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glib-aux: add nm_sd_notify() helper

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Reimplements systemd's sd_notify(). We want to notify, but we don't
want to link with libsystemd.
This commit is contained in:
Thomas Haller 2021-08-02 21:56:39 +02:00
parent 5e658530ab
commit b87d7a8b40
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GPG key ID: 29C2366E4DFC5728
2 changed files with 50 additions and 0 deletions
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48
src/libnm-glib-aux/nm-io-utils.c
View file

@ -675,3 +675,51 @@ nm_io_sockaddr_un_set(struct sockaddr_un *ret, NMOptionBool is_abstract, const c
* calculated the same. */
return (nm_offsetof(struct sockaddr_un, sun_path) + 1) + l;
}
/*****************************************************************************/
/* taken from systemd's sd_notify(). */
int
nm_sd_notify(const char *state)
{
struct sockaddr_un sockaddr;
struct iovec iovec;
struct msghdr msghdr = {
.msg_iov = &iovec,
.msg_iovlen = 1,
.msg_name = &sockaddr,
};
nm_auto_close int fd = -1;
const char * e;
int r;
if (!state)
g_return_val_if_reached(-EINVAL);
e = getenv("NOTIFY_SOCKET");
if (!e)
return 0;
r = nm_io_sockaddr_un_set(&sockaddr, NM_OPTION_BOOL_DEFAULT, e);
if (r < 0)
return r;
msghdr.msg_namelen = r;
fd = socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
if (fd < 0)
return -NM_ERRNO_NATIVE(errno);
/* systemd calls here fd_set_sndbuf(fd, SNDBUF_SIZE) .We don't bother. */
iovec = (struct iovec){
.iov_base = (gpointer) state,
.iov_len = strlen(state),
};
/* systemd sends ucred, if geteuid()/getegid() does not match getuid()/getgid(). We don't bother. */
if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) < 0)
return -NM_ERRNO_NATIVE(errno);
return 0;
}

2
src/libnm-glib-aux/nm-io-utils.h
View file

@ -75,4 +75,6 @@ struct sockaddr_un;
int nm_io_sockaddr_un_set(struct sockaddr_un *ret, NMOptionBool is_abstract, const char *path);
int nm_sd_notify(const char *state);
#endif /* __NM_IO_UTILS_H__ */