static int vfs_semihost_open(void* ctx, const char * path, int flags, int mode)
{
int fd = -1, host_err = 0;
char *host_path;
vfs_semihost_ctx_t *semi_ctx = ctx;
ESP_LOGV(TAG, "%s: %p '%s 0x%x 0x%x'", __func__, semi_ctx, path, flags, mode);
if (ctx_uses_abspath(semi_ctx)) {
flags |= ESP_O_SEMIHOST_ABSPATH;
host_path = malloc(strlen(semi_ctx->host_path)+strlen(path)+1);
if(host_path == NULL) {
errno = ENOMEM;
return -1;
}
strcpy(host_path, semi_ctx->host_path);
strcat(host_path, path);
} else {
host_path = (char *)path;
}
fd = generic_syscall(SYS_OPEN, (int)host_path, strlen(host_path), flags, mode, &host_err);
if (ctx_uses_abspath(semi_ctx)) {
free(host_path);
}
if (fd == -1) {
errno = host_err;
}
return fd;
}
static off_t vfs_semihost_lseek(void* ctx, int fd, off_t size, int mode)
{
int ret = -1, host_err = 0;
ESP_LOGV(TAG, "%s: %d %ld %d", __func__, fd, size, mode);
ret = generic_syscall(SYS_SEEK, fd, size, mode, 0, &host_err);
if (ret == -1) {
errno = host_err;
}
return (off_t)ret;
}
static int vfs_semihost_close(void* ctx, int fd)
{
int ret = -1, host_err = 0;
ESP_LOGV(TAG, "%s: %d", __func__, fd);
ret = generic_syscall(SYS_CLOSE, fd, 0, 0, 0, &host_err);
if (ret == -1) {
errno = host_err;
}
return ret;
}
static ssize_t vfs_semihost_read(void* ctx, int fd, void* data, size_t size)
{
int host_err = 0;
size_t ret = -1;
ESP_LOGV(TAG, "%s: %d %u bytes", __func__, fd, size);
ret = generic_syscall(SYS_READ, fd, (int)data, size, 0, &host_err);
if (ret == -1) {
errno = host_err;
}
return (ssize_t)ret;
}
int my_fork()
{
/* implement fork using generic_syscall function */
return generic_syscall(2);
assert(0);
}
int my_getppid()
{
/* implement getppid using generic_syscall function */
return generic_syscall(64);
assert(0);
}
int my_getppid(void){
return generic_syscall(64);
}
int my_getpid(void){
return generic_syscall(20);
}
int my_fork(void){
return generic_syscall(2);
}
