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author | Michal Privoznik <mprivozn@redhat.com> | 2020-06-22 20:19:35 +0200 |
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committer | Michael Roth <mdroth@linux.vnet.ibm.com> | 2020-07-13 17:44:58 -0500 |
commit | e47f4765afcab2b78dfa5b0115abf64d1d49a5d3 (patch) | |
tree | 742e33d46437b3f323f14290732020d1e9df05d0 /util/oslib-posix.c | |
parent | 844bd70b5652f30bbace89499f513e3fbbb6457a (diff) | |
download | qemu-e47f4765afcab2b78dfa5b0115abf64d1d49a5d3.zip qemu-e47f4765afcab2b78dfa5b0115abf64d1d49a5d3.tar.gz qemu-e47f4765afcab2b78dfa5b0115abf64d1d49a5d3.tar.bz2 |
util: Introduce qemu_get_host_name()
This function offers operating system agnostic way to fetch host
name. It is implemented for both POSIX-like and Windows systems.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Diffstat (limited to 'util/oslib-posix.c')
-rw-r--r-- | util/oslib-posix.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/util/oslib-posix.c b/util/oslib-posix.c index 72907d4..e60aea8 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -794,3 +794,38 @@ void sigaction_invoke(struct sigaction *action, } action->sa_sigaction(info->ssi_signo, &si, NULL); } + +#ifndef HOST_NAME_MAX +# ifdef _POSIX_HOST_NAME_MAX +# define HOST_NAME_MAX _POSIX_HOST_NAME_MAX +# else +# define HOST_NAME_MAX 255 +# endif +#endif + +char *qemu_get_host_name(Error **errp) +{ + long len = -1; + g_autofree char *hostname = NULL; + +#ifdef _SC_HOST_NAME_MAX + len = sysconf(_SC_HOST_NAME_MAX); +#endif /* _SC_HOST_NAME_MAX */ + + if (len < 0) { + len = HOST_NAME_MAX; + } + + /* Unfortunately, gethostname() below does not guarantee a + * NULL terminated string. Therefore, allocate one byte more + * to be sure. */ + hostname = g_new0(char, len + 1); + + if (gethostname(hostname, len) < 0) { + error_setg_errno(errp, errno, + "cannot get hostname"); + return NULL; + } + + return g_steal_pointer(&hostname); +} |