diff options
Diffstat (limited to 'src/nvim/os/fs.c')
| -rw-r--r-- | src/nvim/os/fs.c | 286 |
1 files changed, 234 insertions, 52 deletions
diff --git a/src/nvim/os/fs.c b/src/nvim/os/fs.c index 08122828bd..49c42cb63d 100644 --- a/src/nvim/os/fs.c +++ b/src/nvim/os/fs.c @@ -1,14 +1,26 @@ // fs.c -- filesystem access #include <stdbool.h> - +#include <stddef.h> #include <assert.h> +#include <limits.h> +#include <unistd.h> #include <fcntl.h> +#include <errno.h> + +#include "auto/config.h" + +#ifdef HAVE_SYS_UIO_H +# include <sys/uio.h> +#endif + +#include <uv.h> #include "nvim/os/os.h" #include "nvim/os/os_defs.h" #include "nvim/ascii.h" #include "nvim/memory.h" #include "nvim/message.h" +#include "nvim/assert.h" #include "nvim/misc1.h" #include "nvim/misc2.h" #include "nvim/path.h" @@ -18,6 +30,20 @@ # include "os/fs.c.generated.h" #endif +#define RUN_UV_FS_FUNC(ret, func, ...) \ + do { \ + bool did_try_to_free = false; \ +uv_call_start: {} \ + uv_fs_t req; \ + ret = func(&fs_loop, &req, __VA_ARGS__); \ + uv_fs_req_cleanup(&req); \ + if (ret == UV_ENOMEM && !did_try_to_free) { \ + try_to_free_memory(); \ + did_try_to_free = true; \ + goto uv_call_start; \ + } \ + } while (0) + // Many fs functions from libuv return that value on success. static const int kLibuvSuccess = 0; static uv_loop_t fs_loop; @@ -325,13 +351,190 @@ static bool is_executable_in_path(const char_u *name, char_u **abspath) int os_open(const char* path, int flags, int mode) FUNC_ATTR_NONNULL_ALL { - uv_fs_t open_req; - int r = uv_fs_open(&fs_loop, &open_req, path, flags, mode, NULL); - uv_fs_req_cleanup(&open_req); - // r is the same as open_req.result (except for OOM: then only r is set). + int r; + RUN_UV_FS_FUNC(r, uv_fs_open, path, flags, mode, NULL); + return r; +} + +/// Close a file +/// +/// @return 0 or libuv error code on failure. +int os_close(const int fd) +{ + int r; + RUN_UV_FS_FUNC(r, uv_fs_close, fd, NULL); return r; } +/// Read from a file +/// +/// Handles EINTR and ENOMEM, but not other errors. +/// +/// @param[in] fd File descriptor to read from. +/// @param[out] ret_eof Is set to true if EOF was encountered, otherwise set +/// to false. Initial value is ignored. +/// @param[out] ret_buf Buffer to write to. May be NULL if size is zero. +/// @param[in] size Amount of bytes to read. +/// +/// @return Number of bytes read or libuv error code (< 0). +ptrdiff_t os_read(const int fd, bool *ret_eof, char *const ret_buf, + const size_t size) + FUNC_ATTR_WARN_UNUSED_RESULT +{ + *ret_eof = false; + if (ret_buf == NULL) { + assert(size == 0); + return 0; + } + size_t read_bytes = 0; + bool did_try_to_free = false; + while (read_bytes != size) { + const ptrdiff_t cur_read_bytes = read(fd, ret_buf + read_bytes, + size - read_bytes); + if (cur_read_bytes > 0) { + read_bytes += (size_t)cur_read_bytes; + assert(read_bytes <= size); + } + if (cur_read_bytes < 0) { +#ifdef HAVE_UV_TRANSLATE_SYS_ERROR + const int error = uv_translate_sys_error(errno); +#else + const int error = -errno; + STATIC_ASSERT(-EINTR == UV_EINTR, "Need to translate error codes"); + STATIC_ASSERT(-EAGAIN == UV_EAGAIN, "Need to translate error codes"); + STATIC_ASSERT(-ENOMEM == UV_ENOMEM, "Need to translate error codes"); +#endif + errno = 0; + if (error == UV_EINTR || error == UV_EAGAIN) { + continue; + } else if (error == UV_ENOMEM && !did_try_to_free) { + try_to_free_memory(); + did_try_to_free = true; + continue; + } else { + return (ptrdiff_t)error; + } + } + if (cur_read_bytes == 0) { + *ret_eof = true; + break; + } + } + return (ptrdiff_t)read_bytes; +} + +#ifdef HAVE_READV +/// Read from a file to multiple buffers at once +/// +/// Wrapper for readv(). +/// +/// @param[in] fd File descriptor to read from. +/// @param[out] ret_eof Is set to true if EOF was encountered, otherwise set +/// to false. Initial value is ignored. +/// @param[out] iov Description of buffers to write to. Note: this description +/// may change, it is incorrect to use data it points to after +/// os_readv(). +/// @param[in] iov_size Number of buffers in iov. +ptrdiff_t os_readv(int fd, bool *ret_eof, struct iovec *iov, size_t iov_size) + FUNC_ATTR_NONNULL_ALL +{ + *ret_eof = false; + size_t read_bytes = 0; + bool did_try_to_free = false; + size_t toread = 0; + for (size_t i = 0; i < iov_size; i++) { + // Overflow, trying to read too much data + assert(toread <= SIZE_MAX - iov[i].iov_len); + toread += iov[i].iov_len; + } + while (read_bytes < toread && iov_size && !*ret_eof) { + ptrdiff_t cur_read_bytes = readv(fd, iov, (int)iov_size); + if (toread && cur_read_bytes == 0) { + *ret_eof = true; + } + if (cur_read_bytes > 0) { + read_bytes += (size_t)cur_read_bytes; + while (iov_size && cur_read_bytes) { + if (cur_read_bytes < (ptrdiff_t)iov->iov_len) { + iov->iov_len -= (size_t)cur_read_bytes; + iov->iov_base = (char *)iov->iov_base + cur_read_bytes; + cur_read_bytes = 0; + } else { + cur_read_bytes -= (ptrdiff_t)iov->iov_len; + iov_size--; + iov++; + } + } + } else if (cur_read_bytes < 0) { +#ifdef HAVE_UV_TRANSLATE_SYS_ERROR + const int error = uv_translate_sys_error(errno); +#else + const int error = -errno; + STATIC_ASSERT(-EINTR == UV_EINTR, "Need to translate error codes"); + STATIC_ASSERT(-EAGAIN == UV_EAGAIN, "Need to translate error codes"); + STATIC_ASSERT(-ENOMEM == UV_ENOMEM, "Need to translate error codes"); +#endif + errno = 0; + if (error == UV_EINTR || error == UV_EAGAIN) { + continue; + } else if (error == UV_ENOMEM && !did_try_to_free) { + try_to_free_memory(); + did_try_to_free = true; + continue; + } else { + return (ptrdiff_t)error; + } + } + } + return (ptrdiff_t)read_bytes; +} +#endif // HAVE_READV + +/// Write to a file +/// +/// @param[in] fd File descriptor to write to. +/// @param[in] buf Data to write. May be NULL if size is zero. +/// @param[in] size Amount of bytes to write. +/// +/// @return Number of bytes written or libuv error code (< 0). +ptrdiff_t os_write(const int fd, const char *const buf, const size_t size) + FUNC_ATTR_WARN_UNUSED_RESULT +{ + if (buf == NULL) { + assert(size == 0); + return 0; + } + size_t written_bytes = 0; + while (written_bytes != size) { + const ptrdiff_t cur_written_bytes = write(fd, buf + written_bytes, + size - written_bytes); + if (cur_written_bytes > 0) { + written_bytes += (size_t)cur_written_bytes; + } + if (cur_written_bytes < 0) { +#ifdef HAVE_UV_TRANSLATE_SYS_ERROR + const int error = uv_translate_sys_error(errno); +#else + const int error = -errno; + STATIC_ASSERT(-EINTR == UV_EINTR, "Need to translate error codes"); + STATIC_ASSERT(-EAGAIN == UV_EAGAIN, "Need to translate error codes"); + // According to the man page open() may fail with ENOMEM, but write() + // can’t. +#endif + errno = 0; + if (error == UV_EINTR || error == UV_EAGAIN) { + continue; + } else { + return error; + } + } + if (cur_written_bytes == 0) { + return UV_UNKNOWN; + } + } + return (ptrdiff_t)written_bytes; +} + /// Flushes file modifications to disk. /// /// @param fd the file descriptor of the file to flush to disk. @@ -339,9 +542,8 @@ int os_open(const char* path, int flags, int mode) /// @return `0` on success, a libuv error code on failure. int os_fsync(int fd) { - uv_fs_t