_slice(&buf[..count]);
} else {
break;
}
}
let mut data = vec![0; stat.st_size as usize];
syscall::read(file, &mut data)?;
let _ = syscall::close(file);
match elf::Elf::from(&data) {