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Add fcntl() F_DUPFD which is slightly different from dup2().

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This commit is contained in:
Andreas Kling 2018-11-16 22:14:40 +01:00
parent 6cedb88153
commit 2cf477a151
3 changed files with 22 additions and 0 deletions
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16
Kernel/Process.cpp
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@ -1090,6 +1090,22 @@ int Process::sys$fcntl(int fd, int cmd, dword arg)
// NOTE: The FD flags are not shared between FileDescriptor objects.
// This means that dup() doesn't copy the FD_CLOEXEC flag!
switch (cmd) {
case F_DUPFD: {
int arg_fd = (int)arg;
if (arg_fd < 0)
return -EINVAL;
int new_fd = -1;
for (int i = arg_fd; i < (int)m_max_open_file_descriptors; ++i) {
if (!m_fds[i]) {
new_fd = i;
break;
}
}
if (new_fd == -1)
return -EMFILE;
m_fds[new_fd].set(descriptor);
break;
}
case F_GETFD:
return m_fds[fd].flags;
case F_SETFD: