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path: root/src/libsystemd/sd-bus/sd-memfd.c
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Diffstat (limited to 'src/libsystemd/sd-bus/sd-memfd.c')
-rw-r--r--src/libsystemd/sd-bus/sd-memfd.c117
1 files changed, 108 insertions, 9 deletions
diff --git a/src/libsystemd/sd-bus/sd-memfd.c b/src/libsystemd/sd-bus/sd-memfd.c
index 112c95fb43..913be2086a 100644
--- a/src/libsystemd/sd-bus/sd-memfd.c
+++ b/src/libsystemd/sd-bus/sd-memfd.c
@@ -23,22 +23,26 @@
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
+#include <sys/prctl.h>
#include "util.h"
#include "kdbus.h"
#include "sd-memfd.h"
+#include "sd-bus.h"
struct sd_memfd {
int fd;
FILE *f;
};
-_public_ int sd_memfd_new(sd_memfd **m) {
- struct kdbus_cmd_memfd_make cmd = {
- .size = sizeof(struct kdbus_cmd_memfd_make),
- };
+_public_ int sd_memfd_new(const char *name, sd_memfd **m) {
+
+ struct kdbus_cmd_memfd_make *cmd;
+ struct kdbus_item *item;
_cleanup_close_ int kdbus = -1;
+ _cleanup_free_ char *g = NULL;
+ size_t sz, l;
sd_memfd *n;
assert_return(m, -EINVAL);
@@ -47,16 +51,64 @@ _public_ int sd_memfd_new(sd_memfd **m) {
if (kdbus < 0)
return -errno;
- if (ioctl(kdbus, KDBUS_CMD_MEMFD_NEW, &cmd) < 0)
+ if (name) {
+ /* The kernel side is pretty picky about the character
+ * set here, let's do the usual bus escaping to deal
+ * with that. */
+
+ g = sd_bus_label_escape(name);
+ if (!g)
+ return -ENOMEM;
+
+ name = g;
+
+ } else {
+ char pr[17] = {};
+
+ /* If no name is specified we generate one. We include
+ * a hint indicating our library implementation, and
+ * add the thread name to it */
+
+ assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0);
+
+ if (isempty(pr))
+ name = "sd";
+ else {
+ _cleanup_free_ char *e = NULL;
+
+ e = sd_bus_label_escape(pr);
+ if (!e)
+ return -ENOMEM;
+
+ g = strappend("sd-", e);
+ if (!g)
+ return -ENOMEM;
+
+ name = g;
+ }
+ }
+
+ l = strlen(name);
+ sz = ALIGN8(offsetof(struct kdbus_cmd_memfd_make, items)) +
+ ALIGN8(offsetof(struct kdbus_item, str)) +
+ l + 1;
+ cmd = alloca0(sz);
+ cmd->size = sz;
+ item = cmd->items;
+ item->size = ALIGN8(offsetof(struct kdbus_item, str)) + l + 1;
+ item->type = KDBUS_ITEM_MEMFD_NAME;
+ memcpy(item->str, name, l + 1);
+
+ if (ioctl(kdbus, KDBUS_CMD_MEMFD_NEW, cmd) < 0)
return -errno;
n = new0(struct sd_memfd, 1);
if (!n) {
- close_nointr_nofail(cmd.fd);
+ close_nointr_nofail(cmd->fd);
return -ENOMEM;
}
- n->fd = cmd.fd;
+ n->fd = cmd->fd;
*m = n;
return 0;
}
@@ -195,11 +247,11 @@ _public_ int sd_memfd_set_size(sd_memfd *m, uint64_t sz) {
return r;
}
-_public_ int sd_memfd_new_and_map(sd_memfd **m, size_t sz, void **p) {
+_public_ int sd_memfd_new_and_map(const char *name, sd_memfd **m, size_t sz, void **p) {
sd_memfd *n;
int r;
- r = sd_memfd_new(&n);
+ r = sd_memfd_new(name, &n);
if (r < 0)
return r;
@@ -218,3 +270,50 @@ _public_ int sd_memfd_new_and_map(sd_memfd **m, size_t sz, void **p) {
*m = n;
return 0;
}
+
+_public_ int sd_memfd_get_name(sd_memfd *m, char **name) {
+ char path[sizeof("/proc/self/fd/") + DECIMAL_STR_MAX(int)], buf[FILENAME_MAX+1], *e;
+ const char *delim, *end;
+ _cleanup_free_ char *n = NULL;
+ ssize_t k;
+
+ assert_return(m, -EINVAL);
+ assert_return(name, -EINVAL);
+
+ sprintf(path, "/proc/self/fd/%i", m->fd);
+
+ k = readlink(path, buf, sizeof(buf));
+ if (k < 0)
+ return -errno;
+
+ if ((size_t) k >= sizeof(buf))
+ return -E2BIG;
+
+ buf[k] = 0;
+
+ delim = strstr(buf, ":[");
+ if (!delim)
+ return -EIO;
+
+ delim = strchr(delim + 2, ':');
+ if (!delim)
+ return -EIO;
+
+ delim++;
+
+ end = strchr(delim, ']');
+ if (!end)
+ return -EIO;
+
+ n = strndup(delim, end - delim);
+ if (!n)
+ return -ENOMEM;
+
+ e = sd_bus_label_unescape(n);
+ if (!e)
+ return -ENOMEM;
+
+ *name = e;
+
+ return 0;
+}