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Share file offset across processes

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This change ensures that if a file descriptor for an open disk file gets
shared by multiple processes within a process tree, then lseek() changes
will be visible across processes, and read() / write() are synchronized.
Note this only applies to Windows, because UNIX kernels already do this.
This commit is contained in:
Justine Tunney 2024-08-03 01:24:46 -07:00
parent a80ab3f8fe
commit 761c6ad615
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GPG key ID: BE714B4575D6E328
15 changed files with 256 additions and 63 deletions
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5
libc/calls/close-nt.c
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@ -17,13 +17,14 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/internal.h"
#include "libc/intrin/fds.h"
#include "libc/calls/syscall-nt.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/intrin/fds.h"
#include "libc/intrin/weaken.h"
#include "libc/nt/enum/filetype.h"
#include "libc/nt/files.h"
#include "libc/nt/runtime.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/zipos.internal.h"
#include "libc/sock/syscall_fd.internal.h"
#include "libc/sysv/consts/o.h"
@ -64,5 +65,7 @@ textwindows int sys_close_nt(int fd, int fildes) {
default:
break;
}
if (f->shared && !f->isdup)
munmap(f->shared, sizeof(struct Cursor));
return CloseHandle(f->handle) ? 0 : __winerr();
}