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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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2
libc/calls/dup-nt.c
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@ -82,6 +82,8 @@ static textwindows int sys_dup_nt_impl(int oldfd, int newfd, int flags,
g_fds.p[newfd] = g_fds.p[oldfd];
g_fds.p[newfd].handle = handle;
g_fds.p[newfd].isdup = true;
g_fds.p[oldfd].isdup = true; // TODO(jart): is it possible to avoid leak?
if (flags & _O_CLOEXEC) {
g_fds.p[newfd].flags |= _O_CLOEXEC;
} else {