fsync_req; - int r = uv_fs_fsync(&fs_loop, &fsync_req, fd, NULL); - uv_fs_req_cleanup(&fsync_req); + int r; + RUN_UV_FS_FUNC(r, uv_fs_fsync, fd, NULL); return r; } @@ -379,16 +581,9 @@ int32_t os_getperm(const char_u *name) int os_setperm(const char_u *name, int perm) FUNC_ATTR_NONNULL_ALL { - uv_fs_t request; - int result = uv_fs_chmod(&fs_loop, &request, - (const char*)name, perm, NULL); - uv_fs_req_cleanup(&request); - - if (result == kLibuvSuccess) { - return OK; - } - - return FAIL; + int r; + RUN_UV_FS_FUNC(r, uv_fs_chmod, (const char *)name, perm, NULL); + return (r == kLibuvSuccess ? OK : FAIL); } /// Changes the ownership of the file referred to by the open file descriptor. @@ -397,13 +592,11 @@ int os_setperm(const char_u *name, int perm) /// /// @note If the `owner` or `group` is specified as `-1`, then that ID is not /// changed. -int os_fchown(int file_descriptor, uv_uid_t owner, uv_gid_t group) +int os_fchown(int fd, uv_uid_t owner, uv_gid_t group) { - uv_fs_t request; - int result = uv_fs_fchown(&fs_loop, &request, file_descriptor, - owner, group, NULL); - uv_fs_req_cleanup(&request); - return result; + int r; + RUN_UV_FS_FUNC(r, uv_fs_fchown, fd, owner, group, NULL); + return r; } /// Check if a file exists. @@ -422,9 +615,8 @@ bool os_file_exists(const char_u *name) bool os_file_is_readable(const char *name) FUNC_ATTR_NONNULL_ALL FUNC_ATTR_WARN_UNUSED_RESULT { - uv_fs_t req; - int r = uv_fs_access(&fs_loop, &req, name, R_OK, NULL); - uv_fs_req_cleanup(&req); + int r; + RUN_UV_FS_FUNC(r, uv_fs_access, name, R_OK, NULL); return (r == 0); } @@ -436,9 +628,8 @@ bool os_file_is_readable(const char *name) int os_file_is_writable(const char *name) FUNC_ATTR_NONNULL_ALL FUNC_ATTR_WARN_UNUSED_RESULT { - uv_fs_t req; - int r = uv_fs_access(&fs_loop, &req, name, W_OK, NULL); - uv_fs_req_cleanup(&req); + int r; + RUN_UV_FS_FUNC(r, uv_fs_access, name, W_OK, NULL); if (r == 0) { return os_isdir((char_u *)name) ? 2 : 1; } @@ -451,16 +642,10 @@ int os_file_is_writable(const char *name) int os_rename(const char_u *path, const char_u *new_path) FUNC_ATTR_NONNULL_ALL { - uv_fs_t request; - int result = uv_fs_rename(&fs_loop, &request, - (const char *)path, (const char *)new_path, NULL); - uv_fs_req_cleanup(&request); - - if (result == kLibuvSuccess) { - return OK; - } - - return FAIL; + int r; + RUN_UV_FS_FUNC(r, uv_fs_rename, (const char *)path, (const char *)new_path, + NULL); + return (r == kLibuvSuccess ? OK : FAIL); } /// Make a directory. @@ -469,10 +654,9 @@ int os_rename(const char_u *path, const char_u *new_path) int os_mkdir(const char *path, int32_t mode) FUNC_ATTR_NONNULL_ALL { - uv_fs_t request; - int result = uv_fs_mkdir(&fs_loop, &request, path, mode, NULL); - uv_fs_req_cleanup(&request); - return result; + int r; + RUN_UV_FS_FUNC(r, uv_fs_mkdir, path, mode, NULL); + return r; } /// Make a directory, with higher levels when needed @@ -554,10 +738,9 @@ int os_mkdtemp(const char *template, char *path) int os_rmdir(const char *path) FUNC_ATTR_NONNULL_ALL { - uv_fs_t request; - int result = uv_fs_rmdir(&fs_loop, &request, path, NULL); - uv_fs_req_cleanup(&request); - return result; + int r; + RUN_UV_FS_FUNC(r, uv_fs_rmdir, path, NULL); + return r; } /// Opens a directory. @@ -599,10 +782,9 @@ void os_closedir(Directory *dir) int os_remove(const char *path) FUNC_ATTR_NONNULL_ALL { - uv_fs_t request; - int result = uv_fs_unlink(&fs_loop, &request, path, NULL); - uv_fs_req_cleanup(&request); - return result; + int r; + RUN_UV_FS_FUNC(r, uv_fs_unlink, path, NULL); + return r; } /// Get the file information for a given path |