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SourceVuESP-IDF Framework and ExamplesESP-IDFesp_vfs_pwrite()

esp_vfs_pwrite() function

Implements the VFS layer of POSIX pwrite()

Syntax

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Summary

Declaration

Definition

from esp_vfs.h:468

ssize_t esp_vfs_pwrite(int fd, const void *src, size_t size, off_t offset);

Implemented in vfs.c:989

Arguments

Argument

Description

File descriptor used for write

src

Pointer to the buffer from where the output will be read

size

Number of bytes to write

offset

Starting offset of the write

Return value

A positive return value indicates the number of bytes written. -1 is return on failure and errno is set accordingly.

References

Code

Location

ssize_t esp_vfs_pwrite(int fd, const void *src, size_t size, off_t offset)

vfs.c:989

ssize_t esp_vfs_pwrite(int fd, const void *src, size_t size, off_t offset);

esp_vfs.h:468

Call Tree

esp_vfs_pwrite() calls 5 functions:

esp_vfs_pwrite()

__getreent()

esp_vfs_fs_ops_t::::pwrite_p

esp_vfs_fs_ops_t::::pwrite

get_vfs_for_fd()

get_local_fd()

Data Use

esp_vfs_pwrite() reads 4 variables:

esp_vfs_fs_ops_t::::pwrite

vfs_entry_::flags

vfs_entry_::vfs

vfs_entry_::ctx

esp_vfs_pwrite()

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