#include <sys/mman.h>
#include <sys/prctl.h>
+#ifdef HAVE_LINUX_MEMFD_H
+# include <linux/memfd.h>
+#endif
+
#include "util.h"
#include "bus-label.h"
-#include "missing.h"
#include "memfd.h"
+#include "utf8.h"
+#include "missing.h"
-#include "sd-bus.h"
-
-struct sd_memfd {
- int fd;
- FILE *f;
-};
-
-int sd_memfd_new(sd_memfd **m, const char *name) {
-
+int memfd_new(const char *name) {
_cleanup_free_ char *g = NULL;
- sd_memfd *n;
-
- assert_return(m, -EINVAL);
-
- 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 = bus_label_escape(name);
- if (!g)
- return -ENOMEM;
-
- name = g;
+ int fd;
- } else {
+ if (!name) {
char pr[17] = {};
/* If no name is specified we generate one. We include
else {
_cleanup_free_ char *e = NULL;
- e = bus_label_escape(pr);
+ e = utf8_escape_invalid(pr);
if (!e)
return -ENOMEM;
}
}
- n = new0(struct sd_memfd, 1);
- if (!n)
- return -ENOMEM;
-
- n->fd = memfd_create(name, MFD_ALLOW_SEALING);
- if (n->fd < 0) {
- free(n);
- return -errno;
- }
-
- *m = n;
- return 0;
-}
-
-int sd_memfd_new_from_fd(sd_memfd **m, int fd) {
- sd_memfd *n;
-
- assert_return(m, -EINVAL);
- assert_return(fd >= 0, -EINVAL);
-
- /* Check if this is a sealable fd */
- if (fcntl(fd, F_GET_SEALS) < 0)
- return -ENOTTY;
-
- n = new0(struct sd_memfd, 1);
- if (!n)
- return -ENOMEM;
-
- n->fd = fd;
- *m = n;
-
- return 0;
-}
-
-void sd_memfd_free(sd_memfd *m) {
- if (!m)
- return;
-
- if (m->f)
- fclose(m->f);
- else
- safe_close(m->fd);
-
- free(m);
-}
-
-int sd_memfd_get_fd(sd_memfd *m) {
- assert_return(m, -EINVAL);
-
- return m->fd;
-}
-
-int sd_memfd_get_file(sd_memfd *m, FILE **f) {
- assert_return(m, -EINVAL);
- assert_return(f, -EINVAL);
-
- if (!m->f) {
- m->f = fdopen(m->fd, "r+");
- if (!m->f)
- return -errno;
- }
-
- *f = m->f;
- return 0;
-}
-
-int sd_memfd_dup_fd(sd_memfd *m) {
- int fd;
-
- assert_return(m, -EINVAL);
-
- fd = fcntl(m->fd, F_DUPFD_CLOEXEC, 3);
+ fd = memfd_create(name, MFD_ALLOW_SEALING | MFD_CLOEXEC);
if (fd < 0)
return -errno;
return fd;
}
-int sd_memfd_map(sd_memfd *m, uint64_t offset, size_t size, void **p) {
+int memfd_map(int fd, uint64_t offset, size_t size, void **p) {
void *q;
int sealed;
- assert_return(m, -EINVAL);
- assert_return(size > 0, -EINVAL);
- assert_return(p, -EINVAL);
+ assert(fd >= 0);
+ assert(size > 0);
+ assert(p);
- sealed = sd_memfd_get_sealed(m);
+ sealed = memfd_get_sealed(fd);
if (sealed < 0)
return sealed;
- q = mmap(NULL, size, sealed ? PROT_READ : PROT_READ|PROT_WRITE, MAP_PRIVATE, m->fd, offset);
+ if (sealed)
+ q = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, offset);
+ else
+ q = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset);
+
if (q == MAP_FAILED)
return -errno;
return 0;
}
-int sd_memfd_set_sealed(sd_memfd *m) {
+int memfd_set_sealed(int fd) {
int r;
- assert_return(m, -EINVAL);
+ assert(fd >= 0);
- r = fcntl(m->fd, F_ADD_SEALS, F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE);
+ r = fcntl(fd, F_ADD_SEALS, F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE);
if (r < 0)
return -errno;
return 0;
}
-int sd_memfd_get_sealed(sd_memfd *m) {
+int memfd_get_sealed(int fd) {
int r;
- assert_return(m, -EINVAL);
+ assert(fd >= 0);
- r = fcntl(m->fd, F_GET_SEALS);
+ r = fcntl(fd, F_GET_SEALS);
if (r < 0)
return -errno;
(F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE);
}
-int sd_memfd_get_size(sd_memfd *m, uint64_t *sz) {
- int r;
+int memfd_get_size(int fd, uint64_t *sz) {
struct stat stat;
+ int r;
- assert_return(m, -EINVAL);
- assert_return(sz, -EINVAL);
+ assert(fd >= 0);
+ assert(sz);
- r = fstat(m->fd, &stat);
+ r = fstat(fd, &stat);
if (r < 0)
return -errno;
*sz = stat.st_size;
- return r;
+ return 0;
}
-int sd_memfd_set_size(sd_memfd *m, uint64_t sz) {
+int memfd_set_size(int fd, uint64_t sz) {
int r;
- assert_return(m, -EINVAL);
+ assert(fd >= 0);
- r = ftruncate(m->fd, sz);
+ r = ftruncate(fd, sz);
if (r < 0)
return -errno;
- return r;
+ return 0;
}
-int sd_memfd_new_and_map(sd_memfd **m, const char *name, size_t sz, void **p) {
- sd_memfd *n;
+int memfd_new_and_map(const char *name, size_t sz, void **p) {
+ _cleanup_close_ int fd = -1;
int r;
- r = sd_memfd_new(&n, name);
- if (r < 0)
- return r;
+ assert(sz > 0);
+ assert(p);
- r = sd_memfd_set_size(n, sz);
- if (r < 0) {
- sd_memfd_free(n);
- return r;
- }
+ fd = memfd_new(name);
+ if (fd < 0)
+ return fd;
- r = sd_memfd_map(n, 0, sz, p);
- if (r < 0) {
- sd_memfd_free(n);
+ r = memfd_set_size(fd, sz);
+ if (r < 0)
return r;
- }
- *m = n;
- return 0;
-}
-
-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 = bus_label_unescape(n);
- if (!e)
- return -ENOMEM;
+ r = memfd_map(fd, 0, sz, p);
+ if (r < 0)
+ return r;
- *name = e;
+ r = fd;
+ fd = -1;
- return 0;
+ return r;
}
~ianmdlvl / elogind.git / blobdiff