24c736b0e7
While I was updating syscalls to stop passing null-terminated strings,
I added some helpful struct types:
- StringArgument { const char*; size_t; }
- ImmutableBuffer<Data, Size> { const Data*; Size; }
- MutableBuffer<Data, Size> { Data*; Size; }
The Process class has some convenience functions for validating and
optionally extracting the contents from these structs:
- get_syscall_path_argument(StringArgument)
- validate_and_copy_string_from_user(StringArgument)
- validate(ImmutableBuffer)
- validate(MutableBuffer)
There's still so much code around this and I'm wondering if we should
generate most of it instead. Possible nice little project.
53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
#include <Kernel/Syscall.h>
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#include <errno.h>
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#include <mman.h>
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#include <stdio.h>
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#include <string.h>
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extern "C" {
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void* mmap(void* addr, size_t size, int prot, int flags, int fd, off_t offset)
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{
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return mmap_with_name(addr, size, prot, flags, fd, offset, nullptr);
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}
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void* mmap_with_name(void* addr, size_t size, int prot, int flags, int fd, off_t offset, const char* name)
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{
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Syscall::SC_mmap_params params { (u32)addr, size, prot, flags, fd, offset, { name, name ? strlen(name) : 0 } };
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int rc = syscall(SC_mmap, ¶ms);
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if (rc < 0 && -rc < EMAXERRNO) {
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errno = -rc;
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return MAP_FAILED;
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}
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return (void*)rc;
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}
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int munmap(void* addr, size_t size)
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{
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int rc = syscall(SC_munmap, addr, size);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int mprotect(void* addr, size_t size, int prot)
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{
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int rc = syscall(SC_mprotect, addr, size, prot);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int set_mmap_name(void* addr, size_t size, const char* name)
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{
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if (!name) {
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errno = EFAULT;
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return -1;
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}
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Syscall::SC_set_mmap_name_params params { addr, size, { name, strlen(name) } };
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int rc = syscall(SC_set_mmap_name, ¶ms);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int madvise(void* address, size_t size, int advice)
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{
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int rc = syscall(SC_madvise, address, size, advice);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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}
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