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gio-unix: Use EPOLL_CLOEXEC by default

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First, there's no reason not to use the new `epoll_create1` system call,
which quickly obsoleted `epoll_create` which has an obsolete and
unused size argument.

But more specifically, it offers `EPOLL_CLOEXEC` which we want
to use for general hygeine - there's no reason to potentially
leak this file descriptor to forked processes.

(GLib itself carefully closes file descriptors when forking child
 processes, but it may be linked with other software that doesn't;
 notably in my case for example the Rust standard library does not
 do this and hence relies more on the application code using
 `O_CLOEXEC` and variants)

This is just a drive-by fix; I saw the system call when I was using
`strace` to debug something else in rpm-ostree.
This commit is contained in:
Colin Walters 2022-08-26 04:05:40 -04:00
parent c135882e7e
commit 426fab1eca
1 changed files with 2 additions and 2 deletions
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4
gio/giounix-private.c
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@ -82,9 +82,9 @@ _g_fd_is_pollable (int fd)
struct epoll_event ev = { 0, }; struct epoll_event ev = { 0, };
gboolean add_succeeded; gboolean add_succeeded;
efd = epoll_create (1); efd = epoll_create1 (EPOLL_CLOEXEC);
if (efd == -1) if (efd == -1)
g_error ("epoll_create () failed: %s", g_strerror (errno)); g_error ("epoll_create1 () failed: %s", g_strerror (errno));
ev.events = EPOLLIN; ev.events = EPOLLIN;