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https://github.com/checkpoint-restore/criu
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a434e7f075
crtools.h is too heavy to be included in many sources Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
75 lines
1.3 KiB
C
75 lines
1.3 KiB
C
#include <unistd.h>
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#include <fcntl.h>
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#include <sys/utsname.h>
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#include <string.h>
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#include "util.h"
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#include "syscall.h"
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#include "namespaces.h"
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#include "sysctl.h"
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#include "uts_ns.h"
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#include "protobuf.h"
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#include "protobuf/utsns.pb-c.h"
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int dump_uts_ns(int ns_pid, int ns_id)
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{
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int ret, img_fd;
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struct utsname ubuf;
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UtsnsEntry ue = UTSNS_ENTRY__INIT;
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img_fd = open_image(CR_FD_UTSNS, O_DUMP, ns_id);
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if (img_fd < 0)
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return -1;
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ret = switch_ns(ns_pid, &uts_ns_desc, NULL);
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if (ret < 0)
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goto err;
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ret = uname(&ubuf);
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if (ret < 0) {
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pr_perror("Error calling uname");
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goto err;
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}
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ue.nodename = ubuf.nodename;
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ue.domainname = ubuf.domainname;
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ret = pb_write_one(img_fd, &ue, PB_UTSNS);
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err:
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close(img_fd);
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return ret < 0 ? -1 : 0;
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}
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int prepare_utsns(int pid)
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{
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int fd, ret;
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UtsnsEntry *ue;
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struct sysctl_req req[3] = {
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{ "kernel/hostname" },
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{ "kernel/domainname" },
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{ },
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};
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fd = open_image(CR_FD_UTSNS, O_RSTR, pid);
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if (fd < 0)
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return -1;
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ret = pb_read_one(fd, &ue, PB_UTSNS);
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if (ret < 0)
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goto out;
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req[0].arg = ue->nodename;
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req[0].type = CTL_STR(strlen(ue->nodename));
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req[1].arg = ue->domainname;
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req[1].type = CTL_STR(strlen(ue->domainname));
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ret = sysctl_op(req, CTL_WRITE);
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utsns_entry__free_unpacked(ue, NULL);
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out:
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close(fd);
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return ret;
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}
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struct ns_desc uts_ns_desc = NS_DESC_ENTRY(CLONE_NEWUTS, "uts");
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