util: don't block on getrandom()

[elogind.git] / src / shared / missing.h

diff --git a/src/shared/missing.h b/src/shared/missing.h
index 031fe2d1ce2fd00fe91ef24731f192d0ddada53d..7725e4729803e9ed8c7c26561652f4bc918755a7 100644 (file)
--- a/src/shared/missing.h
+++ b/src/shared/missing.h
@@ -65,25 +65,11 @@
 
 #ifndef F_ADD_SEALS
 #define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
-#endif
-
-#ifndef F_GET_SEALS
 #define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
-#endif
 
-#ifndef F_SEAL_SEAL
 #define F_SEAL_SEAL     0x0001  /* prevent further seals from being set */
-#endif
-
-#ifndef F_SEAL_SHRINK
 #define F_SEAL_SHRINK   0x0002  /* prevent file from shrinking */
-#endif
-
-#ifndef F_SEAL_GROW
 #define F_SEAL_GROW     0x0004  /* prevent file from growing */
-#endif
-
-#ifndef F_SEAL_WRITE
 #define F_SEAL_WRITE    0x0008  /* prevent writes */
 #endif
 
@@ -129,88 +115,46 @@ static inline int pivot_root(const char *new_root, const char *put_old) {
 }
 #endif
 
-#ifdef __x86_64__
-#  ifndef __NR_fanotify_init
-#    define __NR_fanotify_init 300
-#  endif
-#  ifndef __NR_fanotify_mark
-#    define __NR_fanotify_mark 301
-#  endif
-#  ifndef __NR_memfd_create
+#ifndef __NR_memfd_create
+#  if defined __x86_64__
 #    define __NR_memfd_create 319
-#  endif
-#elif defined __arm__
-#  ifndef __NR_memfd_create
+#  elif defined __arm__
 #    define __NR_memfd_create 385
-#  endif
-#elif defined _MIPS_SIM
-#  if _MIPS_SIM == _MIPS_SIM_ABI32
-#    ifndef __NR_fanotify_init
-#      define __NR_fanotify_init 4336
-#    endif
-#    ifndef __NR_fanotify_mark
-#      define __NR_fanotify_mark 4337
-#    endif
-#  elif _MIPS_SIM == _MIPS_SIM_NABI32
-#    ifndef __NR_fanotify_init
-#      define __NR_fanotify_init 6300
-#    endif
-#    ifndef __NR_fanotify_mark
-#      define __NR_fanotify_mark 6301
-#    endif
-#  elif _MIPS_SIM == _MIPS_SIM_ABI64
-#    ifndef __NR_fanotify_init
-#      define __NR_fanotify_init 5295
-#    endif
-#    ifndef __NR_fanotify_mark
-#      define __NR_fanotify_mark 5296
-#    endif
-#  endif
-#  ifndef __NR_memfd_create
+#  elif defined _MIPS_SIM
 #    warning "__NR_memfd_create not yet defined for MIPS"
 #    define __NR_memfd_create 0xffffffff
-#  endif
-#else
-#  ifndef __NR_fanotify_init
-#    define __NR_fanotify_init 338
-#  endif
-#  ifndef __NR_fanotify_mark
-#    define __NR_fanotify_mark 339
-#  endif
-#  ifndef __NR_memfd_create
+#  else
 #    define __NR_memfd_create 356
 #  endif
 #endif
 
-#ifndef HAVE_FANOTIFY_INIT
-static inline int fanotify_init(unsigned int flags, unsigned int event_f_flags) {
-        return syscall(__NR_fanotify_init, flags, event_f_flags);
+#ifndef HAVE_MEMFD_CREATE
+static inline int memfd_create(const char *name, unsigned int flags) {
+        return syscall(__NR_memfd_create, name, flags);
 }
 #endif
 
-#ifndef HAVE_FANOTIFY_MARK
-static inline int fanotify_mark(int fanotify_fd, unsigned int flags, uint64_t mask,
-                                int dfd, const char *pathname) {
-#if defined _MIPS_SIM && _MIPS_SIM == _MIPS_SIM_ABI32 || defined __powerpc__ && !defined __powerpc64__ \
-    || defined __arm__ && !defined __aarch64__
-        union {
-                uint64_t _64;
-                uint32_t _32[2];
-        } _mask;
-        _mask._64 = mask;
-
-        return syscall(__NR_fanotify_mark, fanotify_fd, flags,
-                       _mask._32[0], _mask._32[1], dfd, pathname);
-#else
-        return syscall(__NR_fanotify_mark, fanotify_fd, flags, mask, dfd, pathname);
+#ifndef __NR_getrandom
+#  if defined __x86_64__
+#    define __NR_getrandom 318
+#  else
+#    warning "__NR_getrandom unknown for your architecture"
+#    define __NR_getrandom 0xffffffff
+#  endif
 #endif
+
+#if !HAVE_DECL_GETRANDOM
+static inline int getrandom(void *buffer, size_t count, unsigned flags) {
+        return syscall(__NR_getrandom, buffer, count, flags);
 }
 #endif
 
-#ifndef HAVE_MEMFD_CREATE
-static inline int memfd_create(const char *name, unsigned int flags) {
-        return syscall(__NR_memfd_create, name, flags);
-}
+#ifndef GRND_NONBLOCK
+#define GRND_NONBLOCK 0x0001
+#endif
+
+#ifndef GRND_RANDOM
+#define GRND_RANDOM 0x0002
 #endif
 
 #ifndef BTRFS_IOCTL_MAGIC
@@ -484,7 +428,7 @@ static inline int setns(int fd, int nstype) {
 #define IFLA_BOND_AD_INFO 23
 #define __IFLA_BOND_MAX 24
 
-#define IFLA_BOND_MAX  (__IFLA_BOND_MAX - 1)
+#define IFLA_BOND_MAX   (__IFLA_BOND_MAX - 1)
 #endif
 
 #if !HAVE_DECL_IFLA_VLAN_PROTOCOL
@@ -600,3 +544,12 @@ static inline int setns(int fd, int nstype) {
 #ifndef BPF_XOR
 #  define BPF_XOR 0xa0
 #endif
+
+/* Note that LOOPBACK_IFINDEX is currently not exported by the
+ * kernel/glibc, but hardcoded internally by the kernel.  However, as
+ * it is exported to userspace indirectly via rtnetlink and the
+ * ioctls, and made use of widely we define it here too, in a way that
+ * is compatible with the kernel's internal definition. */
+#ifndef LOOPBACK_IFINDEX
+#define LOOPBACK_IFINDEX 1
+#endif