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sys_read/open/close

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This commit is contained in:
xamidev
2026-05-06 13:29:35 +02:00
parent 63e9a761a3
commit c061da4d81
8 changed files with 94 additions and 37 deletions
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src/arch/x86/syscall.c
+25 -18
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@@ -70,10 +70,12 @@ int sys_read(unsigned int fd, char* buf, size_t count)
return -EBADFD; // File descriptor wasn't open
}
// Here fd refers to a valid opened file..
int sz = tar_read(current_process->fdt[fd].filename,&buf);
int sz = tar_read(current_process->fdt[fd].filename, buf, count,
current_process->fdt[fd].cursor);
if (sz == 0) {
return -ENOENT;
} else {
current_process->fdt[fd].cursor += sz;
return sz;
}
}
@@ -82,27 +84,25 @@ int sys_read(unsigned int fd, char* buf, size_t count)
}
// TODO: Should have a return value: number of bytes written on success, -1 on error (errno set)
void sys_write(unsigned int fd, const char* buf, size_t count)
int sys_write(unsigned int fd, const char* buf, size_t count)
{
switch (fd) {
case 1: //stdout
for (size_t i=0; i<count; i++) {
internal_putc(buf[i], NULL);
}
break;
case 2: //stderr
for (size_t i=0; i<count; i++) {
internal_putc(buf[i], NULL);
}
break;
return count;
default:
return -EBADFD;
}
}
void sys_exit(int error_code)
int sys_exit(int error_code)
{
current_process->status = DEAD;
DEBUG("exiting process PID=%u name=%s", current_process->pid, current_process->name);
DEBUG("(pid=%u, name=%s)", current_process->pid, current_process->name);
return error_code;
}
/*
@@ -125,29 +125,36 @@ void sys_exit(int error_code)
*/
struct cpu_status* syscall_handler(struct cpu_status* regs)
{
DEBUG("Syscall %lx with (arg0=%lx arg1=%lx)", regs->rax, regs->rdi, regs->rsi);
switch (regs->rax)
{
case 0: //sys_read
case 0:
DEBUG("sys_read(fd=%u, buf=%p, count=%u)", regs->rdi, regs->rsi, regs->rdx);
regs->rax = sys_read(regs->rdi, (char*)regs->rsi, regs->rdx);
break;
case 1: //sys_write
sys_write(regs->rdi, (char*)regs->rsi, regs->rdx);
case 1:
DEBUG("sys_write(fd=%u, buf=%p, count=%u)", regs->rdi, regs->rsi, regs->rdx);
regs->rax = sys_write(regs->rdi, (char*)regs->rsi, regs->rdx);
break;
case 2:
DEBUG("sys_open(filename=%s, flags=%u)", regs->rdi, regs->rsi);
regs->rax = sys_open((const char*)regs->rdi, regs->rsi);
break;
case 3:
DEBUG("sys_close(fd=%u)", regs->rdi);
regs->rax = sys_close(regs->rdi);
break;
case 60: //sys_exit
sys_exit(regs->rdi);
case 60:
DEBUG("sys_exit(error_code=%d)", regs->rdi);
regs->rax = sys_exit(regs->rdi);
break;
default: // bad syscall
default:
DEBUG("Bad syscall! (rax=%p, rdi=%p, rsi=%p, rdx=%p)",
regs->rax, regs->rdi, regs->rsi, regs->rdx);
regs->rax = 0xbad515ca11;
break;
}
DEBUG("returned rax=%p (%u)", regs->rax, regs->rax);
return regs;
}