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-rw-r--r--src/basic/errno-util.h176
1 files changed, 176 insertions, 0 deletions
diff --git a/src/basic/errno-util.h b/src/basic/errno-util.h
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--- /dev/null
+++ b/src/basic/errno-util.h
@@ -0,0 +1,176 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "macro.h"
+
+/* strerror(3) says that glibc uses a maximum length of 1024 bytes. */
+#define ERRNO_BUF_LEN 1024
+
+/* Note: the lifetime of the compound literal is the immediately surrounding block,
+ * see C11 §6.5.2.5, and
+ * https://stackoverflow.com/questions/34880638/compound-literal-lifetime-and-if-blocks
+ *
+ * Note that we use the GNU variant of strerror_r() here. */
+#define STRERROR(errnum) strerror_r(abs(errnum), (char[ERRNO_BUF_LEN]){}, ERRNO_BUF_LEN)
+
+/* A helper to print an error message or message for functions that return 0 on EOF.
+ * Note that we can't use ({ … }) to define a temporary variable, so errnum is
+ * evaluated twice. */
+#define STRERROR_OR_EOF(errnum) ((errnum) != 0 ? STRERROR(errnum) : "Unexpected EOF")
+
+static inline void _reset_errno_(int *saved_errno) {
+ if (*saved_errno < 0) /* Invalidated by UNPROTECT_ERRNO? */
+ return;
+
+ errno = *saved_errno;
+}
+
+#define PROTECT_ERRNO \
+ _cleanup_(_reset_errno_) _unused_ int _saved_errno_ = errno
+
+#define UNPROTECT_ERRNO \
+ do { \
+ errno = _saved_errno_; \
+ _saved_errno_ = -1; \
+ } while (false)
+
+#define LOCAL_ERRNO(value) \
+ PROTECT_ERRNO; \
+ errno = abs(value)
+
+static inline int negative_errno(void) {
+ /* This helper should be used to shut up gcc if you know 'errno' is
+ * negative. Instead of "return -errno;", use "return negative_errno();"
+ * It will suppress bogus gcc warnings in case it assumes 'errno' might
+ * be 0 and thus the caller's error-handling might not be triggered. */
+ assert_return(errno > 0, -EINVAL);
+ return -errno;
+}
+
+static inline int RET_NERRNO(int ret) {
+
+ /* Helper to wrap system calls in to make them return negative errno errors. This brings system call
+ * error handling in sync with how we usually handle errors in our own code, i.e. with immediate
+ * returning of negative errno. Usage is like this:
+ *
+ * …
+ * r = RET_NERRNO(unlink(t));
+ * …
+ *
+ * or
+ *
+ * …
+ * fd = RET_NERRNO(open("/etc/fstab", O_RDONLY|O_CLOEXEC));
+ * …
+ */
+
+ if (ret < 0)
+ return negative_errno();
+
+ return ret;
+}
+
+static inline int errno_or_else(int fallback) {
+ /* To be used when invoking library calls where errno handling is not defined clearly: we return
+ * errno if it is set, and the specified error otherwise. The idea is that the caller initializes
+ * errno to zero before doing an API call, and then uses this helper to retrieve a somewhat useful
+ * error code */
+ if (errno > 0)
+ return -errno;
+
+ return -abs(fallback);
+}
+
+/* For send()/recv() or read()/write(). */
+static inline bool ERRNO_IS_TRANSIENT(int r) {
+ return IN_SET(abs(r),
+ EAGAIN,
+ EINTR);
+}
+
+/* Hint #1: ENETUNREACH happens if we try to connect to "non-existing" special IP addresses, such as ::5.
+ *
+ * Hint #2: The kernel sends e.g., EHOSTUNREACH or ENONET to userspace in some ICMP error cases. See the
+ * icmp_err_convert[] in net/ipv4/icmp.c in the kernel sources.
+ *
+ * Hint #3: When asynchronous connect() on TCP fails because the host never acknowledges a single packet,
+ * kernel tells us that with ETIMEDOUT, see tcp(7). */
+static inline bool ERRNO_IS_DISCONNECT(int r) {
+ return IN_SET(abs(r),
+ ECONNABORTED,
+ ECONNREFUSED,
+ ECONNRESET,
+ EHOSTDOWN,
+ EHOSTUNREACH,
+ ENETDOWN,
+ ENETRESET,
+ ENETUNREACH,
+ ENONET,
+ ENOPROTOOPT,
+ ENOTCONN,
+ EPIPE,
+ EPROTO,
+ ESHUTDOWN,
+ ETIMEDOUT);
+}
+
+/* Transient errors we might get on accept() that we should ignore. As per error handling comment in
+ * the accept(2) man page. */
+static inline bool ERRNO_IS_ACCEPT_AGAIN(int r) {
+ return ERRNO_IS_DISCONNECT(r) ||
+ ERRNO_IS_TRANSIENT(r) ||
+ abs(r) == EOPNOTSUPP;
+}
+
+/* Resource exhaustion, could be our fault or general system trouble */
+static inline bool ERRNO_IS_RESOURCE(int r) {
+ return IN_SET(abs(r),
+ EMFILE,
+ ENFILE,
+ ENOMEM);
+}
+
+/* Seven different errors for "operation/system call/ioctl/socket feature not supported" */
+static inline bool ERRNO_IS_NOT_SUPPORTED(int r) {
+ return IN_SET(abs(r),
+ EOPNOTSUPP,
+ ENOTTY,
+ ENOSYS,
+ EAFNOSUPPORT,
+ EPFNOSUPPORT,
+ EPROTONOSUPPORT,
+ ESOCKTNOSUPPORT);
+}
+
+/* Two different errors for access problems */
+static inline bool ERRNO_IS_PRIVILEGE(int r) {
+ return IN_SET(abs(r),
+ EACCES,
+ EPERM);
+}
+
+/* Three different errors for "not enough disk space" */
+static inline bool ERRNO_IS_DISK_SPACE(int r) {
+ return IN_SET(abs(r),
+ ENOSPC,
+ EDQUOT,
+ EFBIG);
+}
+
+/* Three different errors for "this device does not quite exist" */
+static inline bool ERRNO_IS_DEVICE_ABSENT(int r) {
+ return IN_SET(abs(r),
+ ENODEV,
+ ENXIO,
+ ENOENT);
+}
+
+/* Quite often we want to handle cases where the backing FS doesn't support extended attributes at all and
+ * where it simply doesn't have the requested xattr the same way */
+static inline bool ERRNO_IS_XATTR_ABSENT(int r) {
+ return abs(r) == ENODATA ||
+ ERRNO_IS_NOT_SUPPORTED(r);
+}