Zvfs improve libc file and int fd abstraction v2 #90916
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Previously, there was an implicit assumption that Zephyr's internal struct fd_entry * was synonymous with FILE * from the C library. This is generally not the case and aliasing these two distinct types was preventing a fair bit of functionality from Just Working - namely stdio function calls like fgets() and fopen(). The problem count be seen directly when trying to use a function like zvfs_fdopen(). Instead of aliasing the two types, require that all Zephyr C libraries provide 1. FILE *z_libc_file_alloc(int fd, const char *mode) Allocate and populate the required fields of a FILE object 2. int z_libc_file_get_fd(FILE *fp) Convert a FILE* object to an integer file descriptor. For Picolibc and Newlib-based C libraries, these functions set and get the integer file descriptor from a field of the internal FILE object representation. For the minimal C library, these functions convert between array index and struct fd_entry pointers. Signed-off-by: Chris Friedt <[email protected]>
Add a testsuite for the POSIX_DEVICE_IO Option Group. Signed-off-by: Chris Friedt <[email protected]>
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