io_uring_prep_symlinkat(3) liburing Manual io_uring_prep_symlinkat(3)
io_uring_prep_symlinkat - prepare a symlinkat request
#include <fcntl.h> #include <unistd.h> #include <liburing.h> void io_uring_prep_symlinkat(struct io_uring_sqe *sqe, const char *target, int newdirfd, const char *linkpath); void io_uring_prep_symlink(struct io_uring_sqe *sqe, const char *target, const char *linkpath);
The io_uring_prep_symlinkat(3) function prepares a symlinkat request. The submission queue entry sqe is setup to symlink the target path pointed to by target to the new destination indicated by newdirfd and linkpath. The io_uring_prep_symlink(3) function prepares a symlink request. The submission queue entry sqe is setup to symlink the target path pointed to by target to the new destination indicated by linkpath relative to the the current working directory. This function prepares an async symlink(2) request. See that man page for details. These functions prepare an async symlinkat(2) or symlink(2) request. See those man pages for details.
The CQE res field will contain the result of the operation. See the related man page for details on possible values. Note that where synchronous system calls will return -1 on failure and set errno to the actual error value, io_uring never uses errno. Instead it returns the negated errno directly in the CQE res field.
As with any request that passes in data in a struct, that data must remain valid until the request has been successfully submitted. It need not remain valid until completion. Once a request has been submitted, the in-kernel state is stable. Very early kernels (5.4 and earlier) required state to be stable until the completion occurred. Applications can test for this behavior by inspecting the IORING_FEAT_SUBMIT_STABLE flag passed back from io_uring_queue_init_params(3).
io_uring_get_sqe(3), io_uring_submit(3), symlinkat(2), symlink(2)
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Pages that refer to this page: io_uring_prep_symlink(3), io_uring_prep_symlinkat(3)